Showing posts with label Example program. Show all posts
class Factorial
{
int fact(int n)
int fact(int n)
{
int result;
if(n==1) return 1;
result = fact(n-1) * n;
return result;
}
}
int result;
if(n==1) return 1;
result = fact(n-1) * n;
return result;
}
}
class Recursion
{
public static void main(String args[])
public static void main(String args[])
{
Factorial f = new Factorial();
System.out.println("Factorial of 4 is " + f.fact(4));
}
}
Factorial f = new Factorial();
System.out.println("Factorial of 4 is " + f.fact(4));
}
}
Output:
Factorial of 4 is 24
class ContinueLabel
{
public static void main(String args[])
public static void main(String args[])
{
outer: for (int i=0; i<10; i++)
outer: for (int i=0; i<10; i++)
{
for(int j=0; j<10; j++)
for(int j=0; j<10; j++)
{
if(j > i)
if(j > i)
{
System.out.println();
continue outer;
}
System.out.print(" " + (i * j));
}
}
System.out.println();
}
}
System.out.println();
continue outer;
}
System.out.print(" " + (i * j));
}
}
System.out.println();
}
}
Output:
class Continue
{
public static void main(String args[])
public static void main(String args[])
{
for(int i=0; i<10; i++)
for(int i=0; i<10; i++)
{
System.out.print(i + " ");
if (i%2 == 0) continue;
System.out.println("");
}
}
}
System.out.print(i + " ");
if (i%2 == 0) continue;
System.out.println("");
}
}
}
Output:
class arithmetic
{
public static void main(String args[])
{
short x = 8;
int y = 2;
float a = 10.5f;
float b = 6f;
System.out.println("Addition: "+(x+y));
System.out.println("Subtraction: "+(x-y));
System.out.println("Multiplication: "+(x*y));
System.out.println("Division: "+(x/y));
System.out.println("Modulus: "+(x%y));
System.out.println("Floating point Division: "+(a/b));
}
}
{
public static void main(String args[])
{
short x = 8;
int y = 2;
float a = 10.5f;
float b = 6f;
System.out.println("Addition: "+(x+y));
System.out.println("Subtraction: "+(x-y));
System.out.println("Multiplication: "+(x*y));
System.out.println("Division: "+(x/y));
System.out.println("Modulus: "+(x%y));
System.out.println("Floating point Division: "+(a/b));
}
}
Output:
Addition: 10
Subtraction: 6
Multiplication: 16
Division: 4
Modulus: 0
Floating point Division: 1.75
Subtraction: 6
Multiplication: 16
Division: 4
Modulus: 0
Floating point Division: 1.75
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class palindrome
{
public static void main(String[] args)
{
try
{
System.out.print("Enter a number: ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String num=br.readLine();
int no=Integer.parseInt(num);
int temp=no;
int digit=0,ld;
while(no!=0)
{
ld=no%10;
digit=digit*10+ld;
no=no/10;
}
if(temp==digit)
{
System.out.println("Palindrome number");
}
else
{
System.out.println("Not a palindrome number");
}
}
catch (IOException | NumberFormatException ex)
{
}
}
}
import java.io.IOException;
import java.io.InputStreamReader;
class palindrome
{
public static void main(String[] args)
{
try
{
System.out.print("Enter a number: ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String num=br.readLine();
int no=Integer.parseInt(num);
int temp=no;
int digit=0,ld;
while(no!=0)
{
ld=no%10;
digit=digit*10+ld;
no=no/10;
}
if(temp==digit)
{
System.out.println("Palindrome number");
}
else
{
System.out.println("Not a palindrome number");
}
}
catch (IOException | NumberFormatException ex)
{
}
}
}
Output:
Enter a number: 123
Not a palindrome number
Not a palindrome number
Enter a number: 12321
Palindrome number
Palindrome number
import java.io.InputStreamReader;
class Reverse
{
public static void main(String[] args)
{
try
{
System.out.print("Enter string : ");
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
String str=in.readLine();
for(int i=str.length()-1;i>=0;i--)
{
System.out.print(str.charAt(i));
}
}
catch (Exception ex)
{
}
}
}
Output:
Enter string : VIJAY
YAJIV
import java.util.Scanner;
class fibonacci
{
public static void main(String[] args)
{
System.out.print("Enter the number to display fibonicci series: ");
Scanner in=new Scanner(System.in);
int num=in.nextInt();
int a=0,b=1,c=0,i=0;
while(i!=num)
{
System.out.println(c);
