Java 由淺入深GUI編程實戰練習（二）

一，項目簡介

1.利用Java GUI 繪製圖像界面，設置整體佈局

2.編寫一個隨機數生成1~100的隨機數

3.編寫一個驗證類，用於驗證用戶輸入值與生成隨機數是否相等並記錄用戶猜測次數，當用戶猜測成功或者超過5次結束游戲

二，運行界面

三，代碼實現

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Demo5 extends JFrame implements ActionListener {

    JPanel p1;
    JButton btn1, btn2;
    JLabel jb1, jb2, jb3;
    JLabel Haiamge;
    JTextField text;
    JTextArea area;
    ImageIcon image;
    ImageIcon image1 = new ImageIcon("img/1.jpg"), image2 = new ImageIcon("img/2.jpg"),
            image3 = new ImageIcon("img/3.jpg"), image4 = new ImageIcon("img/4.gif");
    int number;
    boolean flat = false;// 是否生成隨機數
    // 構造函數

    public Demo5() {
        setTitle("我的猜字游戲");
        setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        setResizable(false);
        setLayout(null);// 先設置為null，不然不顯示
        setSize(400, 300);
        setLocation(30, 30);
        getContentPane().setBackground(Color.GRAY);// 一定要加getContentPane

        p1 = new JPanel();
        p1.setBackground(Color.LIGHT_GRAY);
        p1.setBounds(0, 0, 320, 100);
        p1.setLayout(null);
        add(p1);

        btn1 = new JButton("生成隨機數");
        btn1.setBounds(200, 20, 100, 25);
        btn1.addActionListener(this);
        p1.add(btn1);

        btn2 = new JButton("確定");
        btn2.setBounds(200, 50, 100, 25);
        btn2.addActionListener(this);
        p1.add(btn2);

        jb1 = new JLabel("選擇一個隨機數");
        jb1.setForeground(Color.BLUE);
        jb1.setBounds(40, 20, 110, 23);
        p1.add(jb1);

        jb2 = new JLabel("然後輸入推測數字(1~100)");
        jb2.setForeground(Color.BLUE);
        jb2.setBounds(20, 35, 150, 23);
        p1.add(jb2);

        text = new JTextField("0");
        text.setForeground(Color.magenta);
        text.setBounds(40, 60, 110, 23);
        p1.add(text);

        jb3 = new JLabel("未生成隨機數");
        jb3.setForeground(Color.red);
        jb3.setBackground(Color.gray);
        jb3.setBounds(20, 160, 120, 23);
        add(jb3);

        area = new JTextArea("我猜！我猜！我猜猜猜！");
        area.setForeground(Color.green);
        area.setBackground(Color.gray);
        area.setFont(new Font("宋體", Font.BOLD, 13));
        area.setEditable(false);
        area.setBounds(20, 130, 150, 25);
        add(area);

        Haiamge = new JLabel();
        Haiamge.setBounds(180, 101, 128, 128);
        add(Haiamge);

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

        if (e.getSource() == btn1) {
            number = (int) (Math.random() * 10) + 1;
            jb3.setText("已生成隨機數");
            area.setText("猜");
            Haiamge.setIcon(image2);
            flat = true;// 生成隨機數
        } else if (e.getSource() == btn2) {
            int guess = 0;
            try {
                guess = Integer.parseInt(text.getText());
                if (flat == false) {
                    area.setText("失敗");
                    return;
                } else {
                    if (guess == number) {
                        area.setText(" 猜對了！就是" + number);
                        flat = false;
                        jb3.setText("未生成隨機數");
                        Haiamge.setIcon(image1);
                    } else if (guess > number) {
                        area.setText(" 猜大了！");
                        text.setText(null);
                        Haiamge.setIcon(image3);
                    } else if (guess < number) {
                        area.setText("猜小了！");
                        text.setText(null);
                        Haiamge.setIcon(image4);
                    }
                }
            } catch (NumberFormatException event) {
                event.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Demo5 dem = new Demo5();
        dem.setVisible(true);

    }
}

補充 我的註意事項：