1.GUI 编程简介
GUI：图形用户界面
GUI 核心技术：Swing、Awt 类
- 界面不美观
- 需要 jre 环境
为什么要学习：
- 可以写出一些小工具
- 工作时候，也可能需要维护到 Swing 界面，概率绩效
- 了解 MVC 架构，了解监听
2.AWT 类
2.1.Awt 介绍
包含了很多类和接口
元素：窗口、按钮、文本框
java.awt 包
2.2.组件和容器
2.2.1.弹框
Frame：弹出一个框
import java.awt.*;//GUI 的第一个界面
public class TestFrame {public static void main(String[] args) {//FrameFrame 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(126, 193, 129));//弹出的初始位置frame.setLocation(200, 200);//设置大小固定frame.setResizable(false);}
}
弹出多个框：
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.green);}
}
class MyFrame extends Frame{static int id = 0;//可能存在多个窗口，我们需要一个计数器public MyFrame(int x, int y, int w, int h,Color color){super("MyFrame" + (++id));setBackground(color);setBounds(x,y,w,h);setVisible(true);}
}
2.2.2.面板-Panel
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;//Panel 面板，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);//坐标frame.setBounds(300, 300, 500, 500);frame.setBackground(new Color(76, 185, 185));//Panel 设置坐标，相对 framepanel.setBounds(50, 50, 400, 400);panel.setBackground(new Color(250, 151, 151));//frame.add(panel)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() {//窗口点击关闭的时候需要做的事情@Overridepublic void windowClosing(WindowEvent e) {//结束程序System.exit(0);}});}
}
2.2.3.布局管理器
流式布局-FlowLayout
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;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());//设置靠左frame.setLayout(new FlowLayout(FlowLayout.LEFT));frame.setSize(200, 200);//把按钮添加上去frame.add(button1);frame.add(button2);frame.add(button3);frame.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {System.exit(0);}});frame.setVisible(true);}
}
东西南北中-BorderLayout
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;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.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {System.exit(0);}});frame.setVisible(true);}
}
表格布局-GridLayout
import java.awt.*;public class TestGridLayout {public static void main(String[] args) {Frame frame = new Frame("TestBorderLayout");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));//3行2列frame.add(btn1);frame.add(btn2);frame.add(btn3);frame.add(btn4);frame.add(btn5);frame.add(btn6);frame.pack();//将布局自动选择合适的布局frame.setVisible(true);}
}
练习：
import java.awt.*;public class ExDemo {public static void main(String[] args) {//总 frameFrame frame = new Frame();frame.setSize(400, 300);frame.setLocation(300, 400);
// frame.setBackground(Color.blue);frame.setVisible(true);frame.setLayout(new GridLayout(2, 1));//4个面板Panel p1 = new Panel(new BorderLayout());Panel p2 = new Panel(new GridLayout(2, 1));Panel p3 = new Panel(new BorderLayout());Panel p4 = new Panel(new GridLayout(2, 2));//上面面板p1.add(new Button("East-1"), BorderLayout.EAST);p1.add(new Button("West-1"), BorderLayout.WEST);p2.add(new Button("p2-btn-1"));p2.add(new Button("p2-btn-2"));p1.add(p2, BorderLayout.CENTER);//下面面板p3.add(new Button("East-2"), BorderLayout.EAST);p3.add(new Button("West-2"), BorderLayout.WEST);//中间4个for (int i = 0; i < 4; i++) {p4.add(new Button("for-"+(i+1)));}p3.add(p4, BorderLayout.CENTER);frame.add(p1);frame.add(p3);}
}
2.3.事件监听
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) {//按下按钮，触发一些事情Frame frame = new Frame();Button button = new Button();//因为 addActionListener() 需要一个 ActionListener，所以需要一个 ActionListenerMyActionListener myActionListener = new MyActionListener();button.addActionListener(myActionListener);frame.add(button,BorderLayout.CENTER);frame.pack();windowClose(frame);frame.setVisible(true);}//关闭窗体的事件private static void windowClose(Frame frame){frame.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {System.exit(0);}});}