a=b;
b=c;
c=a+b;
i++;
}
}
}
class fibonacci
{
public static void main(String[] args)
{
System.out.print("Enter the number to display fibonicci series: ");
Scanner in=new Scanner(System.in);
int num=in.nextInt();
int a=0,b=1,c=0,i=0;
while(i!=num)
{
System.out.println(c);
a=b;
b=c;
c=a+b;
i++;
}
}
}
Output:
import java.util.Scanner;
class solutions
{
public static void main(String[] args)
{
int a,b,c;
double x,y;
Scanner s=new Scanner(System.in);
System.out.println("Enter the values of a, b, c:");
a=s.nextInt();
b=s.nextInt();
c=s.nextInt();
int k=(b*b)-4*a*c;
if(k<0)
{
System.out.println("No real roots");
}
else
{
double l=Math.sqrt(k);
x=(-b-l)/2*a;
y=(-b+l)/2*a;
System.out.println("Roots of given equation:"+x+"
"+y);
}
}
}
Output:
Enter the values of a, b, c:
5
5
2
No real roots
5
5
2
No real roots
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class TransparencyDemo extends JPanel
import javax.swing.*;
import javax.swing.event.*;
public class TransparencyDemo extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("TransparencyDemo");
TransparencyDemo content = new TransparencyDemo();
window.setContentPane(content);
window.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
private JSlider triangleTransparency;
private JSlider ovalTransparency;
private JSlider rectangleTransparency;
private JSlider textTransparency;
private Font textFont = new Font("Serif",Font.BOLD,42);
private JPanel display = new JPanel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Color triangleColor = new Color(255,0,0,triangleTransparency.getValue());
Color ovalColor = new Color(0,255,0,ovalTransparency.getValue());
Color rectangleColor = new Color(0,0,255,rectangleTransparency.getValue());
Color textColor = new Color(0,0,0,textTransparency.getValue());
g.setColor(triangleColor);
g.fillPolygon(new int[] { scaleX(0.25), scaleX(0.7), scaleX(0.1) },
new int[] { scaleY(0.1), scaleY(0.7), scaleY(0.7) },
3);
g.setColor(ovalColor);
g.fillOval(scaleX(0.3),scaleY(0.45),getWidth()/2,getHeight()/2);
g.setColor(rectangleColor);
g.fillRect(scaleX(0.4),scaleY(0.15),getWidth()/2,getHeight()/2);
FontMetrics metrics = g.getFontMetrics(textFont);
int lineWidth1 = metrics.stringWidth("Transparency");
int lineWidth2 = metrics.stringWidth("Demo");
int textHeight = metrics.getHeight() + metrics.getAscent();
int topSkip = (getHeight() - textHeight) / 2;
int leftSkip1 = (getWidth() - lineWidth1) / 2;
int leftSkip2 = (getWidth() - lineWidth2) / 2;
g.setColor(textColor);
g.setFont(textFont);
g.drawString("Transparency", leftSkip1, topSkip + metrics.getAscent());
g.drawString("Demo", leftSkip2, topSkip + metrics.getAscent() + metrics.getHeight());
}
private int scaleX(double x) {
return (int)(x * getWidth());
}
private int scaleY(double y) {
return (int)(y * getHeight());
}
};
private ChangeListener listener = new ChangeListener() {
public void stateChanged(ChangeEvent arg0) {
display.repaint();
}
};
public TransparencyDemo() {
setLayout(new BorderLayout(3,3));
setBorder(BorderFactory.createLineBorder(Color.GRAY,2));
setBackground(Color.GRAY);
display.setBackground(Color.WHITE);
display.setPreferredSize(new Dimension(400,300));
add(display,BorderLayout.CENTER);
JPanel bottom = new JPanel();
bottom.setLayout(new GridLayout(4,2,3,3));
add(bottom,BorderLayout.SOUTH);
bottom.add( new JLabel(" Triangle Transparency:") );
triangleTransparency = new JSlider(0,255);
triangleTransparency.addChangeListener(listener);
bottom.add( triangleTransparency );
bottom.add( new JLabel(" Oval Transparency:") );
ovalTransparency = new JSlider(0,255);
ovalTransparency.addChangeListener(listener);
bottom.add( ovalTransparency );
bottom.add( new JLabel(" Rectangle Transparency:") );
rectangleTransparency = new JSlider(0,255);
rectangleTransparency.addChangeListener(listener);
bottom.add( rectangleTransparency );
bottom.add( new JLabel(" Text Transparency:") );
textTransparency = new JSlider(0,255);
textTransparency.addChangeListener(listener);
bottom.add( textTransparency );
}
}
JFrame window = new JFrame("TransparencyDemo");
TransparencyDemo content = new TransparencyDemo();
