GUI编程
GUI编程
问题：
-
这是什么
-
怎么玩
-
该如何应用
-
反编译 class->可阅读
组件
- 窗口
- 弹窗
- 面板
- 文本框
- 列表框
- 按钮
- 图片
- 监听事件
- 鼠标
- 键盘
- 破解工具
1、简介
GUI的核心技术: Swing AWT
- 因为界面不美观
- 需要 jre 环境！
为什么要学习？
- 是之后学习的基础
- 可以写出心中的小工具
- 工作时候可能维护 Swing 界面，概率非常小
- 了解 MVC 架构，了解监听！！
2、AWT
2.1、AWT介绍
- 包含了很多类和接口！GUI:图形用户界面编程（Eclipse：用Java写的）
- 元素：窗口，按钮，文本框
- java.awt
2.2、组件和容器
1、Frame
//Frame,JDK, 看源码
Frame frame = new Frame("my first Java GUI");
//设置可见性 w h
frame.setVisible(true);
//设置窗口大小
frame.setSize(400,400);
//color
// new Color():
frame.setBackground(new Color(25, 202, 219));
//弹出的初始位置
frame.setLocation(200,200);
//设置大小固定
frame.setResizable(false);
问题：发现关不掉（终止程序运行）
尝试回顾封装：
package com.wang.learn01;
import java.awt.*;
public class TestFrame2 {
public static void main(String[] args){
//展示多个窗口
MyFrame myFrame1 = new MyFrame(100, 100, 200, 200, Color.blue);
MyFrame myFrame2 = new MyFrame(300, 100, 200, 200, Color.yellow);
MyFrame myFrame3 = new MyFrame(100, 300, 200, 200, Color.red);
MyFrame myFrame4 = new MyFrame(300, 300, 200, 200, Color.magenta);
}
static class MyFrame extends Frame{
static int id = 0;//可能存在多个窗口，需要计数器
public MyFrame(int x,int y,int w, int h,Color color){
super("MyFrame"+(++id));
setBackground(color);
setBounds(x, y, w, h);
setVisible(true);
}
}
}
2、面板Panel
解决了关闭事件
package com.wang.learn01;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
//Panel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);
// 坐标
frame.setBounds(300,300,500,500);
frame.setBackground(new Color(40,161,35));
// panel设置坐标，相对于frame
panel.setBounds(50,50,400,400);
panel.setBackground(new Color(190, 17, 17));
// Panel extends Container, Container extends Component
frame.add(panel);
frame.setVisible(true);
// 监听事件，监听窗口关闭事件 System.exit(0)
//适配器模式:
frame.addWindowListener(new WindowAdapter() {
// 窗口点击关闭,结束程序
@Override
public void windowClosing(WindowEvent e) {
// super.windowClosing(e);
System.exit(0);
}
});
}
}
2.3、布局管理器
- 流式布局
package com.wang.learn01;
import java.awt.*;
public class TestFlowLayout {
public static void main(String[] args) {
Frame frame = new Frame();
//组件-按钮
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(FlowLayout.LEFT));
frame.setLayout(new FlowLayout(FlowLayout.RIGHT));
frame.setSize(200,200);
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.setVisible(true);
}
}
- 东西南北中
![]()
package com.wang.learn01;
import java.awt.*;
public class TestBorderLayout {
public static void main(String[] args) {
Frame frame = new Frame();
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 Grid
package com.wang.learn01;
import java.awt.*;
public class TestGridLayout {
public static void main(String[] args) {
Frame frame = new Frame();
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(3,2));
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.setSize(200,200);
frame.setVisible(true);
}
}
- demo
package com.wang.learn01;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestGridLayout {
public static void main(String[] args) {
Frame frame = new Frame();
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(3,2));
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.setSize(200,200);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
- 总结
- Frame是顶级窗口
- Panel无法单独显示，必须添加到某个容器中
- 布局管理器
- 流式布局
- 东西南北中
- 表格
- 大小,背景颜色,定位,可见性,事件监听!
