testb.java

java制作学生查询系统

import java.awt.*;
import java.awt.event.*;

public class testB
{
	public static void main(String args[])
{
	MyDialogFrame df=new MyDialogFrame();
}
}

class MyDialogFrame extends Frame implements ActionListener,ComponentListener,FocusListener
{
	Dialog Meg,Inout;
	Button btn1,btn2,btnY,btnN,btnR;
	TextField tf=new TextField("无信息",45);
	TextField getMeg=new TextField("输入信息",10);
	
	MyDialogFrame()
	{
		super("使用对话框");
		btn1=new Button("隐藏");
		btn2=new Button("询问");
		btnY=new Button("是");
		btnN=new Button("否");
		btnR=new Button("返回");
	    setLayout(new FlowLayout());
	    add(tf);
	    add(btn1);
	    add(btn2);
	    btn1.addComponentListener(this);
	    this.addWindowListener(new WinAdpt());
	    btn1.addActionListener(this);
	    btn2.addActionListener(this);
	    btnY.addActionListener(this);
	    btnN.addActionListener(this);
	    btnR.addActionListener(this);
	    setSize(350,150);
	    show();
	 }    
public void actionPerformed(ActionEvent e)
{
     if(e.getActionCommand()=="隐藏")
     {
     	Meg=new Dialog(this,"真的要隐藏吗？",true);
     	Panel p1=new Panel();
     	p1.add(new Label("此操作将隐藏按钮，继续吗？"));
     	Meg.add("Center",p1);
     	Panel p2=new Panel();
     	p2.add(btnY);
     	p2.add(btnN);
     	Meg.add("South",p2);
     	Meg.setSize(200,100);
     	Meg.show();
     }
     else if(e.getActionCommand()=="询问")
     {
  	    Inout=new Dialog(this,"请输入信息");
     
     	Inout.add("Center",getMeg);
     	Inout.add("South",btnR);
     	Inout.setSize(200,100);
     	Inout.addFocusListener(this);
     	Inout.show();
     }
     
     else if(e.getActionCommand()=="是")
     {
     	Meg.dispose();
     	btn1.setVisible(false);
     }
     else if(e.getActionCommand()=="否")
     
     	Meg.dispose();
     else if(e.getActionCommand()=="返回")
	 {
	 	tf.setText(getMeg.getText()+"是对话框的输入");
	 	Inout.dispose();
	 }	   
}

public void componentShown(ComponentEvent e){}
public void componentResized(ComponentEvent e){}
public void componentMoved(ComponentEvent e){}
public void componentHidden(ComponentEvent e)
{
	tf.setText("按钮\""+((Button)e.getComponent()).getLable()+"\"被隐藏!");
}
   
public void focusGained(FocusEvent e)
{
	getMeg.setText("对话框\""+((Dialog)e.getComponent()).getTitle()+"\"获得了注意的焦点!");
}
public void focusLost(FocusEvent e){}

 }  
class WinAdpt extends WindowAdapter	
{    
	public void windowClosing(WindowEvent e)    
	 { 
	    ((Frame)e.getWindow()).dispose();
	    System.exit(0);
	 }
}