基本操作

例一：
public class exam_30{
 public static void main(String[] args) {
  int []score={56,90,89,23,45,61,60,59};
  int num=0;
  __________;
  int i=0;
  while(__________){
   if(__________)
    sum++;
   i++;
  }
  System.out.println("<60:"+sum);
 }
}

简单应用

例一：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;

public class exam_1 extends JFrame
   implements ActionListener
{  public exam_1()
   {  setTitle("ImageViewer");
      setSize(300, 400);

      JMenuBar mbar = new JMenuBar();
      JMenu m = new JMenu("File");
      openItem = new JMenuItem("Open");
      openItem.addActionListener(this);
      m.add(openItem);
      exitItem = new JMenuItem("Exit");
      exitItem.addActionListener(this);
      m.add(exitItem);
      mbar.add(m);
      setJMenuBar(mbar);

      label = new JLabel();
      Container contentPane = getContentPane();
      contentPane.add(label, "Center");
　　．．．．．．．．．．．．．．．．．．．．．

   点击下载全部内容