}
//事件监听
class MyActionListener implements ActionListener{@Overridepublic void actionPerformed(ActionEvent e) {System.out.println("aaa");}
}
多个按钮共享一个事件：
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class TestActionDemo2 {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 start = new Button("start");Button stop = new Button("stop");//可以显示地定义触发会返回的命令，如果不显示定义，则会走默认的值//可以多个按钮只写一个监听类stop.setActionCommand("btn2-stop");MyListener myListener = new MyListener();start.addActionListener(myListener);stop.addActionListener(myListener);frame.add(start, BorderLayout.NORTH);frame.add(stop,BorderLayout.SOUTH);frame.pack();frame.setVisible(true);}
}
class MyListener implements ActionListener{@Overridepublic void actionPerformed(ActionEvent e) {//e.getActionCommand()：获得按钮的信息System.out.println("按钮被点击了：msg=>"+e.getActionCommand());}
}
2.4.输入框 TextField
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class TestText01 {public static void main(String[] args) {new MyFrame();}
}
class MyFrame extends Frame{public MyFrame(){TextField textField = new TextField();add(textField);//监听这个文本框输入的文字MyActionListener myActionListener = new MyActionListener();//按下 Enter，就会触发这个输入框的事件textField.addActionListener(myActionListener);//设置替换编码textField.setEchoChar('*');setVisible(true);pack();}
}
class MyActionListener implements ActionListener{@Overridepublic void actionPerformed(ActionEvent e) {TextField field = (TextField) e.getSource();//获得一些资源，返回的一个对象System.out.println(field.getText());//获得输入框的文本field.setText("");//回车置空}
}
2.5.简易计算器，组合+内部类
简易计算器
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class TestCalc {public static void main(String[] args) {new Calculator();}
}
//计算器类
class Calculator extends Frame{public Calculator(){//3个文本框TextField num1 = new TextField(10);//字符数TextField num2 = new TextField(10);//字符数TextField num3 = new TextField(10);//字符数//1个按钮Button button = new Button("=");button.addActionListener(new MyCalculatorListener(num1, num2, num3));//1个标签Label label = new Label("+");//布局setLayout(new FlowLayout());add(num1);add(label);add(num2);add(button);add(num3);pack();setVisible(true);}
}
//监听器类
class MyCalculatorListener implements ActionListener{//获取三个变量private TextField num1,num2,num3;public MyCalculatorListener(TextField num1,TextField num2,TextField num3){this.num1 = num1;this.num2 = num2;this.num3 = num3;}@Overridepublic void actionPerformed(ActionEvent e) {//1.获取加数和被加数int n1 = Integer.parseInt(num1.getText());int n2 = Integer.parseInt(num2.getText());//2.加法运算后放到第三个框num3.setText(""+(n1+n2));//3.清除前两个框num1.setText("");num2.setText("");}
}
完全面向对象改造
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, num2, num3;//方法public void loadFrame(){//3个文本框num1 = new TextField(10);//字符数num2 = new TextField(10);//字符数num3 = new TextField(10);//字符数//1个按钮Button button = new Button("=");//1个标签Label label = new Label("+");button.addActionListener(new MyCalculatorListener(this));//布局setLayout(new FlowLayout());add(num1);add(label);add(num2);add(button);add(num3);pack();setVisible(true);}
}
//监听器类
class MyCalculatorListener implements ActionListener{//获取计算器这个对象，在一个类中组合另外一个类Calculator calculator = null;public MyCalculatorListener(Calculator calculator){this.calculator = calculator;}@Overridepublic void actionPerformed(ActionEvent e) {//1.获取加数和被加数int n1 = Integer.parseInt(calculator.num1.getText());int n2 = Integer.parseInt(calculator.num2.getText());//2.加法运算后放到第三个框calculator.num3.setText(""+(n1+n2));//3.清除前两个框calculator.num1.setText("");calculator.num2.setText("");}
