suiji.java

随机数

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


public class SuiJi extends JFrame{
	private int count = (int)(Math.random()*100)+0;
	private JLabel Lab;
	private JButton btn_ok;
	private JTextField text_show,text_tip;
	
	public SuiJi(){
		super("随机数");
		Lab = new JLabel("输入一个0~100的数：");
		btn_ok = new JButton("OK");
		text_show = new JTextField();
		text_tip = new JTextField();

		this.setSize(300,100);
		this.setResizable(false);
		this.setLocation(300,240);
		this.add(Lab,"North");
		this.add(text_tip,"South");
		this.add(text_show,"Center");
		this.add(btn_ok,"East");
		this.setVisible(true);
		btn_ok.addActionListener(new TFlistener());
		
		this.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		});
	}
	
	private class TFlistener implements ActionListener{
		
		public void actionPerformed(ActionEvent e){
		int i = Integer.parseInt(text_show.getText());
		if(i>count){
			text_tip.setText("所输的数较大，请重新输入");
			text_show.setText("");
		}
		else if(i<count){
			text_tip.setText("所输的数较小，请重新输入");
			text_show.setText("");
		}
		else{
			text_tip.setText("输入正确,数值为："+text_show.getText());
		}
		}
	}
	
	public static void main(String args[]){
		SuiJi suiji = new SuiJi();
	}
}