window.setContentPane(content);
window.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
private JSlider triangleTransparency;
private JSlider ovalTransparency;
private JSlider rectangleTransparency;
private JSlider textTransparency;
private Font textFont = new Font("Serif",Font.BOLD,42);
private JPanel display = new JPanel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Color triangleColor = new Color(255,0,0,triangleTransparency.getValue());
Color ovalColor = new Color(0,255,0,ovalTransparency.getValue());
Color rectangleColor = new Color(0,0,255,rectangleTransparency.getValue());
Color textColor = new Color(0,0,0,textTransparency.getValue());
g.setColor(triangleColor);
g.fillPolygon(new int[] { scaleX(0.25), scaleX(0.7), scaleX(0.1) },
new int[] { scaleY(0.1), scaleY(0.7), scaleY(0.7) },
3);
g.setColor(ovalColor);
g.fillOval(scaleX(0.3),scaleY(0.45),getWidth()/2,getHeight()/2);
g.setColor(rectangleColor);
g.fillRect(scaleX(0.4),scaleY(0.15),getWidth()/2,getHeight()/2);
FontMetrics metrics = g.getFontMetrics(textFont);
int lineWidth1 = metrics.stringWidth("Transparency");
int lineWidth2 = metrics.stringWidth("Demo");
int textHeight = metrics.getHeight() + metrics.getAscent();
int topSkip = (getHeight() - textHeight) / 2;
int leftSkip1 = (getWidth() - lineWidth1) / 2;
int leftSkip2 = (getWidth() - lineWidth2) / 2;
g.setColor(textColor);
g.setFont(textFont);
g.drawString("Transparency", leftSkip1, topSkip + metrics.getAscent());
g.drawString("Demo", leftSkip2, topSkip + metrics.getAscent() + metrics.getHeight());
}
private int scaleX(double x) {
return (int)(x * getWidth());
}
private int scaleY(double y) {
return (int)(y * getHeight());
}
};
private ChangeListener listener = new ChangeListener() {
public void stateChanged(ChangeEvent arg0) {
display.repaint();
}
};
public TransparencyDemo() {
setLayout(new BorderLayout(3,3));
setBorder(BorderFactory.createLineBorder(Color.GRAY,2));
setBackground(Color.GRAY);
display.setBackground(Color.WHITE);
display.setPreferredSize(new Dimension(400,300));
add(display,BorderLayout.CENTER);
JPanel bottom = new JPanel();
bottom.setLayout(new GridLayout(4,2,3,3));
add(bottom,BorderLayout.SOUTH);
bottom.add( new JLabel(" Triangle Transparency:") );
triangleTransparency = new JSlider(0,255);
triangleTransparency.addChangeListener(listener);
bottom.add( triangleTransparency );
bottom.add( new JLabel(" Oval Transparency:") );
ovalTransparency = new JSlider(0,255);
ovalTransparency.addChangeListener(listener);
bottom.add( ovalTransparency );
bottom.add( new JLabel(" Rectangle Transparency:") );
rectangleTransparency = new JSlider(0,255);
rectangleTransparency.addChangeListener(listener);
bottom.add( rectangleTransparency );
bottom.add( new JLabel(" Text Transparency:") );
textTransparency = new JSlider(0,255);
textTransparency.addChangeListener(listener);
bottom.add( textTransparency );
}
}
Output:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class StrokeDemo extends JPanel
import java.awt.event.*;
import javax.swing.*;
public class StrokeDemo extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("Click and Drag; Right-click for Rectangles");
StrokeDemo content = new StrokeDemo();
window.setContentPane(content);
window.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
JFrame window = new JFrame("Click and Drag; Right-click for Rectangles");
StrokeDemo content = new StrokeDemo();
window.setContentPane(content);
window.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
private class Display extends JPanel
{
Stroke stroke; // The stroke used for drawing in this panel.
boolean antialiased; // Should antialiasing be used?
boolean drawLine = true; // Should a line be drawn, or a rectangle?
int x1, y1, x2, y2; // Endpoints of line or corners of rectangle.
Display(Stroke s, boolean a)
Stroke stroke; // The stroke used for drawing in this panel.
boolean antialiased; // Should antialiasing be used?
boolean drawLine = true; // Should a line be drawn, or a rectangle?
int x1, y1, x2, y2; // Endpoints of line or corners of rectangle.
