一、AWT

1. 组件和容器

1.1 frame窗口

基本设置

package com.javase.GUI;

import java.awt.*;

public class TestFrame {
    public static void main(String[] args) {
        Frame frame = new Frame("我的第一个Java图形界面窗口");

        //需要设置可见性
        frame.setVisible(true);

        //设置窗口大小
        frame.setSize(400,400);

        //设置背景颜色
        frame.setBackground(new Color(85,150,68));

        //弹出的初始化位置
        frame.setLocation(200,200);

        //设置大小固定,不能拉伸
        frame.setResizable(false);
    }
}

1.2 panel面板

package com.javase.GUI;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

//panel画板可以看成是一个空间，但是不能单独存在
public class TestPanel {
    public static void main(String[] args) {
        Frame frame = new Frame();
        //布局的概念
        Panel panel = new Panel();

        //设置布局
        frame.setLayout(null);

        frame.setBounds(300,300,500,500);
        frame.setBackground(new Color(175, 229, 123));

        //panel设置坐标，相对于frame
        panel.setBounds(50,50,400,400);
        panel.setBackground(new Color(84, 150, 217));

        frame.add(panel);   //panel面板放进frame窗口
        frame.setVisible(true); //设置可见性

        //监听窗口关闭事件
        //适配器模式 只重写closing
        frame.addWindowListener(new WindowAdapter() {
            //窗口点击关闭后需要做的事情
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0); //结束程序 1为异常退出
            }
        });
    }
}

效果图：

1.3 布局管理器

• 流式布局

package com.javase.GUI;

import java.awt.*;

/**
 * 流式布局  
 */
public class TestFlowLayout {
    public static void main(String[] args) {
        Frame frame = new Frame();

        //按钮组件
        Button button1 = new Button("button1");
        Button button2 = new Button("button2");
        Button button3 = new Button("button3");

        //设置为流式布局
        //frame.setLayout(new FlowLayout());
        //frame.setLayout(new FlowLayout(FlowLayout.LEFT));   //布局靠左
        frame.setLayout(new FlowLayout(FlowLayout.RIGHT));   //布局靠右

        frame.setSize(200,200);

        frame.add(button1);
        frame.add(button2);
        frame.add(button3);

        frame.setVisible(true);


    }
}

• 东西南北中

package com.javase.GUI;

import java.awt.*;

/**
 * 东西南北中布局
 */
public class TestBorderLayout {
    public static void main(String[] args) {
        Frame frame = new Frame("TestBorderLayout");

        Button east = new Button("east");
        Button west = new Button("west");
        Button South = new Button("South");
        Button North = new Button("North");
        Button Center= new Button("Center");

        frame.add(east,BorderLayout.EAST);
        frame.add(west,BorderLayout.WEST);
        frame.add(South,BorderLayout.SOUTH);
        frame.add(North,BorderLayout.NORTH);
        frame.add(Center,BorderLayout.CENTER);

        frame.setSize(200,200);
        frame.setVisible(true);
    }
}

• 表格布局

package com.javase.GUI;

import java.awt.*;

/**
 * 表格布局
 */
public class TestGridLayout {
    public static void main(String[] args) {
        Frame frame = new Frame("TestGridLayout");

        Button btn1 = new Button("btn1");
        Button btn2 = new Button("btn2");
        Button btn3 = new Button("btn3");
        Button btn4 = new Button("btn4");
        Button btn5 = new Button("btn5");
        Button btn6 = new Button("btn6");

        frame.setLayout(new GridLayout(2,3));
        frame.add(btn1);
        frame.add(btn2);
        frame.add(btn3);
        frame.add(btn4);
        frame.add(btn5);
        frame.add(btn6);

        frame.pack();//Java函数！自动选择最优布局
        frame.setVisible(true);
    }
}

综合练习

package com.javase.GUI;

import com.javase.oop.B;

import java.awt.*;

public class ExLayout {
    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.setSize(500,400);
        frame.setLocation(400,400);
        frame.setVisible(true);
        frame.setLayout(new GridLayout(2,1));

