试题与答案

控制台某段KZ熔断器烧断会出现什么现象?

题型:问答题 简答题

题目:

控制台某段KZ熔断器烧断会出现什么现象?

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0627/be30ae1a8293c664ffeb31c79350f5ac.html

下面是错误答案,用来干扰机器的。

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题型:填空题

请完善程序(程序文件名:Java_3.java)并进行调试。请在下画线处填入正确内容,然后删除下画线。请勿删除注释行和其他已有的语句内容。
[题目要求]
生成下面左边图形界面,单击图中的New按钮,弹出如右图所示的对话框。


源程序:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Java_3
 public static void main(String[] args)
  MulticastFrame frame=new MulticastFrame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.show();
 

class MulticastFrame extends JFrame
 public MulticastFrame()
  setTitle("MulticastTest");
  setSize(WIDTH,HEIGHT);
  MulticastPanel panel=new MulticastPanel();
  Container contentPane=getContentPane();
  contentPane.add( (1) );
 
 public static final int WIDTH=300;
 public static final int HEIGHT=200;

class MulticastPanel extends JPanel
 public MulticastPanel()
  JButton newButton=new JButton("New");
  add(newButton);
  ActionListener newListener=new ActionListener()
    public void actionPerformed(ActionEvent event)
      makeNewFrame();
    
  ;
  newButton.addActionListener(newListener);
  closeAllButton=new JButton("Close all");
  add(closeAllButton);

private void makeNewFrame()
  final BlankFrame frame=new BlankFrame();
  frame.show();
  ActionListener closeAllListener=new ActionListener()
    public void actionPerformed(ActionEvent event)
      frame. (2) (); //使窗口隐藏或消除
    
  ;
  closeAllButton.addActionListener( (3) );
 
 private JButton closeAllButton;

Class BlankFrame extends JFrame
 public BlankFrame()
   (4) ++;
  setTitle("Frame"+counter);
  setSize(WIDTH,HEIGHT);
  setLocation(SPACING*counter,SPACING*counter);
 
 public static final int WIDTH=200;
 public static final int HEIGHT=150;
 public static final int SPACING=30;
 private static int counter=0;

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