Display(Stroke s, boolean a)
{
stroke = s;
antialiased = a;
x1 = y1 = 15;
x2 = 80;
y2 = 85;
setPreferredSize(new Dimension(100,100));
setBackground(Color.WHITE);
}
public void paintComponent(Graphics g)
stroke = s;
antialiased = a;
x1 = y1 = 15;
x2 = 80;
y2 = 85;
setPreferredSize(new Dimension(100,100));
setBackground(Color.WHITE);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setStroke(stroke);
if (antialiased)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setStroke(stroke);
if (antialiased)
{
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
if (drawLine)
g2.drawLine(x1,y1,x2,y2);
else
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
if (drawLine)
g2.drawLine(x1,y1,x2,y2);
else
{
int a = Math.min(x1,x2);
int b = Math.min(y1,y2);
int w = Math.abs(x1 - x2);
int h = Math.abs(y1 - y2);
g2.drawRect(a,b,w,h);
}
}
}
private class MouseHandler implements MouseListener, MouseMotionListener
int a = Math.min(x1,x2);
int b = Math.min(y1,y2);
int w = Math.abs(x1 - x2);
int h = Math.abs(y1 - y2);
g2.drawRect(a,b,w,h);
}
}
}
private class MouseHandler implements MouseListener, MouseMotionListener
{
public void mousePressed(MouseEvent e)
public void mousePressed(MouseEvent e)
{
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
{
displays[i][j].x1 = e.getX();
displays[i][j].x2 = e.getX();
displays[i][j].y1 = e.getY();
displays[i][j].y2 = e.getY();
displays[i][j].drawLine = ! e.isMetaDown();
displays[i][j].repaint();
}
}
public void mouseDragged(MouseEvent e)
displays[i][j].x1 = e.getX();
displays[i][j].x2 = e.getX();
displays[i][j].y1 = e.getY();
displays[i][j].y2 = e.getY();
displays[i][j].drawLine = ! e.isMetaDown();
displays[i][j].repaint();
}
}
public void mouseDragged(MouseEvent e)
{
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
{
displays[i][j].x2 = e.getX();
displays[i][j].y2 = e.getY();
displays[i][j].repaint();
}
}
public void mouseReleased(MouseEvent e) { }
public void mouseMoved(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
}
displays[i][j].x2 = e.getX();
displays[i][j].y2 = e.getY();
displays[i][j].repaint();
}
}
public void mouseReleased(MouseEvent e) { }
public void mouseMoved(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
}
private Display[][] displays = new Display[5][3];
public StrokeDemo()
{
setLayout(new GridLayout(3,5,3,3));
setBorder(BorderFactory.createLineBorder(Color.GRAY,3));
setBackground(Color.GRAY);
displays[0][0] = new Display(new BasicStroke(1), false);
displays[1][0] = new Display(new BasicStroke(2), false);
displays[2][0] = new Display(new BasicStroke(5), false);
displays[3][0] = new Display(new BasicStroke(10), false);
displays[4][0] = new Display(new BasicStroke(20), false);
displays[0][1] = new Display(new BasicStroke(1,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[1][1] = new Display(new BasicStroke(2,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[2][1] = new Display(new BasicStroke(5,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[3][1] = new Display(new BasicStroke(10,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[4][1] = new Display(new BasicStroke(20,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[0][2] = new Display(new BasicStroke(1, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[1][2] = new Display(new BasicStroke(2, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[2][2] = new Display(new BasicStroke(5, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[3][2] = new Display(new BasicStroke(10, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[4][2] = new Display(new BasicStroke(20, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
MouseHandler listener = new MouseHandler();
for (int row = 0; row < 3; row++)
for (int col = 0; col < 5; col++)
setLayout(new GridLayout(3,5,3,3));
setBorder(BorderFactory.createLineBorder(Color.GRAY,3));
setBackground(Color.GRAY);
displays[0][0] = new Display(new BasicStroke(1), false);
displays[1][0] = new Display(new BasicStroke(2), false);
displays[2][0] = new Display(new BasicStroke(5), false);
displays[3][0] = new Display(new BasicStroke(10), false);
displays[4][0] = new Display(new BasicStroke(20), false);
displays[0][1] = new Display(new BasicStroke(1,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[1][1] = new Display(new BasicStroke(2,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[2][1] = new Display(new BasicStroke(5,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[3][1] = new Display(new BasicStroke(10,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[4][1] = new Display(new BasicStroke(20,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[0][2] = new Display(new BasicStroke(1, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[1][2] = new Display(new BasicStroke(2, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[2][2] = new Display(new BasicStroke(5, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[3][2] = new Display(new BasicStroke(10, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[4][2] = new Display(new BasicStroke(20, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
