GUI编程 --2

GUI编程 --2

2.4 事件监听

按钮的使用。

package com.ssl.lesson02;
 
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，触发一些事件
        Frame frame =new Frame();
        Button button = new Button();
 
        //因为addActionListener需要一个实现类
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);
 
        frame.add(button);
 
        frame.setVisible(true);
 
        frame.setSize(400,400);
 
        windowsClose(frame);    //关闭窗口
    }
 
    //关闭窗体的事件
    private static void windowsClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}
 
class MyActionListener implements ActionListener{
 
    private static int a = 0 ;
 
    @Override
    public void actionPerformed(ActionEvent e) {
 
        System.out.println(++a);
    }
}

两个按钮绑定一个监听

package com.ssl.lesson02;
 
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 TestActionTwo {
    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("start");
        Button button2 =new Button("stop");
 
 
        frame.add(button1,BorderLayout.NORTH);
        frame.add(button2,BorderLayout.SOUTH);
 
        //设置了SetActioncommand的按钮，事件监听会读取到相应的内容。否则，会读取按钮的标签。
        button2.setActionCommand("Button2-stop");
 
        button1.addActionListener(new MyMonitor());
        button2.addActionListener(new MyMonitor());
 
        frame.setSize(500,500);
 
 
        frame.setVisible(true);
 
        windowsClose(frame);
 
    }
 
    //关闭窗体的事件
    private static void windowsClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}
 
class MyMonitor implements ActionListener {
 
    @Override
    public void actionPerformed(ActionEvent e) {
 
        System.out.println("按钮被点击了！"+e.getActionCommand());
 
    }
}

2.5输入框TextField 监听

package com.ssl.lesson02;
 
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 TextText01 {
    public static void main(String[] args) {
        //启动
        MyFrame frame = new MyFrame();
 
        frame.setSize(400,400);
 
        WindowsCloser(frame);
    }
 
    public static void  WindowsCloser(MyFrame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
 
}
 
class MyFrame extends Frame{
    public MyFrame(){
        TextField textField = new TextField();
        add(textField);
 
        //setSize(400,400);   
        //监听这个文本框输入的文件,按下回车就会触发这个输入框的事件。
        textField.addActionListener(new MyActionListener2());
 
        //设置替换编码
        textField.setEchoChar('*');
 
 
        setVisible(true);
 
        pack();   //自适应调整窗口大小
 
    }
}
 
class MyActionListener2 implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
        TextField field = (TextField) e.getSource();   //获得一些资源
        System.out.println(field.getText());
 
    }
 
}

2.6简易计算器，组合+内部类

OOP原则中，组合大于继承。

//继承
class A extend B{
    
}
 
//组合
class A{
	public B b;
}

计算器

//第一版代码
package com.ssl.lesson02;
 
import javax.crypto.interfaces.PBEKey;
import javax.swing.*;
import javax.xml.soap.Text;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
//简易计算器
public class TestCalc {
    public static void main(String[] args) {
        new Calculator();
    }
}
 
//计算器类
class Calculator extends  Frame{
    public Calculator(){
        setTitle("Calculator");
        //3个文本框
        TextField textField1 = new TextField(10);
        TextField textField2 = new TextField(10);
        TextField textField3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener(textField1,textField2,textField3));
 
        //一个标签
        Label label = new Label("+");
 
        //设置布局
        setLayout(new FlowLayout());
 
        //加元素
        add(textField1);
        add(label);
        add(textField2);
        add(button);
        add(textField3);
 
        setVisible(true);
 
        setBounds(400,400,600,400);
 
        setSize(600,100);
 
        widowsCloser(this);
    }
    public static void widowsCloser(Calculator calculator){
        calculator.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
 
 
}
 
 
 
 
//监听器类  监听输入框
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;
    }
 
    @Override
    public void actionPerformed(ActionEvent e) {
        /**
         * 1.获得加数和被加数
         * 2.将这个值+法运算后，放到第三个框
         * 3.清除前两个框
         */
 
        //获取前第一个框和第二框，并转为int
        int n1 = Integer.parseInt(num1.getText());
        int n2 = Integer.parseInt(num2.getText());
 
        num3.setText(" "+(n1+n2));
        num1.setText("");
        num2.setText("");
 
    }
}

完全改造为面向对象

package com.ssl.lesson02;
 
import javax.crypto.interfaces.PBEKey;
import javax.swing.*;
import javax.xml.soap.Text;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
//简易计算器
public class TestCalc {
    public static void main(String[] args) {
        new Calculator();
    }
}
 
//计算器类
class Calculator extends  Frame{
    //属性
    TextField num1,num2,num3;
    
    public Calculator(){
        setTitle("Calculator");
        //3个文本框
        num1 = new TextField(10);
        num2 = new TextField(10);
        num3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener(this));
 
        //一个标签
        Label label = new Label("+");
 
        //设置布局
        setLayout(new FlowLayout());
 
        //加元素
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
 
        setVisible(true);
 
        setBounds(400,400,600,400);
 
        setSize(600,100);
 
        widowsCloser(this);
    }
    public static void widowsCloser(Calculator calculator){
        calculator.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
 