2.4、事件监听
事件监听：当事情发生时，应该干什么？
package com.wang.learn02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestActionEvent {
public static void main(String[] args) {
//按钮发生事件
Frame frame = new Frame();
Button button = new Button();
//因为addActionListener()需要一个ActionListener，所以需要构造一个ActionListener
MyActionListener myActionListener = new MyActionListener();
button.addActionListener(myActionListener);
frame.add(button, BorderLayout.CENTER);
frame.pack();
windowClose(frame);//关闭窗口
frame.setVisible(true);
}
//关闭窗体事件
private static void windowClose(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
//事件监听
class MyActionListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("aaa");
}
}
多个按钮，共享应该事件
package com.wang.learn02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestActionEvent2 {
public static void main(String[] args) {
// 两个按钮实现同一个监听
// 开始，停止
Frame frame = new Frame("开始-停止");
Button button1 = new Button();
Button button2 = new Button("stop");
button2.setActionCommand("button2-stop");
// 可以显示定义触发会返回的命令，如果不写，显示默认值（按钮label值，没有则为空）
// 实现多个按钮只写一个监听类
MyMonitor myMonitor = new MyMonitor();
button1.addActionListener(myMonitor);
button2.addActionListener(myMonitor);
frame.add(button1,BorderLayout.NORTH);
frame.add(button2,BorderLayout.SOUTH);
windowClose(frame);
frame.pack();
frame.setVisible(true);
}
//关闭窗体事件
private static void windowClose(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
//事件监听
class MyMonitor implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("按钮被点击：msg"+e.getActionCommand());
// if(e.getActionCommand().equals("start")){
// System.out.println("hahaha");
// }
// e.getActionCommand()获取按钮信息
}
}
2.5、输入框TextField监听
package com.wang.learn02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestText01 {
public static void main(String[] args) {
// 启动
new MyFrame();
}
}
class MyFrame extends Frame{
public MyFrame(){
TextField textField = new TextField();
add(textField);
//监听文本框输入的文字
// 按下Enter，就会触发输入框的事件
textField.addActionListener(new MyActionListener2());
// 设置替换编码
textField.setEchoChar('*');
setVisible(true);
pack();
windowClose(this);
}
private void windowClose(MyFrame myFrame) {
myFrame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class MyActionListener2 implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField field = (TextField) e.getSource();//获得一些资源,返回一个对象Object
System.out.println(field.getText());;//获得输入框中的文本
field.setText("");//回车后，文本框设为空
}
}
2.6、简易计算器，组合，内部类回顾复习
oop原则：组合大于继承
class A extends B{
}
class A{
public B b;
}
内部类：
- 更好的包装
package com.wang.learn02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TestCalc {
public static void main(String[] args) {
new Calculator().loadFrame();
}
}
//计算器类
class Calculator extends Frame{
//属性
TextField num1;
TextField num2;
TextField num3;
// 方法
public void loadFrame(){
//3 text
num1 = new TextField(10);//最大字符数
num2 = new TextField(10);//最大字符数
num3 = new TextField(10);//最大字符数
//1 button
Button button = new Button("=");
button.addActionListener(new MyCalculatorListener());
//1 label 用来写一些提示性东西
Label label = new Label("+");
//布局
setLayout(new FlowLayout());
add(num1);
add(label);
add(num2);
add(button);
add(num3);
pack();
setVisible(true);
}
public Calculator(){
}
//监听器类
//内部类最大的好处就是可以畅通无阻地访问外部类的属性和方法
private class MyCalculatorListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
//获得加数和被加数，
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
// 将值加法运算放到第三个框，
num3.setText(""+(n1+n2));
// 清除前两个
num1.setText("");
num2.setText("");
}
}
}
2.7、画笔
package com.wang.learn03;
import java.awt.*;
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);
}
//画笔
@Override
public void paint(Graphics g) {
// 画笔需要颜色，可以画画
g.setColor(Color.red);
// g.drawOval(100,100,100,100);
g.fillOval(100,100,100,100);//实心的圆