MouseHandler listener = new MouseHandler();
for (int row = 0; row < 3; row++)
for (int col = 0; col < 5; col++)
{
add(displays[col][row]);
displays[col][row].addMouseListener(listener);
displays[col][row].addMouseMotionListener(listener);
}
}
}
add(displays[col][row]);
displays[col][row].addMouseListener(listener);
displays[col][row].addMouseMotionListener(listener);
}
}
}
Output:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class StatesAndCapitalsTableDemo extends JPanel
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class StatesAndCapitalsTableDemo extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("Trivial Table Demo");
StatesAndCapitalsTableDemo content = new StatesAndCapitalsTableDemo();
window.setContentPane(content);
window.setSize( new Dimension(350,300) );
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
JFrame window = new JFrame("Trivial Table Demo");
StatesAndCapitalsTableDemo content = new StatesAndCapitalsTableDemo();
window.setContentPane(content);
window.setSize( new Dimension(350,300) );
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
public StatesAndCapitalsTableDemo()
{
String[] columnHeads = new String[] { "State", "Capital City" };
JTable table = new JTable(statesAndCapitals, columnHeads);
setLayout(new BorderLayout());
add( new JScrollPane(table), BorderLayout.CENTER );
}
String[] columnHeads = new String[] { "State", "Capital City" };
JTable table = new JTable(statesAndCapitals, columnHeads);
setLayout(new BorderLayout());
add( new JScrollPane(table), BorderLayout.CENTER );
}
private static String[][] statesAndCapitals = new String[][]
{
{ "Alabama", "Montgomery" },
{ "Alaska", "Juneau" },
{ "Arizona", "Phoenix" },
{ "Arkansas", "Little Rock" },
{ "California", "Sacramento" },
{ "Colorado", "Denver" },
{ "Connecticut", "Hartford" },
{ "Delaware", "Dover" },
{ "Florida", "Tallahassee" },
{ "Georgia", "Atlanta" },
{ "Hawaii", "Honolulu" },
{ "Idaho", "Boise" },
{ "Illinois", "Springfield" },
{ "Indiana", "Indianapolis" },
{ "Iowa", "Des Moines" },
{ "Kansas", "Topeka" },
{ "Kentucky", "Frankfort" },
{ "Louisiana", "Baton Rouge" },
{ "Maine", "Augusta" },
{ "Maryland", "Annapolis" },
{ "Massachusetts", "Boston" },
{ "Michigan", "Lansing" },
{ "Minnesota", "St. Paul" },
{ "Mississippi", "Jackson" },
{ "Missouri", "Jefferson City" },
{ "Montana", "Helena" },
{ "Nebraska", "Lincoln" },
{ "Nevada", "Carson City" },
{ "New Hampshire", "Concord" },
{ "New Jersey", "Trenton" },
{ "New Mexico", "Santa Fe" },
{ "New York", "Albany" },
{ "North Carolina", "Raleigh" },
{ "North Dakota", "Bismarck" },
{ "Ohio", "Columbus" },
{ "Oklahoma", "Oklahoma City" },
{ "Oregon", "Salem" },
{ "Pennsylvania", "Harrisburg" },
{ "Rhode Island", "Providence" },
{ "South Carolina", "Columbia" },
{ "South Dakota", "Pierre" },
{ "Tennessee", "Nashville" },
{ "Texas", "Austin" },
{ "Utah", "Salt Lake City" },
{ "Vermont", "Montpelier" },
{ "Virginia", "Richmond" },
{ "Washington", "Olympia" },
{ "West Virginia", "Charleston" },
{ "Wisconsin", "Madison" },
{ "Wyoming", "Cheyenne" }
};
}
{ "Alabama", "Montgomery" },
{ "Alaska", "Juneau" },
{ "Arizona", "Phoenix" },
{ "Arkansas", "Little Rock" },
{ "California", "Sacramento" },
{ "Colorado", "Denver" },
{ "Connecticut", "Hartford" },
{ "Delaware", "Dover" },
{ "Florida", "Tallahassee" },
{ "Georgia", "Atlanta" },
{ "Hawaii", "Honolulu" },
{ "Idaho", "Boise" },
{ "Illinois", "Springfield" },
{ "Indiana", "Indianapolis" },
{ "Iowa", "Des Moines" },
{ "Kansas", "Topeka" },
{ "Kentucky", "Frankfort" },
{ "Louisiana", "Baton Rouge" },
{ "Maine", "Augusta" },
{ "Maryland", "Annapolis" },
{ "Massachusetts", "Boston" },
{ "Michigan", "Lansing" },
{ "Minnesota", "St. Paul" },
{ "Mississippi", "Jackson" },
{ "Missouri", "Jefferson City" },
{ "Montana", "Helena" },
{ "Nebraska", "Lincoln" },
{ "Nevada", "Carson City" },
{ "New Hampshire", "Concord" },
{ "New Jersey", "Trenton" },
{ "New Mexico", "Santa Fe" },
{ "New York", "Albany" },
{ "North Carolina", "Raleigh" },
{ "North Dakota", "Bismarck" },
{ "Ohio", "Columbus" },
{ "Oklahoma", "Oklahoma City" },
{ "Oregon", "Salem" },
{ "Pennsylvania", "Harrisburg" },
{ "Rhode Island", "Providence" },
{ "South Carolina", "Columbia" },
{ "South Dakota", "Pierre" },
{ "Tennessee", "Nashville" },
{ "Texas", "Austin" },
{ "Utah", "Salt Lake City" },
{ "Vermont", "Montpelier" },
{ "Virginia", "Richmond" },
{ "Washington", "Olympia" },
{ "West Virginia", "Charleston" },
{ "Wisconsin", "Madison" },
{ "Wyoming", "Cheyenne" }
};
}
Output:
import javax.swing.*;
public class SimpleJLabelExample
public class SimpleJLabelExample
{
public static void main(String[] args)
public static void main(String[] args)
{
JLabel label = new JLabel("A Very Simple Text Label");
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(label); // adds to CENTER
frame.pack();
frame.setVisible(true);
}
}
JLabel label = new JLabel("A Very Simple Text Label");
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(label); // adds to CENTER
frame.pack();
frame.setVisible(true);
