java计算机二级31套

import javax.swing.JOptionPane;

public class Java_1{
//*********Found**********
   public static void main( String args[] ){
      PackageData d = new PackageData();
      String output;
      output = "实例化后:\n" + d.toString();
      d.x = 77;          //修改包访问的数据
//*********Found**********
      d.s = "祝您成功!";  //修改包访问的数据
      output += "\n修改数据后的访问结果:\n" + d.toString();
//*********Found**********
      JOptionPane.showMessageDialog( null, output,
         "对包的访问示范",
         JOptionPane.INFORMATION_MESSAGE );
      System.exit( 0 );
   }
}

class PackageData {
   int x;     //访问包的实例变量
   String s;  //访问包的实例变量
   //构造方法
   public PackageData(){ 
      x = 0; 
      s = "Hello";
   }               
   public String toString(){
      return "x: " + x + "    s: " + s;
   }
}

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

public class Java_2{
  public static void main(String[] args){
    WelcomFrame frame = new WelcomFrame();
//*********Found**********
    frame.setDefaultCloseOperation(JFrame._____________________ );
    frame.setVisible(true);
  }
}
//*********Found**********
class WelcomFrame extends JFrame{
  public WelcomFrame(){
    setTitle("Java等级考试");
//*********Found**********
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
    WelcomPanel panel = new WelcomPanel();
    Container contentPane = getContentPane();
    contentPane.add(panel);
  }
  public static final int DEFAULT_WIDTH = 250;
  public static final int DEFAULT_HEIGHT = 100;
}
//*********Found**********
class WelcomPanel extends JPanel{
  public void paintComponent(Graphics g){
    super.paintComponent(g);
    g.drawString("欢迎参加Java等级考试！",MESSAGE_X, MESSAGE_Y);
  }
  public static final int MESSAGE_X = 60;
  public static final int MESSAGE_Y = 50;
}

import javax.swing.JOptionPane;

public class Java_3 {
   public static void main( String args[] ){
      String firstNumber,   //存储第1个输入数据
             secondNumber,  //存储第2个输入数据
     //*********Found********
             result;        //字符串输出
      int number1,          //用来比较的第1个int型数据 
          number2;          //用来比较的第2个int型数据
      //以字符串格式读输入数据
      firstNumber =
         JOptionPane.showInputDialog( "请输入第1个整数:" );
      secondNumber =
         JOptionPane.showInputDialog( "请输入第2个整数:" );          
      //将字符串转换为int整数
     //*********Found********
      number1 = Integer.parseInt( firstNumber );
     //*********Found********
      number2 = Integer.parseInt( secondNumber );
      //用空字符串初始化结果变量
      result = "";
      if ( number1 == number2 )
         result = number1 + " == " + number2;
      if ( number1 != number2 )
         result = number1 + " != " + number2;
      if ( number1 < number2 )
         result = result + "\n" + number1 + " < " + number2;
      if ( number1 > number2 )
         result = result + "\n" + number1 + " > " + number2;
      if ( number1 <= number2 )
         result = result + "\n" + number1 + " <= " + number2;
      if ( number1 >= number2 )
         result = result + "\n" + number1 + " >= " + number2;
      //显示结果
      JOptionPane.showMessageDialog(
         null, result, "比较结果",
         JOptionPane.INFORMATION_MESSAGE);
      //*********Found********
      System.exit( 0 );
   }
}