 
}
 
 
 
 
//监听器类  监听输入框
class MyCalculatorListener implements ActionListener{
    //获取计算器在这个对象,在一个类中组合另外一个类
    Calculator calculator = null;
 
 
    public MyCalculatorListener(Calculator calculator){
        this.calculator=calculator;
    }
 
    @Override
    public void actionPerformed(ActionEvent e) {
        /**
         * 1.获得加数和被加数
         * 2.将这个值+法运算后，放到第三个框
         * 3.清除前两个框
         */
 
        //获取前第一个框和第二框，并转为int
        int n1 = Integer.parseInt(calculator.num1.getText());
        int n2 = Integer.parseInt(calculator.num2.getText());
 
        calculator.num3.setText(" "+(n1+n2));
        calculator.num1.setText("");
        calculator.num2.setText("");
 
    }
}

内部类：

小tip：null 不等于"";

package com.ssl.lesson02;
 
import javax.crypto.interfaces.PBEKey;
import javax.swing.*;
import javax.xml.soap.Text;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
//简易计算器
public class TestCalc {
    public static void main(String[] args) {
        new Calculator();
    }
}
 
//计算器类
class Calculator extends  Frame{
    //属性
    TextField num1,num2,num3;
 
    public Calculator(){
        setTitle("Calculator");
        //3个文本框
        num1 = new TextField(10);
        num2 = new TextField(10);
        num3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener());
 
        //一个标签
        Label label = new Label("+");
 
        //设置布局
        setLayout(new FlowLayout());
 
        //加元素
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
 
        setVisible(true);
 
        setBounds(400,400,600,400);
 
        setSize(600,100);
 
        widowsCloser(this);
    }
    public static void widowsCloser(Calculator calculator){
        calculator.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
 
    //监听器类  监听输入框   内部类
    private class MyCalculatorListener implements ActionListener{
 
 
        @Override
        public void actionPerformed(ActionEvent e) {
            /**
             * 1.获得加数和被加数
             * 2.将这个值+法运算后，放到第三个框
             * 3.清除前两个框
             */
            if(((String)num1.getText()).length() == 0 ||"".equals((String)num2.getText()) ){
                num1.setText("0");
                num2.setText("0");
                num3.setText("0");
                return ;
            }
 
 
            //获取前第一个框和第二框，并转为int
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());
 
 
 
            num3.setText(" "+(n1+n2));
            num1.setText("");
            num2.setText("");
 
        }
    }
}

2.7画笔Paint

package com.ssl.lesson03;
 
import javafx.beans.binding.SetBinding;
 
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
    public void paint(Graphics g){
        //画笔，需要有颜色，画笔可以画画
        //设置颜色
        g.setColor(Color.red);
        //空心圆
        g.drawOval(100,100,100,100);
 
        g.setColor(Color.orange);
        //实心圆
        g.fillOval(200,200,100,100);
 
        //养成习惯，画笔完，将他还原为最初的颜色
 
    }
}

2.8 鼠标监听

  • 画板 与画笔绑定
  • 画笔 读x y
  • 鼠标：监听事件 x，y 读完然后repaint（）；
  • 存点的集合：存x y
package com.ssl.lesson03;
 
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("point");
    }
}
 
//自己的类
class MyFrame extends Frame {
    //画画需要画笔，需要监听鼠标当前的位置，需要集合来存储这个点
    ArrayList points;
 
    public MyFrame(String title) {
        super(title);
        setBounds(200, 200, 400, 300);
        //鼠标的监听器
        this.addMouseListener(new MyMouseListener());
        //存鼠标点击的点
        points = new ArrayList<>();
 
        setVisible(true);
    }
 
    public void paint(Graphics g) {
        //画画，监听鼠标的事件
        //用迭代器去取
        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 addPoint(Point point) {
        points.add(point);
    }
 
 
    private class MyMouseListener extends MouseAdapter {
        //鼠标按下
        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame frame = (MyFrame) e.getSource();
            //这样我们点击的时候就会产生一个点
            frame.addPoint(new Point(e.getX(), e.getY()));
            //这个点就是我们鼠标的点
 
            //每次点击都要重新画一次
            frame.repaint();
        }
    }
}

2.9窗口监听

推荐使用匿名内部类

package com.ssl.lesson03;
 
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);
 
        this.addWindowListener(
                //匿名内部类
                new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        System.out.println("你点击了关闭");
                    }
                }
        );
 
    }
 
}

2.10键盘监听

package com.ssl.lesson03;
 
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(100, 100, 200, 200);
        setVisible(true);
 
        this.addKeyListener(new KeyAdapter() {
            //键盘按下
            @Override
            public void keyPressed(KeyEvent e) {
                //键盘按下的键是哪一个
                int keyCode = e.getKeyCode();//获取当前键盘的码
                System.out.println(keyCode);  //不需要记住，直接使用VK_XXX
                if (keyCode == KeyEvent.VK_UP) {
                    System.out.println("你按下了上键");
                }
                //根据按下的键，产生不同的结果
            }
        });
    }
}
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