JAVA-猜数字游戏功能实现事务机制

package com.itheima;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

public class CAISHUZIYOUXI {
    public static void main(String[] args) {
        JFrame jf=new JFrame();
        jf.setTitle("聊天室");
        jf.setSize(400,300);
        jf.setDefaultCloseOperation(3);
        jf.setLocationRelativeTo(null);
        jf.setAlwaysOnTop(true);
        jf.setLayout(null);        //取消窗体的默认布局

        //生成1-100的随机数
        Random r =new Random();
        int number = r.nextInt(100)+1;

        //提示信息
        JLabel messagelabel =new JLabel("系统产生了一个1-100之间的数据，请猜一猜");
        messagelabel.setBounds(70,50,350,20);
        jf.add(messagelabel);

        //输入要猜的数字
        JTextField numberField = new JTextField();
        numberField.setBounds(120,100,150,20);
        jf.add(numberField);

        //猜数字的按钮

        JButton GuessButton = new JButton("我猜");
        GuessButton.setBounds(150,150,100,20);
        jf.add(GuessButton);


        GuessButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                //判断猜的内容不能为空
                String stringNumber = numberField.getText().trim();
                if (stringNumber.equals("")){
                    JOptionPane.showMessageDialog(jf,"猜的数字不能为空");
                    return;
                }
                //每次根据猜的数字给出响应的提示
                int guessnumber = Integer.parseInt(stringNumber);

                if (guessnumber>number){
                    JOptionPane.showMessageDialog(jf,"你猜的数字大了");
                    numberField.setText("");
                } else if (guessnumber<number) {
                    JOptionPane.showMessageDialog(jf,"你猜的数字小了");
                    numberField.setText("");

                }else{
                    JOptionPane.showMessageDialog(jf,"恭喜你猜中了");
                }
            }
        });

        //添加按钮到窗体中
        jf.setVisible(true);


    }
}