import javax.swing.*;
public class Java_1
{
//*********Found**********
public static void main(String[] args)
{
System.out.println();
System.out.println("这是一个指定球半径,求球体积的程序。");
String input=JOptionPane.showInputDialog("请输入球半径。");
//*********Found**********
double r=Double.parseDouble(input);
System.out.println("当球的半径是" + r + "时,该球的体积是 " + (Math.PI*r*r*r*4/3));
System.exit(0);
}
}
public class Java_2
{
public static void main(String[] args)
{
Thread t = new SimpleThread("Testing_Thread");
//*********Found**********
t.start() ;
}
}
//*********Found**********
class SimpleThread extends Thread
{
public SimpleThread(String str)
{
//*********Found**********
super(str) ;
}
//*********Found**********
public void run()
{
System.out.println("Running the " + getName() + ":");
for (int i = 0; i < 5; i++)
{
System.out.println("---" + i + "---" + getName());
try
{
sleep((int)(2 * 100));
}
//*********Found**********
catch(InterruptedException e) { }
}
}
}
import java.awt.event.*;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
public class Java_3
{
public static void main(String[] args)
{
FontFrame frame = new FontFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
//*********Found**********
class FontFrame extends JFrame
{
public FontFrame()
{
setTitle("北京 2008");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
FontPanel panel = new FontPanel();
Container contentPane = getContentPane();
//*********Found**********
contentPane.add(panel);
}
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 250;
}
class FontPanel extends JPanel
{
public FontPanel()
{
JButton yellowButton = new JButton("Yellow");
JButton blueButton = new JButton("Blue");
JButton redButton = new JButton("Green");
add(yellowButton);
add(blueButton);
add(redButton);
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction blueAction = new ColorAction(Color.BLUE);
ColorAction greenAction = new ColorAction(Color.GREEN);
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(blueAction);
redButton.addActionListener(greenAction);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
String message = "同一个世界,同一个梦想!";
Font f = new Font("隶书", Font.BOLD, 27);
g2.setFont(f);
FontRenderContext context = g2.getFontRenderContext();
Rectangle2D bounds = f.getStringBounds(message, context);
double x = (getWidth() - bounds.getWidth()) / 2;
double y = (getHeight() - bounds.getHeight()) / 2;
double ascent = -bounds.getY();
double baseY = y + ascent;
g2.setPaint(Color.RED);
g2.drawString (message, (int)x, (int)(baseY));
}
//*********Found**********
private class ColorAction implements ActionListener
{
public ColorAction(Color c)
{
BackgroundColor = c;
}
//*********Found**********
public void actionPerformed (ActionEvent event)
{
setBackground(BackgroundColor);
}
private Color BackgroundColor;
}
}