GUI-study （三）_牛客博客

AWT --（二）

***监听

事件监听：当某个事情发生的时候，干什么？

package com.kuang.lesson02;

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

import static javax.print.attribute.standard.MediaSizeName.A;

public class TestActionEvent {
    public static void main(String[] args) {
        //按下按钮触发事情
        Frame frame = new Frame();
        Button button = new Button();

        //因为addActionListener需要一个ActionListener，所以我们需要构造一个ActionListener
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);

        frame.add(button,BorderLayout.CENTER);
        frame.pack();  //自适应

        windowClose(frame);
        frame.setVisible(true);

    }

    //关闭窗体的事件
    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");
    }
}

多个按钮共享一个事件

package com.kuang.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 TestActionEvent02 {
    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();
        Button btn1 = new Button("start");
        Button btn2 = new Button("close");

        //可以显示的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
        btn1.setActionCommand("button2-stop");

        MyMonitor myMonitor = new MyMonitor();

        btn1.addActionListener(myMonitor);
        btn2.addActionListener(myMonitor);

        frame.add(btn1,BorderLayout.NORTH);
        frame.add(btn2,BorderLayout.SOUTH);

        frame.pack();
        frame.setVisible(true);
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

    }
}

class MyMonitor implements ActionListener{

    @Override
    public 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());
        if (e.getActionCommand().equals("start")){
            System.out.println("可以进行一些操作");
        }
    }
}

5.输入框TextField 监听

calc==>计算器

package com.kuang.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 TestText {
    public static void main(String[] args) {
        //启动
        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
        MyActionListener2 myActionListener2 = new MyActionListener2();
        //按下enter就会触发这个输入框的事件
        textField.addActionListener(myActionListener2);

        //设置编码
        textField.setEchoChar('*');

        setVisible(true);
        pack();

        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,可以向下转型
        System.out.println(field.getText());  //获得输入框中的文本
        field.setText("");  //null ""

    }
}

6.简易计算器，组合+内部类回顾复习！

oop原则：组合>继承！

class A extends B{

}
class A{
    public B b;
}

完全改造为面向对象写法

package com.kuang.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 TestCalculator {
    public static void main(String[] args) {
        new Calculator().loadFrame();  //面向对象，标准的对象.方法
    }


}

//计算器类
class Calculator extends Frame{
    //属性
    TextField num1,num2,num3;
    //方法
    public void loadFrame(){
        num1 = new TextField(10); //字符数
        num2 = new TextField(10);
        num3 = new TextField(20);
        Button button = new Button("=");
        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);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

}

//***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;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        //获得加数与被加数
        int n1 = Integer.parseInt(calculator.num1.getText());
        int n2 = Integer.parseInt(calculator.num2.getText());
        //将这个值+运算后放到第三个框
        calculator.num3.setText(""+(n1+n2));
        //清除前两个框
        calculator.num1.setText("");
        calculator.num2.setText("");
    }

    /*面向过程//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) {
        //获得加数和被加数
        int n1 = Integer.parseInt(num1.getText());
        int n2 = Integer.parseInt(num2.getText());

        //将这个值加法运算后放到第三个框
        num3.setText(""+(n1+n2));

        //清除前两个框
        num1.setText("");
        num2.setText("");
    }*/
}

内部类

更好的包装
最大好处：畅通无阻的访问外部的属性和方法

package com.kuang.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 TestCalculator {
    public static void main(String[] args) {
        new Calculator().loadFrame();  //面向对象，标准的对象.方法
    }


}

//计算器类
class Calculator extends Frame{
    //属性
    TextField num1,num2,num3;
    //方法
    public void loadFrame(){
        num1 = new TextField(10); //字符数
        num2 = new TextField(10);
        num3 = new TextField(20);
        Button button = new Button("=");
        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);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    //内部类
    //***类
    private class MyCalculatorListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            //获得加数与被加数
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());
            //将这个值+运算后放到第三个框
            num3.setText(""+(n1+n2));
            //清除前两个框
            num1.setText("");
            num2.setText("");
        }

    }

}

7.画笔

package com.kuang.lesson03;

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

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);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    @Override
    public 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);
        g.fillOval(100,100,100,100);
        g.setColor(Color.green);
        g.fillRect(150,200,200,200);

        //养成习惯，画笔用完，将他还原为最初的颜色

    }
}

8.鼠标监听

目的：想要实现鼠标画画

package com.kuang.lesson03;

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Iterator;

//鼠标监听事件
public class TestMouseListener {
    public static void main(String[] args) {
        new MyFrame("画图***Paint");
    }
}
//自己的类
class MyFrame extends Frame{
    //画画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);

        //存鼠标的点
        points = new ArrayList<>();


        setVisible(true);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        //鼠标***,正对这个窗口
        this.addMouseListener(new MyMouseListener());

    }

    @Override
    public 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();
            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);
    }
    //适配器模式
    private class MyMouseListener extends MouseAdapter{
        //鼠标 按下，弹起，按下不放

        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame myFrame = (MyFrame) e.getSource();
            //这个我们点击的时候，就会在界面上产生一个点，就是鼠标的点
            myFrame.addPaint(new Point(e.getX(),e.getY()));

            //每次点击鼠标都需要重画一遍
            myFrame.repaint();
        }
    }
}

9.窗口监听

package com.kuang.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);
        //内部类addWindowListener(new MyWindowListener());
        this.addWindowListener(
                //匿名内部类
                new WindowAdapter() {
                    //关闭窗口
                    @Override
                    public void windowClosing(WindowEvent e) {
                        System.out.println("windowClosing");
                    }
                    //激活窗口
                    @Override
                    public void windowActivated(WindowEvent e) {
                        System.out.println("windowActivated");
                    }
                }
        );

    }

    /*内部类
    class MyWindowListener extends WindowAdapter{
        @Override
        public void windowClosing(WindowEvent e) {
            setVisible(false);  //隐藏窗口，通过按钮
            System.exit(0);  //正常退出，非正常，把0-->1
        }
    }*/
}

10.键盘监听

package com.kuang.lesson03;

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

//键
public class TestKeyListenerr {
    public static void main(String[] args) {
        new KeyFrame();


    }
}

class KeyFrame extends Frame {
    public KeyFrame(){
        //默认的super();
        setBounds(1,2,300,400);
        setVisible(true);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                //键盘按下的键是哪一个，当前的码
                int keyCode = e.getKeyCode();  //不需要去记录这个数值，直接使用静态属性VK_XXX
                System.out.println(keyCode);
                if(keyCode==KeyEvent.VK_UP){
                    System.out.println("Pressed UP");
                }
                //根据按下不同的操作，产生不同的结果
            }
        });
    }
}