        Panel panel1 = new Panel(new BorderLayout());
        Panel panel2 = new Panel(new GridLayout(2,1));
        Panel panel3 = new Panel(new BorderLayout());
        Panel panel4 = new Panel(new GridLayout(2,2));

        panel1.add(new Button("button1"),BorderLayout.EAST);
        panel1.add(new Button("button2"),BorderLayout.WEST);
        panel2.add(new Button("btn1"));
        panel2.add(new Button("btn2"));
        panel1.add(panel2,BorderLayout.CENTER);

        panel3.add(new Button("button3"),BorderLayout.EAST);
        panel3.add(new Button("button4"),BorderLayout.WEST);
        for (int i = 0; i < 4; i++) {
            panel4.add(new Button("btn"+i));
        }
        panel3.add(panel4,BorderLayout.CENTER);

        frame.add(panel1);
        frame.add(panel3);
        frame.setVisible(true);
    }
}

2 事件监听

2.1 按钮事件监听

package com.javase.GUI;

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

/**
 * 事件监听
 */
public class TestActionEvent {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Button button = new Button("点击");
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);
        frame.add(button);
        frame.setVisible(true);
    }
}

class MyActionListener implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("按钮被点击了");
    }
}

2.2 输入框事件监听

textField和textArea区别：
textField是单行文本编辑器；textArea是多行文本编辑器。

package com.javase.GUI;

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

/**
 * 输入框事件监听
 */
public class TestText {
    public static void main(String[] args) {
        new MyFrame();
    }
}

class MyFrame extends Frame{
    public MyFrame(){
        TextField textField = new TextField();
        add(textField);
        setVisible(true);
        //监听文本框输入的文字
        MyActionListener1 myActionListener1 = new MyActionListener1();
        //enter回车键触发事件
        textField.addActionListener(myActionListener1);
        //设置替换编码，如输入密码不可见
        textField.setEchoChar('*');
    }
}
class MyActionListener1 implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        TextField field = (TextField) e.getSource();    //获得一些资源，返回给对象
        System.out.println(field.getText());    //获得输入框文本
        field.setText("");//此行代码表示自动清空上次输入
    }
}

2.3 paint画笔

package com.javase.GUI;
import java.awt.*;

/**
 * paint画笔
 */
public class TestPaint {
    public static void main(String[] args) {
        new Mypaint().LoadFrame();
    }
}
class Mypaint extends Frame {
    public void LoadFrame(){
        setBounds(200,200,600,500);
        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        //设置画笔颜色
        g.setColor(Color.red);
        //画一个实心圆
        g.fillOval(100,100,100,100);

        g.setColor(Color.cyan);
        //画一个矩形
        g.fillRect(150,200,200,200);

    }
}

2.4 鼠标监听

2.4.1 Iterator迭代器

迭代器 it 的两个基本操作是 next 、hasNext 和 remove。
调用 it.next() 会返回迭代器的下一个元素，并且更新迭代器的状态。
调用 it.hasNext() 用于检测集合中是否还有元素。
调用 it.remove() 将迭代器返回的元素删除。

package com.javase.GUI;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;

/**
 * 鼠标监听事件，用鼠标画一个点
 */
public class TestMouseListener {
    public static void main(String[] args) {
        new MyMouseFrame("画图");
    }
}

class MyMouseFrame extends Frame{
    ArrayList points = new ArrayList<>();
    public MyMouseFrame(String title){
        super(title);
        setBounds(200,200,400,300);

        this.addMouseListener(new MyMouseListener());
        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        Iterator iterator = points.iterator();
        while (iterator.hasNext()){ //用迭代器循环判断集合中是否还有元素
            Point point = (Point) iterator.next();  //next指向集合中的下一个元素
            g.setColor(Color.BLUE);
            g.fillOval(point.x,point.y,10,10 );
        }
    }
    public void addPaint(Point point){
        points.add(point);  //把点加进集合
    }

    private class MyMouseListener extends MouseAdapter {
        //鼠标按下事件
        @Override
        public void mousePressed(MouseEvent e) {
            //监听到的东西返回给窗口
            MyMouseFrame myMouseFrame= (MyMouseFrame) e.getSource();
            myMouseFrame.addPaint(new Point(e.getX(),e.getY()));    //获取鼠标点击的位置返回产生一个点

            //每次点击鼠标重新画一次
            myMouseFrame.repaint();
        }
    }
}

2.5 窗口监听

package com.javase.GUI;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * 窗口监听事件
 */
public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}

class WindowFrame extends Frame{
    public WindowFrame(){
        setBounds(200,200,400,400);
        setBackground(Color.blue);
        setVisible(true);
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("closing");
                System.exit(0);
            }

            @Override
            public void windowActivated(WindowEvent e) {
                WindowFrame windowFrame = (WindowFrame) e.getSource();
                windowFrame.setTitle("别走");
                System.out.println("被激活了");
            }
        });
    }
}

2.6 键盘监听

package com.javase.GUI;