}
改造为内部类
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, num2, num3;//方法public void loadFrame(){//3个文本框num1 = new TextField(10);//字符数num2 = new TextField(10);//字符数num3 = new TextField(10);//字符数//1个按钮Button button = new Button("=");//1个标签Label label = new Label("+");button.addActionListener(new MyCalculatorListener());//布局setLayout(new FlowLayout());add(num1);add(label);add(num2);add(button);add(num3);pack();setVisible(true);}//监听器类//内部类最大的好处，就是可以畅通地访问外部的属性和方法private class MyCalculatorListener implements ActionListener{@Overridepublic void actionPerformed(ActionEvent e) {//1.获取加数和被加数int n1 = Integer.parseInt(num1.getText());int n2 = Integer.parseInt(num2.getText());//2.加法运算后放到第三个框num3.setText(""+(n1+n2));//3.清除前两个框num1.setText("");num2.setText("");}}
}
2.6.画笔
画圆
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@Overridepublic void paint(Graphics g) {//画笔，需要有颜色，可以画画g.setColor(Color.red);//g.drawOval(100,100,100,100);//画空心圆g.fillOval(100, 100, 100, 100);//实心圆//画笔用完，将其还原到最初的颜色g.setColor(Color.black);//黑色}
}
2.7.鼠标监听
目的：实现鼠标画画
鼠标点击一次画一个点
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");}
}
//自己的类
class MyFrame extends Frame{//画画需要画笔，需要监听鼠标当前的伪造，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<>();setVisible(true);//鼠标监听器，针对该窗口的this.addMouseListener(new MyMouseListener());}@Overridepublic void paint(Graphics g) {//画画，监听鼠标的事件Iterator iterator = points.iterator();while (iterator.hasNext()){Point point = (Point) iterator.next();//指针指向下一个，返回当前的点g.setColor(Color.blue);g.fillOval(point.x, point.y, 10, 10);}}//添加一个点到界面上public void addPoint(Point point){points.add(point);}//适配器模式private class MyMouseListener extends MouseAdapter{//鼠标 按下、弹起、按住不妨@Overridepublic void mousePressed(MouseEvent e) {MyFrame frame = (MyFrame) e.getSource();//点击鼠标的时候，就会在界面上产生一个点//这个点就是鼠标的点frame.addPoint(new Point(e.getX(), e.getY()));//每次点击鼠标都需要重新画一遍frame.repaint();//刷新}}
}
2.8.窗口监听
常用两种窗口监听
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.blue);setBounds(100, 100, 200, 200);setVisible(true);//匿名内部类this.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {System.out.println("窗口关闭");System.exit(0);}@Overridepublic void windowActivated(WindowEvent e) {//窗口激活WindowFrame source = (WindowFrame) e.getSource();source.setTitle("被激活了");System.out.println("windowActivated");}});}
}
2.9.键盘监听
点击查看代码
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;public class TestKeyListener {public static void main(String[] args) {}
}
class KeyFrame extends Frame{public KeyFrame(){setBounds(1, 2, 300, 400);setVisible(true);this.addKeyListener(new KeyAdapter() {//键盘按下@Overridepublic void keyPressed(KeyEvent e) {//获得键盘下的键是哪一个，当前的码int keyCode = e.getKeyCode();//不需要记录该数值，直接使用静态属性：VK_xxxif (keyCode == KeyEvent.VK_UP){System.out.println("你按下了上建");}//根据按下不同操作，产生不同的结果}});}
}
3.Swing 类
3.1.窗口
窗口
import javax.swing.*;
import java.awt.*;public class JFrameDemo {//init(); 初始化public void init(){//顶级窗口JFrame jf = new JFrame("这是一个JFrame窗口");jf.setVisible(true);jf.setBounds(100, 100, 200, 200);//设置文字 JLabelJLabel label = new JLabel("Hello world");jf.add(label);//文本居中label.setHorizontalAlignment(SwingConstants.CENTER);//获得容器Container contentPane = jf.getContentPane();contentPane.setBackground(Color.BLUE);//关闭事件jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {//建立一个窗口new JFrameDemo().init();}
}
3.2.弹窗
弹窗代码
