java二级试卷29

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class Java_3
{
   public static void main(String[] args)
   {
      ExceptTestFrame frame = new ExceptTestFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

class ExceptTestFrame extends JFrame
{
   public ExceptTestFrame()
   {
      setTitle("ExceptTest");
      Container contentPane = getContentPane();
      ExceptTestPanel panel = new ExceptTestPanel();
 //*********Found********
      contentPane.add(panel);
      pack();
   }
}

class ExceptTestPanel extends Box
{
   public ExceptTestPanel()
   {
      super(BoxLayout.Y_AXIS);
      group = new ButtonGroup();
      addRadioButton("整数被零除", new
         ActionListener()
         {
     //*********Found********
            public void actionPerformed(ActionEvent event)
            {
               a[1] = 1 / (a.length - a.length);
            }
         });
      textField = new JTextField(30);
      add(textField);
   }

  //*********Found********
   private void addRadioButton(String s, ActionListener listener)
   {
      JRadioButton button = new JRadioButton(s, false)
         {
            protected void fireActionPerformed(ActionEvent event)
            {
               try
               {
                  textField.setText("No exception");
                  super.fireActionPerformed(event);
               }
               catch (Exception exception)
               {
     //*********Found********
                  textField.setText(exception.toString());
               }
            }
         };
      button.addActionListener(listener);
      add(button);
      group.add(button);
   }
   private ButtonGroup group;
   private JTextField textField;
   private double[] a = new double[10];
}

public class Java_1
{
    public static void main(String args[])
    {
        int i,count;
        
     //*********Found********
        count = 0;
        
        for( i=100 ; i <= 200 ; i++)
     //*********Found********
            if ( i%3 == 0 ) count++;
        
     //*********Found********
        System.out.println("Count = " + count);
    }  
}

import javax.swing.*;
import java.awt.event.*;
	
public class Java_2 extends JFrame {
    private JButton b;
    public Java_2(String s){
        setTitle(s);
        b=new JButton("Hello");
        getContentPane().add(b);
     //*********Found********
        b.addActionListener( new HandleButton() );
	setSize(150,150);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     //*********Found********
	setVisible( true);	
    }
    class HandleButton implements ActionListener{
        public void actionPerformed(ActionEvent e){
             //*********Found********
            if ( "Hello".equals( b.getText()) )
                b.setText("你好");
            else
                b.setText("Hello");                          
        }
    }
    public static void main(String args[]){
         //*********Found********
        new Java_2("二级Java");	
    }    
}