Java计算机二级27套

public class Java_1 {
    public static void main(String args[]) {
        
        int x,n;
        
     //*********Found********
        n = 0;
        for( x = 100 ; x <= 200 ; x++)
            if  ( x % 9 == 0 ) {
     //*********Found********
                System.out.print("  " + x);
                n++;
     //*********Found********
                if ( n % 5 ==0) System.out.println( );
            }
    }
}

import java.io.*;
import java.util.Vector;

public class Java_2{
   public static void main(String s[]){
      Vector v=new Vector();
      try{
         //*********Found**********
         BufferedReader in = new BufferedReader(new InputStreamReader(System.in));    //键盘输入
         String str = "";
         System.out.println("请输入用户和密码信息，中间用空格隔开，输入quit退出:");
         while (!(str.equals("quit")||str.equals("QUIT"))){
            str = in.readLine();
            //*********Found**********
            if(isValid(str))      //验证输入是否有空格
               v.add(str);
            else{
               if(!(str.equals("quit")||str.equals("QUIT")))
                  System.out.println("The string is NOT valid!");
            }
         }
	        
         System.out.println("请输入保存到的文件名:");
         //*********Found**********
         str=in.readLine();

         String curDir = System.getProperty("user.dir");
         File savedfile=new File(curDir+"\\"+str);
            
         //*********Found**********
         BufferedWriter out = new BufferedWriter(new FileWriter(___________________));
         for(int i=0; i<v.size(); i++){
            String tmp=(String)v.elementAt(i);
            out.write(tmp);
            //*********Found**********
            out.write("\n");      //换行
         }
         out.close();
        
      }
      //*********Found**********
      catch(Exception e){
         System.out.print("ERROR:"+e.getMessage());	
      }
   }
   /**
   * 判定输入的字符串是否符合规范
   * @param  s  输入的待校验的字符串
   * @return    校验的结果，正确则返回为真
   */
   public static boolean isValid(String s){
      if(s.indexOf(" ")>0) return true;
      else return false;
   }
}

//*********Found**********
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

//*********Found**********
public class Java_3 extends MouseAdapter implements ActionListener
{
   //*********Found**********
   private JPopupMenu pop;
   private JMenu subPop;
   private JMenuItem color;
   private JMenuItem exit;
   private JMenuItem red;
   private JMenuItem blue;
   private JTextArea textArea;
   private JFrame frame;

   public void initGUI()
   {
      pop=new JPopupMenu();
   
      subPop=new JMenu("color");
      red=new JMenuItem("red");
      red.addActionListener(this);
      blue=new JMenuItem("blue");
      blue.addActionListener(this);
      subPop.add(red);
      subPop.add(blue);

      exit=new JMenuItem("exit");
      exit.addActionListener(this);

      pop.add(subPop);
      pop.add(exit);
		
      //*********Found**********  
      frame=new JFrame("popup frame");
      textArea=new JTextArea("",10,10);
	
      textArea.addMouseListener(this);
      frame.getContentPane().add(textArea);
      frame.setSize(300,300);
      frame.setVisible(true);
	
      frame.addWindowListener(new WindowAdapter()
      {
         //*********Found**********  
         public void windowClosing(WindowEvent e)
         {
            System.exit(0);
         }
      });
   }
	
   public void actionPerformed(ActionEvent event)
   {
      if(event.getSource()==red)
      {
         textArea.setForeground(Color.red);
         textArea.setText("red menu is selected");
      }
      else if(event.getSource()==blue)
      {
         textArea.setForeground(Color.blue);
         textArea.setText("blue menu is selected");
      }
      else if(event.getSource()==exit)
      {
         frame.setVisible(false);
         System.exit(0);
      }
   }

   public void mousePressed(MouseEvent e)
   {
      if(e.getModifiers()==e.BUTTON3_MASK)
      {
         pop.show(e.getComponent(),e.getX(),e.getY());
      }
   }
	
   public static void main(String args[])
   {
      Java_3 example=new Java_3();
      example.initGUI();
   } 
}