g.setColor(Color.green);
g.fillRect(200,200,100,100);
// 养成习惯，用完画笔，还原最初颜色
}
}
2.8、鼠标监听
目的：实现鼠标画画
package com.wang.learn03;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
public class TestMouseListener {
public static void main(String[] args) {
new MyFrame("画图");
}
}
//
class MyFrame extends Frame{
//画画需要画笔，监听当前鼠标位置，需要集合来存储这个点
ArrayList points;
public MyFrame(String title){
super(title);
setBounds(200,200,400,300);
// 存鼠标点击的 点
points = new ArrayList<>();
//鼠标监听器，针对该窗口
this.addMouseListener(new MyMouseListener());
setVisible(true);
}
@Override
public void paint(Graphics g) {
//画画，监听鼠标事件
Iterator iterator = points.iterator();
while(iterator.hasNext()){
Point point = (Point) iterator.next();
g.setColor(Color.blue);
g.fillOval(point.x,point.y,10,10);
}
}
//添加一个点到界面上
public void addPaint(Point point){
points.add(point);
}
private class MyMouseListener extends MouseAdapter{
//鼠标按下，弹起，按住不放
@Override
public void mousePressed(MouseEvent e) {
MyFrame myFrame = (MyFrame) e.getSource();
// 这里点击，就会在界面产生一个点！
//这个点就是鼠标的点
myFrame.addPaint(new Point(e.getX(), e.getY()));
//每次点击鼠标都重画一遍
myFrame.repaint();//刷新
}
}
}
2.9、窗口监听
package com.wang.learn03;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestWindow {
public static void main(String[] args) {
new WindowFrame();
}
}
class WindowFrame extends Frame{
public WindowFrame(){
setBackground(Color.red);
setBounds(200,200,400,300);
setVisible(true);
// addWindowListener(new MyWindowListener());
this.addWindowListener(new WindowAdapter() {
//匿名内部类
//关闭窗口
@Override
public void windowClosing(WindowEvent e) {
System.out.println("windowClosing");
System.exit(0);
}
//激活窗口
@Override
public void windowActivated(WindowEvent e) {
WindowFrame source = (WindowFrame) e.getSource();
source.setTitle("被激活了");
System.out.println("windowActivated");
}
});
}
}
2.10、键盘监听
package com.wang.learn03;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class TestKeyListener {
public static void main(String[] args) {
new KeyFrame();
}
}
class KeyFrame extends Frame{
public KeyFrame(){
setBounds(1,2,300,400);
setVisible(true);
addKeyListener(new KeyAdapter() {
//键盘按下
@Override
public void keyPressed(KeyEvent e) {
//获取键盘按下的是哪一个,当前的码
int keyCode = e.getKeyCode();//不需要记忆，直接使用静态属性VK_XXX
System.out.println(keyCode);
if(keyCode == KeyEvent.VK_UP){
System.out.println("你按下了上键");
}
//根据按下的不同键，实现不同的操作
}
});
}
}
3、Swing
3.1、窗口、面板
package com.wang.learn04;
import javax.swing.*;
import java.awt.*;
public class JFrameDemo02 {
public static void main(String[] args) {
new MyJFrame2().init();
}
}
class MyJFrame2 extends JFrame {
public void init(){
setVisible(true);
setBounds(10,10,200,300);
//设置文字 JLabel
JLabel label = new JLabel("Welcome to Java");
add(label);
//文本标签居中,设置水平对齐
label.setHorizontalAlignment(SwingConstants.CENTER);
//获得容器
Container contentPane = this.getContentPane();
contentPane.setBackground(Color.blue);
}
}
3.2、弹窗
JDialog，用来被弹出，默认有关闭事件
package com.wang.learn04;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//主窗口
public class DialogDemo extends JFrame {
public DialogDemo(){
this.setVisible(true);
this.setSize(700,500);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
//JFrame 放东西需要容器
Container container = this.getContentPane();
//绝对布局
container.setLayout(null);
//按钮
JButton button = new JButton("点击弹出一个对话框");
button.setBounds(30,30,200,50);
//点击这个按钮时，弹出弹窗
button.addActionListener(new ActionListener() {//监听器
@Override
public void actionPerformed(ActionEvent e) {
//弹窗
new MyDialogDemo();
}
});
container.add(button);
}
public static void main(String[] args) {
new DialogDemo();
}
}
//弹窗的窗口
class MyDialogDemo extends JDialog{
public MyDialogDemo(){
this.setVisible(true);
this.setBounds(100,100,500,500);
Container container = this.getContentPane();
//container.setLayout(null);