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

/**
 * 键盘监听
 */
public class TestKey {
    public static void main(String[] args) {
        new KeyFrame();
    }
}
class KeyFrame extends Frame{
    public KeyFrame(){
        setVisible(true);
        setBackground(Color.cyan);
        setBounds(100,100,200,200);

        this.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                System.out.println(e.getKeyCode());
                if (e.getKeyCode() == KeyEvent.VK_Y) {
                    System.out.println("你按下了Y键");
                }
            }

        });
    }
}

二、Swing

1. 窗口

1.1 JFrame窗口

package com.GUI.Swing;

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

public class TestJFrame {
    public static void main(String[] args) {
        new MyJFrame().init();
    }

}
class MyJFrame extends JFrame{
    public void init(){
        MyJFrame jFrame = new MyJFrame();
        jFrame.setVisible(true);
        jFrame.setBounds(100,100,200,200);
        jFrame.setBackground(Color.GRAY);

        JLabel jLabel = new JLabel("欢迎！");
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);
        jFrame.add(jLabel);
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      //  Container container = this.getContentPane();
       // container.setBackground(Color.cyan);
    }
}

1.2 弹窗

package com.GUI.Swing;

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

/**
 * 弹窗
 */
public class TestDialog {
    public static void main(String[] args) {
        new DialogFrame();
    }
}

class DialogFrame extends JFrame{
    public DialogFrame(){
        setVisible(true);
        setBounds(100,100,500,500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        JButton button = new JButton("点击弹窗");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                new MyDialog();
            }
        });
        button.setBounds(10,10,120,50);
        Container container = this.getContentPane();
        container.setLayout(null);
        container.add(button);

    }

}

class MyDialog extends JDialog{
    public MyDialog(){
        setVisible(true);
        setBounds(150,150,150,150);
        Container container = this.getContentPane();
        container.setLayout(null);
        container.add(new Label("第一个弹窗"));
    }
}

1.3 图标

package com.GUI.Swing;

import javax.swing.*;
import java.awt.*;
import java.net.URL;

/**
 * 图片图标
 */
public class TestImageIcon extends JFrame {
    public TestImageIcon(){
        //获取图片地址
        JLabel label = new JLabel();
        URL url = TestImageIcon.class.getResource("lan.jpg");

        ImageIcon imageIcon = new ImageIcon(url);
        label.setIcon(imageIcon);
        label.setHorizontalAlignment(SwingConstants.CENTER);

        Container container = this.getContentPane();
        container.add(label);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(500,500,500,500);
    }

    public static void main(String[] args) {
        new TestImageIcon();
    }
}

1.4 JScrollDemo面板

可下滑面板

package com.GUI.Swing;

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

/**
 * 下滑面板
 */
public class TestJScroll extends JFrame {
    public TestJScroll(){
        setVisible(true);
        setBounds(100,100,200,100);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        JTextArea textArea = new JTextArea(20,50);
        textArea.setText("我们的征途是星辰大海！");
        Container container = this.getContentPane();

        JScrollPane jScrollPane = new JScrollPane(textArea);
        container.add(jScrollPane);
    }

    public static void main(String[] args) {
        new TestJScroll();
    }
}

2. 按钮

2.1 图片按钮

package com.GUI.Swing;
import javax.swing.*;
import java.awt.*;
import java.net.URL;

/**
 * 图片按钮
 */
public class TestButton1 extends JFrame {
    public TestButton1(){
        URL url = TestButton1.class.getResource("lan.jpg");
        Icon icon = new ImageIcon(url);

        JButton button = new JButton();
        button.setIcon(icon);
        button.setToolTipText("图片按钮");

        Container container = this.getContentPane();
        container.add(button);

        setVisible(true);
        setSize(700,700);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        new TestButton1();
    }
}

2.2 单选按钮

package com.GUI.Swing;
import javax.swing.*;
import java.awt.*;
/**
 * 单选框
 */
public class TestButton2 extends JFrame{
    public TestButton2(){
     
        //单选框
        JRadioButton jRadioButton1 = new JRadioButton("A");
        JRadioButton jRadioButton2 = new JRadioButton("B");
        JRadioButton jRadioButton3 = new JRadioButton("C");
        
        //由于单选框只能选择一个，放入分组中，一个分组中只能选择一个
        ButtonGroup group = new ButtonGroup();
        group.add(jRadioButton1);
        group.add(jRadioButton2);
        group.add(jRadioButton3);