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class DialogDemo extends JFrame {public DialogDemo() {this.setVisible(true);this.setSize(700, 500);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);//JFrame 放东西，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");//创建button.setBounds(30, 30, 200, 50);//点击这个按钮的时候，弹窗button.addActionListener(new ActionListener() {@Overridepublic 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);//默认就有关闭事件//this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);Container container = this.getContentPane();container.setLayout(null);container.add(new Label("弹窗标题"));}
}
3.3.标签
label
new JLabel("xxx");
图标ICON
import javax.swing.*;
import java.awt.*;//图标，需要实现类，Frame继承
public class IconDemo extends JFrame implements Icon {private int width;private int height;public IconDemo() {}public IconDemo(int width, int height) {this.width = width;this.height = height;}public void init(){IconDemo iconDemo = new IconDemo(15, 15);//图标放在标签，也可以放在按钮上JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);Container container = getContentPane();container.add(label);this.pack();this.setVisible(true);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new IconDemo().init();}@Overridepublic void paintIcon(Component c, Graphics g, int x, int y) {g.fillOval(x, y, width, height);}@Overridepublic int getIconWidth() {return this.width;}@Overridepublic int getIconHeight() {return this.height;}
}
图片ICON
import javax.swing.*;
import java.awt.*;
import java.net.URL;public class ImageIconDemo extends JFrame {public static void main(String[] args) {new ImageIconDemo();}public ImageIconDemo(){//获取图片的地址JLabel label = new JLabel("ImageIconDemo");URL url = ImageIconDemo.class.getResource("text.jpg");ImageIcon imageIcon = new ImageIcon(url);label.setIcon(imageIcon);label.setHorizontalAlignment(SwingConstants.CENTER);Container container = getContentPane();container.add(label);setVisible(true);setBounds(100, 100, 200, 200);setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}
}
3.4.面板
JPanel
面板操作
import javax.swing.*;
import java.awt.*;public class JPanelDemo extends JFrame {public JPanelDemo(){Container container = this.getContentPane();container.setLayout(new GridLayout(2, 1, 10, 10));//各个面板之间的间距：10JPanel panel1 = new JPanel(new GridLayout(1, 3));panel1.add(new JButton("1"));panel1.add(new JButton("1"));panel1.add(new JButton("1"));container.add(panel1);this.setVisible(true);this.setSize(500, 500);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new JPanelDemo();}
}
JScrollPane
滚动条面板
import javax.swing.*;
import java.awt.*;public class JPanelDemo extends JFrame {public JPanelDemo(){Container container = this.getContentPane();container.setLayout(new GridLayout(2, 1, 10, 10));//各个面板之间的间距：10JPanel panel1 = new JPanel(new GridLayout(1, 3));panel1.add(new JButton("1"));panel1.add(new JButton("1"));panel1.add(new JButton("1"));container.add(panel1);this.setVisible(true);this.setSize(500, 500);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new JPanelDemo();}
}
3.5.按钮
3.5.1.图片按钮
点击查看代码
import javax.swing.*;
import java.awt.*;
import java.net.URL;public class JButtonDemo extends JFrame {public JButtonDemo(){Container container = this.getContentPane();//将一个图片变为图标URL resource = JButtonDemo.class.getResource("tx.jpg");ImageIcon icon = new ImageIcon(resource);//把这个图标放在按钮上JButton button = new JButton();button.setIcon(icon);button.setToolTipText("图标按钮");//addcontainer.add(button);this.setVisible(true);this.setSize(500, 300);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new JButtonDemo();}
}
3.5.2.单选按钮