container.add(new JLabel("learn Java"));
}
}
3.3、标签
JLabel
new JLabel("xxx");
图标ICON，图片Icon
package com.wang.learn04;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class ImageIconDemo extends JFrame{
public ImageIconDemo(){
//
JLabel label = new JLabel("ImageIcon");
URL resource = ImageIconDemo.class.getResource("101.jpg");
ImageIcon imageIcon = new ImageIcon(resource);
label.setIcon(imageIcon);
label.setHorizontalAlignment(SwingConstants.CENTER);
Container contentPane = getContentPane();
contentPane.add(label);
setVisible(true);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setBounds(100,100,200,200);
}
public static void main(String[] args) {
new ImageIconDemo();
}
}
3.4、面板
JPanel
package learn05;
import javax.swing.*;
import java.awt.*;
public class JPanelDemo extends JFrame {
public JPanelDemo() {
Container container = this.getContentPane();
container.setLayout(new GridLayout(2,2, 10,10));//后面参数代表间距
JPanel panel1 = new JPanel(new GridLayout(1,3));
JPanel panel2 = new JPanel(new GridLayout(1,2));
JPanel panel3 = new JPanel(new GridLayout(2,1));
JPanel panel4 = new JPanel(new GridLayout(3,2));
panel1.add(new JButton("1"));
panel1.add(new JButton("1"));
panel1.add(new JButton("1"));
panel2.add(new JButton("2"));
panel2.add(new JButton("2"));
panel3.add(new JButton("3"));
panel3.add(new JButton("3"));
panel4.add(new JButton("4"));
panel4.add(new JButton("4"));
panel4.add(new JButton("4"));
panel4.add(new JButton("4"));
panel4.add(new JButton("4"));
panel4.add(new JButton("4"));
container.add(panel1);
container.add(panel2);
container.add(panel3);
container.add(panel4);
this.setVisible(true);
this.setBounds(200,200,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JPanelDemo();
}
}
JScrollPanel
package learn05;
import javax.swing.*;
import java.awt.*;
public class JScrollDemo extends JFrame {
public static void main(String[] args) {
new JScrollDemo();
}
public JScrollDemo() {
Container container = this.getContentPane();
//container.setLayout(null);
//文本域
JTextArea textArea = new JTextArea(20, 50);
textArea.setText("WELCOME TO JAVA");
//Scroll面板
JScrollPane scrollPane = new JScrollPane(textArea);
container.add(scrollPane);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setBounds(100,100,400,300);
}
}
3.5、按钮
package learn05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo01 extends JFrame{
public JButtonDemo01() {
Container container = this.getContentPane();
//将一个图片变成图标
URL url = JButtonDemo01.class.getResource("1.jpg");
Icon icon = new ImageIcon(url);
//图标放在按钮上
JButton button = new JButton();
button.setIcon(icon);
button.setToolTipText("图片按钮");//鼠标放上去提示的文本
//add
container.add(button);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
setBounds(200,200,400,300);
setResizable(false);
}
public static void main(String[] args) {
new JButtonDemo01();
}
}
- 单选按钮
package learn05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo02 extends JFrame {
public JButtonDemo02() {
Container container = this.getContentPane();
//将一个图片变成图标
URL url = JButtonDemo01.class.getResource("1.jpg");
Icon icon = new ImageIcon(url);
// 单选框
JRadioButton radioButton01 = new JRadioButton("01");
JRadioButton radioButton02 = new JRadioButton("02");
JRadioButton radioButton03 = new JRadioButton("03");
// 由于单选框只能选择一个，必须分组！！！！,一个组里面只能选一个
ButtonGroup group = new ButtonGroup();
group.add(radioButton01);
group.add(radioButton02);
group.add(radioButton03);
//add
container.add(radioButton01,BorderLayout.CENTER);
container.add(radioButton02,BorderLayout.NORTH);
container.add(radioButton03,BorderLayout.SOUTH);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
setBounds(200, 200, 400, 300);
setResizable(false);
}
public static void main(String[] args) {
new JButtonDemo02();
}
}