        Container container = this.getContentPane();
        container.add(jRadioButton1,BorderLayout.NORTH);
        container.add(jRadioButton2,BorderLayout.CENTER);
        container.add(jRadioButton3,BorderLayout.SOUTH);

        setVisible(true);
        setSize(700,700);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        new TestButton2();
    }
}

2.3 复选按钮

package com.GUI.Swing;
import javax.swing.*;
import java.awt.*;
/**
 * 多选框
 */
public class TestButton3 extends JFrame {
    public TestButton3(){

        //多选框
        JCheckBox checkBox1 = new JCheckBox("自动登录");
        JCheckBox checkBox2 = new JCheckBox("手动登录");
        JCheckBox checkBox3 = new JCheckBox("记住密码");


        Container container = this.getContentPane();
        container.add(checkBox1,BorderLayout.WEST);
        container.add(checkBox2,BorderLayout.CENTER);
        container.add(checkBox3,BorderLayout.EAST);

        setVisible(true);
        setSize(700,700);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        new TestButton3();
    }
}

3. 列表

3.1 下拉框

package com.GUI.Swing;

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

/**
 * 下拉框
 */
public class TestSelect extends JFrame {
    TestSelect(){
        Container container = this.getContentPane();
        //下拉框
        JComboBox jComboBox = new JComboBox();
        jComboBox.addItem(null);
        jComboBox.addItem("芋泥奶茶");
        jComboBox.addItem("布蕾奶茶");
        jComboBox.addItem("绿豆冰沙");

        container.add(jComboBox);
        setVisible(true);
        setSize(500,350);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestSelect();
    }
}

3.2 列表框

package com.GUI.Swing;

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

/**
 * 列表框
 */
public class TestSelect2 extends JFrame {
    TestSelect2(){
        Container container = this.getContentPane();
        //生成列表内容
        String[] content ={"芋泥奶茶","布蕾奶茶","绿豆冰沙"};
        //列表中放入内容
        JList jList = new JList(content);

        container.add(jList);
        setVisible(true);
        setSize(500,350);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestSelect2();
    }
}

4.文本框

4.1 文本框

package com.GUI.Swing;
import javax.swing.*;
import java.awt.*;
/**
 * 文本框
 */
public class TestText01 extends JFrame{
    public TestText01(){
        Container container = this.getContentPane();
        JTextField textField1 = new JTextField("蓝天");
        JTextField textField2 = new JTextField("白云");

        container.add(textField1,BorderLayout.NORTH);
        container.add(textField2,BorderLayout.SOUTH);
        setVisible(true);
        setSize(500,350);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestText01();
    }
}

4.2 密码框

package com.GUI.Swing;
import javax.swing.*;
import java.awt.*;

/**
 * 密码框
 */
public class TestText02 extends JFrame {
    public TestText02(){
        Container container = this.getContentPane();

        //密码框
        JPasswordField jPasswordField = new JPasswordField();
        jPasswordField.setEchoChar('*');

        container.add(jPasswordField);
        setVisible(true);
        setSize(500,350);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestText02();
    }
}

4.3 文本域

JTextArea;

三、贪吃蛇

帧，如果时间片足够小，就是动画，一秒30帧

1. 主程序代码

package com.GUI.Game;
import javax.swing.*;

/**
 * 主程序
 */
public class EatSnake {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setTitle("贪吃蛇小游戏");
        frame.setBounds(10,10,900,720);
        frame.setResizable(false);  //窗口大小不可变
        frame.setVisible(true);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //放游戏面板
        frame.add(new GamePanel());
    }
}

2. 游戏面板代码

package com.GUI.Game;

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

/**
 * 游戏面板
 */
public class GamePanel extends JPanel implements KeyListener , ActionListener {
    //定义蛇的数据结构
    int length;
    int [] snakeX = new int[600];//蛇的X坐标
    int [] snakeY = new int[500];//蛇的Y坐标
    String fx;
    int score;
    //食物坐标
    int foodx;
    int foody;
    Random radom = new Random();

    //游戏状态：开始，停止
    boolean isStart = false;
    boolean isFail = false;

