java事件处理5（窗口，窗口坐监视器

WindowEvent窗口事件

添加接口

addWindowListener(WindowEvent e)

接口有七个方法

public void windowActivated(WindowEvent e)//非激活到激活
public void windowDeactivated(WindowEvent e)//激活到非激活
public void windowClosing(WindowEvent e)//正在被关闭
public void windowClosed(WindowEvent e)//关闭后
public void windowIconified(WindowEvent e)//图标化
public void windowDeiconified(WindowEvent e)//撤销图标化
public void WindowOpened(WindowEvent e)//窗口打开

老实讲上面的方法我也不太清楚什么时候调用，写起来又麻烦

java陪了一个WindowAdapter适配器给我们

WindowAdapter类实现了WindowListener接口的全部方法，我们自己需求的方法只要重写就好

所以我们只需继承WindowAdapter不需要自己实现啦WindowListener啦

class WinPolice extends WindowAdapter{
    public void  windowClosing(WindowEvent e){
        System.out.println("11");
    }
}

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窗口坐监视器

不用把组件作为参数组合进去，不过程序大的时候容易乱

写窗口的时候实现需要的监视器

class MyWin extends JFrame implements ActionListener{

然后就可以直接在类里面写方法

public void actionPerformed(ActionEvent e)

写个猜数字的测试代码

class MyWin extends JFrame implements ActionListener{
    int number;
    JTextField text1;
    JButton button1,button2;
    JLabel label1;
    MyWin(){
        init();
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    void init(){
        setLayout(new FlowLayout());
        button1=new JButton("get a ranbow number");
        button2=new JButton("go");
        label1=new JLabel("ready");
        text1=new JTextField(8);
        add(button1);
        add(label1);
        add(text1);
        add(button2);
        button1.addActionListener(this);
        button2.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e){
        if(e.getSource() ==button1){
            number=(int) (Math.random()*10)+1;
            System.out.println(number);
            label1.setText("guess");
        }
        if(e.getSource()==button2){
            int t=Integer.parseInt(text1.getText());
            System.out.println(t);
            if(t<number){
                label1.setText("bigger");
                text1.setText(null);
            }else if(t>number){
                label1.setText("smaller");
                text1.setText(null);
            }else
                label1.setText("bigo is "+number);
            
        }
        
    }
    
}