- 复选按钮
package learn05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo03 extends JFrame {
public JButtonDemo03() {
Container container = this.getContentPane();
//将一个图片变成图标
URL url = JButtonDemo01.class.getResource("1.jpg");
Icon icon = new ImageIcon(url);
//多选框
JCheckBox checkBox01 = new JCheckBox("01");
JCheckBox checkBox02 = new JCheckBox("02");
//add
container.add(checkBox01,BorderLayout.NORTH);
container.add(checkBox02,BorderLayout.SOUTH);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
setBounds(200, 200, 400, 300);
setResizable(false);
}
public static void main(String[] args) {
new JButtonDemo03();
}
}
3.6、列表
- 下拉框
package com.wang.learn06;
import javax.swing.*;
import java.awt.*;
public class TestComboboxDemo01 extends JFrame {
public TestComboboxDemo01() {
Container container = this.getContentPane();
JComboBox status = new JComboBox();
status.addItem(null);
status.addItem("正在上映");
status.addItem("已下架");
status.addItem("即将上映");
container.add(status);
this.setVisible(true);
this.setBounds(200,200,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TestComboboxDemo01();
}
}
- 列表框
package com.wang.learn06;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
public class TestComboboxDemo02 extends JFrame {
public TestComboboxDemo02() {
Container container = this.getContentPane();
//生成列表的内容
// String[] contents = {"1","2","3"};//放静态变量
Vector contents = new Vector();//动态变量
//列表需要放入内容
JList jList = new JList(contents);
contents.add("1");
contents.add("333");
contents.add("2323");
container.add(jList);
this.setVisible(true);
this.setBounds(200,200,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TestComboboxDemo02();
}
}
- 应用场景
- 选择地区，或者一个单个选项，两个用单选按钮，多于两个用下拉框
- 列表，展示一些信息，一般是动态扩容
3.7、文本框
- 文本框
package com.wang.learn06;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
public class TestTextDemo01 extends JFrame {
public TestTextDemo01() {
Container container = this.getContentPane();
// container.setLayout(null);
JTextField textField1 = new JTextField("hello");
JTextField textField2 = new JTextField("world",20);
container.add(textField1, BorderLayout.NORTH);
container.add(textField2, BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(200,200,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TestTextDemo01();
}
}
- 密码框
package com.wang.learn06;
import javax.swing.*;
import java.awt.*;
public class TestTextDemo02 extends JFrame {
public TestTextDemo02() {
Container container = this.getContentPane();
// container.setLayout(null);
//尽量在面板里，不要直接放在container里
JPasswordField passwordField = new JPasswordField();
//passwordField.setEchoChar('*');
container.add(passwordField);
this.setVisible(true);
this.setBounds(200,200,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TestTextDemo02();
}
}
- 文本域
package com.wang.learn05;
import javax.swing.*;
import java.awt.*;
public class JScrollDemo extends JFrame {
public static void main(String[] args) {
new JScrollDemo();
}
public JScrollDemo() {
Container container = this.getContentPane();
//container.setLayout(null);
//文本域
JTextArea textArea = new JTextArea(20, 50);
textArea.setText("WELCOME TO JAVA");
//Scroll面板
JScrollPane scrollPane = new JScrollPane(textArea);
container.add(scrollPane);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setBounds(100,100,400,300);
}
}
贪吃蛇
帧，如果时间足够小，就是动画，一秒30帧，60帧。连起来是动画，拆开来就是静态的图片
键盘监听
- 把键盘监听写在JFrame上可以直接用？？？
- 键盘监听写在JPanel上需要按下tab键才能跳转到面板上？？？（不确定）
- 好像把frame.setVisible(true);写在添加面板的语句后面就可以直接用了
定时器Timer
- 实现ActionListener接口，重写actionPerformed（）方法
- 初始化时，time.start(),在actionPerformed（）方法中也要time.start()，表示间隔多久执行一次actionPerformed（）方法
添加游戏中对象的方法：定义一个事物，初始化，放上去，监听它
相对路径：
注意：IDEA 中如果相对路径没有加/,则表示类所在包的目录，否则表示out/production/项目名/ 路径
思维导图总结：
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