}
}
Output:
import javax.swing.*;
import java.awt.*;
public class MnemonicLabels
import java.awt.*;
public class MnemonicLabels
{
public static void main(String[] args)
public static void main(String[] args)
{
JTextField firstField = new JTextField(10);
JTextField middleField = new JTextField(10);
JTextField lastField = new JTextField(10);
// Create labels and mnemonics
JLabel firstLabel = new JLabel("First Name", JLabel.RIGHT);
firstLabel.setDisplayedMnemonic('F');
firstLabel.setLabelFor(firstField);
JLabel middleLabel = new JLabel("Middle Initial", JLabel.RIGHT);
middleLabel.setDisplayedMnemonic('I');
middleLabel.setDisplayedMnemonicIndex(7); // requires 1.4
middleLabel.setLabelFor(middleField);
JLabel lastLabel = new JLabel("Last Name", JLabel.RIGHT);
lastLabel.setDisplayedMnemonic('L');
lastLabel.setLabelFor(lastField);
// Layout and Display
JPanel p = new JPanel();
p.setLayout(new GridLayout(3, 2, 5, 5));
p.add(firstLabel);
p.add(firstField);
p.add(middleLabel);
p.add(middleField);
p.add(lastLabel);
p.add(lastField);
JFrame f = new JFrame("MnemonicLabels");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(p);
f.pack();
f.setVisible(true);
}
}
JTextField firstField = new JTextField(10);
JTextField middleField = new JTextField(10);
JTextField lastField = new JTextField(10);
// Create labels and mnemonics
JLabel firstLabel = new JLabel("First Name", JLabel.RIGHT);
firstLabel.setDisplayedMnemonic('F');
firstLabel.setLabelFor(firstField);
JLabel middleLabel = new JLabel("Middle Initial", JLabel.RIGHT);
middleLabel.setDisplayedMnemonic('I');
middleLabel.setDisplayedMnemonicIndex(7); // requires 1.4
middleLabel.setLabelFor(middleField);
JLabel lastLabel = new JLabel("Last Name", JLabel.RIGHT);
lastLabel.setDisplayedMnemonic('L');
lastLabel.setLabelFor(lastField);
// Layout and Display
JPanel p = new JPanel();
p.setLayout(new GridLayout(3, 2, 5, 5));
p.add(firstLabel);
p.add(firstField);
p.add(middleLabel);
p.add(middleField);
p.add(lastLabel);
p.add(lastField);
JFrame f = new JFrame("MnemonicLabels");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(p);
f.pack();
f.setVisible(true);
}
}
Output:
import javax.swing.*;
public class HtmlLabel extends JPanel {
public static final String markup = "<html>line 1<p><font color=blue size=+2>"
+ "big blue</font> line 2<p>line 3</html>";
public static void main(String argv[]) {
JPanel p = new JPanel(new java.awt.GridLayout(0, 1));
p.add(new JLabel(markup));
p.add(new java.awt.Label(markup));
JFrame f = new JFrame("HtmlLabel");
f.setContentPane(p);
f.setSize(600, 200);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
public class HtmlLabel extends JPanel {
public static final String markup = "<html>line 1<p><font color=blue size=+2>"
+ "big blue</font> line 2<p>line 3</html>";
public static void main(String argv[]) {
JPanel p = new JPanel(new java.awt.GridLayout(0, 1));
p.add(new JLabel(markup));
p.add(new java.awt.Label(markup));
JFrame f = new JFrame("HtmlLabel");
f.setContentPane(p);
f.setSize(600, 200);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
Output:
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
public class DynamicIconExample {
public static void main(String[] args) {
final JSlider width = new JSlider(JSlider.HORIZONTAL, 1, 150, 75);
final JSlider height = new JSlider(JSlider.VERTICAL, 1, 150, 75);
class DynamicIcon implements Icon {
public int getIconWidth() { return width.getValue(); }
public int getIconHeight() { return height.getValue(); }
public void paintIcon(Component c, Graphics g, int x, int y) {
g.fill3DRect(x, y, getIconWidth(), getIconHeight(), true);
}
};
Icon icon = new DynamicIcon();
final JLabel dynamicLabel = new JLabel(icon);
class Updater implements ChangeListener {
public void stateChanged(ChangeEvent ev) {
dynamicLabel.repaint();
}
};
Updater updater = new Updater();
width.addChangeListener(updater);
height.addChangeListener(updater);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = f.getContentPane();
c.setLayout(new BorderLayout());
c.add(width, BorderLayout.NORTH);
c.add(height, BorderLayout.WEST);
c.add(dynamicLabel, BorderLayout.CENTER);
f.setSize(210,210);
f.setVisible(true);
}
}
import javax.swing.event.*;
import java.awt.*;
public class DynamicIconExample {
public static void main(String[] args) {
final JSlider width = new JSlider(JSlider.HORIZONTAL, 1, 150, 75);
final JSlider height = new JSlider(JSlider.VERTICAL, 1, 150, 75);
class DynamicIcon implements Icon {
public int getIconWidth() { return width.getValue(); }
public int getIconHeight() { return height.getValue(); }
public void paintIcon(Component c, Graphics g, int x, int y) {
g.fill3DRect(x, y, getIconWidth(), getIconHeight(), true);
}
};
Icon icon = new DynamicIcon();
final JLabel dynamicLabel = new JLabel(icon);
class Updater implements ChangeListener {
public void stateChanged(ChangeEvent ev) {
dynamicLabel.repaint();
}
};
Updater updater = new Updater();
width.addChangeListener(updater);
height.addChangeListener(updater);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = f.getContentPane();