点击查看代码
import javax.swing.*;
import java.awt.*;public class JButtonDemo2 extends JFrame {public JButtonDemo2(){Container container = this.getContentPane();//单选框JRadioButton radioButton1 = new JRadioButton("JRadioButton1");JRadioButton radioButton2 = new JRadioButton("JRadioButton2");JRadioButton radioButton3 = new JRadioButton("JRadioButton3");//设置只能选择一个，分组ButtonGroup group = new ButtonGroup();group.add(radioButton1);group.add(radioButton2);group.add(radioButton3);container.add(radioButton1,BorderLayout.CENTER);container.add(radioButton2,BorderLayout.NORTH);container.add(radioButton3,BorderLayout.SOUTH);this.setVisible(true);this.setSize(500, 300);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new JButtonDemo2();}
}
3.5.3.复选按钮
点击查看代码
import javax.swing.*;
import java.awt.*;public class JButtonDemo3 extends JFrame {public JButtonDemo3(){Container container = this.getContentPane();//多选框JCheckBox checkBox1 = new JCheckBox("checkBox1");JCheckBox checkBox2 = new JCheckBox("checkBox2");container.add(checkBox1,BorderLayout.NORTH);container.add(checkBox2,BorderLayout.SOUTH);this.setVisible(true);this.setSize(500, 300);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new JButtonDemo3();}
}
3.6.列表
3.6.1.下拉框
点击查看代码
import javax.swing.*;
import java.awt.*;public class TestComboboxDemo extends JFrame {public TestComboboxDemo(){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.setSize(500, 300);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new TestComboboxDemo();}
}
3.6.2.列表框
点击查看代码
import javax.swing.*;
import java.awt.*;
import java.util.Vector;public class TestComboboxDemo2 extends JFrame {public TestComboboxDemo2(){Container container = this.getContentPane();//生成列表内容//String[] contents = {"1","2","3"};//静态写死Vector contents = new Vector();//列表中需要放入内容JList jList = new JList(contents);//动态添加contents.add("zhangsan");contents.add("wangwu");contents.add("lisi");container.add(jList);this.setVisible(true);this.setSize(500, 300);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new TestComboboxDemo2();}
}
3.6.3.应用场景
下拉框：选择地区，或一些单个选项
列表：展示信息，一般是动态扩容
3.7.文本框
3.7.1.文本框
点击查看代码
import javax.swing.*;
import java.awt.*;public class TestTextDemo1 extends JFrame {public TestTextDemo1(){Container container = this.getContentPane();JTextField textField1 = new JTextField("hello");JTextField textField2 = new JTextField("world", 20);container.add(textField1,BorderLayout.SOUTH);container.add(textField2,BorderLayout.NORTH);this.setVisible(true);this.setSize(500, 350);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new TestTextDemo1();}
}
3.7.2.密码框
点击查看代码
import javax.swing.*;
import java.awt.*;public class TestTextDemo2 extends JFrame {public TestTextDemo2(){Container container = this.getContentPane();JPasswordField passwordField = new JPasswordField();passwordField.setEchoChar('*');container.add(passwordField);this.setVisible(true);this.setSize(500, 350);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new TestTextDemo2();}
}
3.7.3.文本域
点击查看代码
import javax.swing.*;
import java.awt.*;public class TestTextDemo3 extends JFrame {public TestTextDemo3(){Container container = this.getContentPane();//文本域JTextArea textArea = new JTextArea(20, 30);textArea.setText("这是默认字符");//Scroll面板JScrollPane scrollPane = new JScrollPane(textArea);container.add(scrollPane);this.setVisible(true);this.setSize(500, 350);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {new TestTextDemo3();}
}
4.贪吃蛇小游戏
帧：如果时间片足够小，就是动画，一秒30、60帧，拆开就是静态的图片
键盘监听
定时器：Timer
图片资源及源代码：贪吃蛇代码