    //定时器 1000ms执行一次
    Timer timer = new  Timer(100,this);

    public GamePanel(){
        init();
        //获得焦点和键盘事件
        this.setFocusable(true);
        this.addKeyListener(this);
        timer.start();
    }

    public void init(){
        length = 3;
        snakeX[0] = 100; snakeY[0] = 100;   //头的坐标
        snakeX[1] = 75; snakeY[1] = 100;    //第一个身体坐标
        snakeX[2] = 50; snakeY[2] = 100;
        fx = "R";//初始方向向右
        //随机产生食物
        foodx = 25 + 25*radom.nextInt(34);
        foody = 75 + 25*radom.nextInt(24);
        score = 0;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        //绘制静态的面板
        g.fillRect(25,75,850,600);//游戏区
        this.setBackground(Color.WHITE);
        //画积分
        g.setColor(Color.BLUE);
        g.setFont(new Font("微软雅黑",Font.BOLD,30));
        g.drawString("分数"+score,750,50);
        //把小蛇画上去
        if(fx.equals("R")){
            Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);   //蛇头向右
        }else if(fx.equals("L")){
            Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if(fx.equals("U")){
            Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if(fx.equals("D")){
            Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);
        }

        for (int i = 1; i < length; i++) {
            Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
        }
        Data.food.paintIcon(this,g,foodx,foody);

        //游戏状态
        if(isStart == false){
            g.setColor(Color.white);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("按下空格开始游戏",300,300);
        }
        if (isFail ) {
            g.setColor(Color.RED);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("游戏失败，按下空格开始游戏",200,300);
        }
    }
    //键盘监听事件
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();   //获取键盘按键
        if (keyCode == KeyEvent.VK_SPACE) {
            if (isFail) {
                isFail = false;
                init();
            }else {
                isStart = !isStart;
            }
            repaint();  //换行重新绘制
        }
        if (keyCode == KeyEvent.VK_UP){
            fx = "U";
        }else if (keyCode == KeyEvent.VK_DOWN){
            fx = "D";
        }else if (keyCode == KeyEvent.VK_LEFT){
            fx = "L";
        }else if (keyCode == KeyEvent.VK_RIGHT){
            fx = "R";
        }

    }

    //重写定时器事件监听方法
    @Override
    public void actionPerformed(ActionEvent e) {
        if (isStart && !isFail) {
            //吃食物
            if (snakeX[0] == foodx && snakeY[0] == foody ) {
                length++;
                score += 5;
                //再次随机产生食物
                foodx = 25 + 25*radom.nextInt(34);
                foody = 75 + 25*radom.nextInt(24);
            }

            //后一节移到前一节
            for (int i = length-1; i >0 ; i--) {
                snakeX[i] = snakeX[i-1];
                snakeY[i] = snakeY[i-1];
            }
            //改变方向
            if (fx.equals("R")) {
                snakeX[0] = snakeX[0] + 25;
                //边界判断
                if (snakeX[0] > 850) {
                    snakeX[0] = 25;
                }
            }else if (fx.equals("L")) {
                snakeX[0] = snakeX[0] - 25;
                //边界判断
                if (snakeX[0] < 25) {
                    snakeX[0] = 850;
                }
            }else if (fx.equals("U")) {
                snakeY[0] = snakeY[0] - 25;
                //边界判断
                if (snakeY[0] < 75) {
                    snakeY[0] = 650;
                }
            }else if (fx.equals("D")) {
                snakeY[0] = snakeY[0] + 25;
                //边界判断
                if (snakeY[0] > 650) {
                    snakeY[0] = 75;
                }
            }



            //撞到自己就算失败
            for (int i = 1; i < length; i++) {
                if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
                    isFail = true;
                }
            }
            repaint();
        }
        timer.start();
    }
    @Override
    public void keyTyped(KeyEvent e) {

    }

    @Override
    public void keyReleased(KeyEvent e) {

    }


}

3. 数据中心代码

package com.GUI.Game;

import javax.swing.*;
import java.net.URL;
import javax.swing.ImageIcon;
/**
 * 数据中心
 */
public class Data {
    public static URL upurl = Data.class.getResource("statics/up.png");
    public static URL downurl = Data.class.getResource("statics/down.png");
    public static URL lefturl = Data.class.getResource("statics/left.png");
    public static URL righturl = Data.class.getResource("statics/right.png");
    public static URL bodyurl = Data.class.getResource("statics/body.png");
    public static URL foodurl = Data.class.getResource("statics/food.png");

    public static ImageIcon right = new ImageIcon(righturl);
    public static ImageIcon body = new ImageIcon(bodyurl);
    public static ImageIcon food = new ImageIcon(foodurl);
    public static ImageIcon up = new ImageIcon(upurl);
    public static ImageIcon down = new ImageIcon(downurl);
    public static ImageIcon left = new ImageIcon(lefturl);

}

由于自己的素材一直获取不到，且获取到的大小不合适，最后还是采用了狂神的素材。