c.setLayout(new BorderLayout());
c.add(width, BorderLayout.NORTH);
c.add(height, BorderLayout.WEST);
c.add(dynamicLabel, BorderLayout.CENTER);
f.setSize(210,210);
f.setVisible(true);
}
}
Output:
import java.awt.*;
import javax.swing.*;
public class AlignmentExample
import javax.swing.*;
public class AlignmentExample
{
public static void main(String[] args)
public static void main(String[] args)
{
JLabel label1 = new JLabel("BottomRight", SwingConstants.RIGHT);
JLabel label2 = new JLabel("CenterLeft", SwingConstants.LEFT);
JLabel label3 = new JLabel("TopCenter", SwingConstants.CENTER);
label1.setVerticalAlignment(SwingConstants.BOTTOM);
label2.setVerticalAlignment(SwingConstants.CENTER);
label3.setVerticalAlignment(SwingConstants.TOP);
label1.setBorder(BorderFactory.createLineBorder(Color.black));
label2.setBorder(BorderFactory.createLineBorder(Color.black));
label3.setBorder(BorderFactory.createLineBorder(Color.black));
JFrame frame = new JFrame("AlignmentExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel(new GridLayout(3, 1, 8, 8));
p.add(label1);
p.add(label2);
p.add(label3);
p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
frame.setContentPane(p);
frame.setSize(200,200);
frame.setVisible(true);
}
}
JLabel label1 = new JLabel("BottomRight", SwingConstants.RIGHT);
JLabel label2 = new JLabel("CenterLeft", SwingConstants.LEFT);
JLabel label3 = new JLabel("TopCenter", SwingConstants.CENTER);
label1.setVerticalAlignment(SwingConstants.BOTTOM);
label2.setVerticalAlignment(SwingConstants.CENTER);
label3.setVerticalAlignment(SwingConstants.TOP);
label1.setBorder(BorderFactory.createLineBorder(Color.black));
label2.setBorder(BorderFactory.createLineBorder(Color.black));
label3.setBorder(BorderFactory.createLineBorder(Color.black));
JFrame frame = new JFrame("AlignmentExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel(new GridLayout(3, 1, 8, 8));
p.add(label1);
p.add(label2);
p.add(label3);
p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
frame.setContentPane(p);
frame.setSize(200,200);
frame.setVisible(true);
}
}
Output:
Reference:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class TextAreaDemo extends JPanel
import java.awt.Color;
import java.awt.Font;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class TextAreaDemo extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("Slider Demo");
TextAreaDemo content = new TextAreaDemo();
window.setContentPane(content);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLocation(120,70);
window.setSize(400,250);
window.setVisible(true);
}
public TextAreaDemo()
JFrame window = new JFrame("Slider Demo");
TextAreaDemo content = new TextAreaDemo();
window.setContentPane(content);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLocation(120,70);
window.setSize(400,250);
window.setVisible(true);
}
public TextAreaDemo()
{
String text = "So, naturalists observe, a flea\n"
+ "Has smaller fleas that on him prey;\n"
+ "And these have smaller still to bite 'em;\n"
+ "And so proceed ad infinitum.\n\n"
+ " --Jonathan Swift";
JTextArea textArea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(textArea);
textArea.setText(text);
textArea.setFont( new Font("Serif", Font.PLAIN, 24 ));
textArea.setMargin( new Insets(7,7,7,7) );
setLayout(new BorderLayout());
setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
add(scrollPane, BorderLayout.CENTER);
}
}
String text = "So, naturalists observe, a flea\n"
+ "Has smaller fleas that on him prey;\n"
+ "And these have smaller still to bite 'em;\n"
+ "And so proceed ad infinitum.\n\n"
+ " --Jonathan Swift";
JTextArea textArea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(textArea);
textArea.setText(text);
textArea.setFont( new Font("Serif", Font.PLAIN, 24 ));
textArea.setMargin( new Insets(7,7,7,7) );
setLayout(new BorderLayout());
setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
add(scrollPane, BorderLayout.CENTER);
}
}
Output:
import java.util.Scanner;
public class ReverseInputNumbers
public class ReverseInputNumbers
{
public static void main(String[] args)
public static void main(String[] args)
{
Scanner input = new Scanner( System.in );
int[] numbers;
int count,num;
numbers = new int[100];
count = 0;
System.out.println("Enter up to 100 positive integers (or) enter 0 to end.");
while (true)
Scanner input = new Scanner( System.in );
int[] numbers;
int count,num;
numbers = new int[100];
count = 0;
System.out.println("Enter up to 100 positive integers (or) enter 0 to end.");
while (true)
{
System.out.print("? ");
num = input.nextInt();
if (num <= 0)
System.out.print("? ");
num = input.nextInt();
if (num <= 0)
{
break;
}
numbers[count] = num;
count++;
}
System.out.println("\nYour numbers in reverse order are:\n");
for (int i = count - 1; i >= 0; i--)
break;
}
numbers[count] = num;
count++;
}
System.out.println("\nYour numbers in reverse order are:\n");
for (int i = count - 1; i >= 0; i--)
{
System.out.println( numbers[i] );
}
}
}
System.out.println( numbers[i] );
}
}
}
Output:
Enter up to 100 positive integers (or) enter 0 to end.
? 54
? 45
? 451
? 21
? 32
? 65465
? 9779
? 0
Your numbers in reverse order are:
9779
65465
32
21
451
45
54
import java.util.Scanner;
class ComputeAverage
class ComputeAverage
{
public static void main(String[] args)
public static void main(String[] args)
{
Scanner input = new Scanner( System.in );
int inputNumber, sum=0, count=0;
double average;
System.out.print("Enter your first positive integer: ");
inputNumber = input.nextInt();
while (inputNumber != 0)
Scanner input = new Scanner( System.in );
int inputNumber, sum=0, count=0;
double average;
System.out.print("Enter your first positive integer: ");
inputNumber = input.nextInt();
while (inputNumber != 0)
{
sum += inputNumber;
count++;
System.out.print("Enter your next positive integer, or 0 to Stop: ");
inputNumber = input.nextInt();
}
if (count == 0)
sum += inputNumber;
count++;
System.out.print("Enter your next positive integer, or 0 to Stop: ");
inputNumber = input.nextInt();
}
if (count == 0)
{
System.out.println("You didn't enter any data!");
}
else
System.out.println("You didn't enter any data!");
}
else
{
average = ((double)sum) / count;
System.out.println();
System.out.println("You entered " + count + " positive integers.");
System.out.printf("Their average is %1.3f.\n", average);
}
}
}
average = ((double)sum) / count;
System.out.println();
System.out.println("You entered " + count + " positive integers.");
System.out.printf("Their average is %1.3f.\n", average);
}
}
}
Output:
Enter your first positive integer: 12
Enter your next positive integer, or 0 to Stop: 45
Enter your next positive integer, or 0 to Stop: 87
Enter your next positive integer, or 0 to Stop: 0
You entered 3 positive integers.
Their average is 48.000.
Enter your next positive integer, or 0 to Stop: 45
Enter your next positive integer, or 0 to Stop: 87
Enter your next positive integer, or 0 to Stop: 0
You entered 3 positive integers.
Their average is 48.000.
import java.util.Scanner;
class CountDivisors
class CountDivisors
{
public static void main(String[] args)
public static void main(String[] args)
{
Scanner input = new Scanner( System.in );
int N,testDivisor,divisorCount,numberTested;
while (true)
Scanner input = new Scanner( System.in );
int N,testDivisor,divisorCount,numberTested;
while (true)
{
System.out.print("Enter a positive integer: ");
N = input.nextInt();
if (N > 0)
break;
System.out.println("That number is not positive. Please try again.");
}
divisorCount = 0;
numberTested = 0;
for (testDivisor = 1; testDivisor <= N; testDivisor++)
System.out.print("Enter a positive integer: ");
N = input.nextInt();
if (N > 0)
break;
System.out.println("That number is not positive. Please try again.");
}
divisorCount = 0;
numberTested = 0;
for (testDivisor = 1; testDivisor <= N; testDivisor++)
{
if ( N % testDivisor == 0 )
divisorCount++;
numberTested++;
if (numberTested == 1000000)
if ( N % testDivisor == 0 )
divisorCount++;
numberTested++;
if (numberTested == 1000000)
{
System.out.print('.');
numberTested = 0;
}
}
System.out.println();
System.out.println("The number of divisors of " +N+ " is " + divisorCount);
}
}
System.out.print('.');
numberTested = 0;
}
}
System.out.println();
System.out.println("The number of divisors of " +N+ " is " + divisorCount);
}
}
Output:
Enter a positive integer: 5
The number of divisors of 5 is 2
The number of divisors of 5 is 2
