GUI02

2、面板Panel

解决了关闭窗口事件

public class TestPanel {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Panel panel = new Panel();

        //设置布局
        frame.setLayout(null);

        //坐标背景
        frame.setBounds(300,300,500,500);
        frame.setBackground(new Color(117, 195, 202));

        //panel设置坐标 背景
        panel.setBounds(50,50,400,400);
        panel.setBackground(new Color(202, 89, 161));

        frame.add(panel);
        frame.setVisible(true);

        //监听事件，监听窗口关闭事件 System.exit(0)
        //适配器：
        frame.addWindowListener(new WindowAdapter() {
            //窗口点击需要做的事情
            @Override
            public void windowClosing(WindowEvent e) {
                //结束程序
                System.exit(0);
            }
        });
    }
}

#### 3、布局管理器

• 流式布局

public class TestFlowLayout {
    public static void main(String[] args) {
        Frame frame = new Frame();
        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.CENTER));
        frame.setSize(200,200);
        frame.add(button1);
        frame.add(button2);
        frame.add(button3);
        frame.setVisible(true);
    }
}

• 东西南北中

public class TestBorderLayout {
    public static void main(String[] args) {
        Frame frame = new Frame("BorderLayout");
        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

public class TestGridLayout {
    public static void main(String[] args) {
        Frame frame = new Frame("GridLayout");
        Button button1 = new Button("button1");
        Button button2 = new Button("button2");
        Button button3 = new Button("button3");
        Button button4 = new Button("button4");
        Button button5 = new Button("button5");
        Button button6 = new Button("button6");
        frame.setLayout(new GridLayout(3,2));
        frame.add(button1);
        frame.add(button2);
        frame.add(button3);
        frame.add(button4);
        frame.add(button5);
        frame.add(button6);
        frame.pack();//java函数，自动填充
        frame.setVisible(true);
    }
}

练习：

public class Demo {
    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.setLayout(new GridLayout(2,1));
        Panel p1 = new Panel(new BorderLayout());
        p1.add(new Button("East-1"),BorderLayout.EAST);
        p1.add(new Button("West-1"),BorderLayout.WEST);
        Panel p2 = new Panel();
        p2.setLayout(new GridLayout(2,1));
        p2.add(new Button("top-nor"));
        p2.add(new Button("top-sou"));
        p1.add(p2,BorderLayout.CENTER);
        Panel p3 = new Panel(new BorderLayout());
        p3.add(new Button("East-2"),BorderLayout.EAST);
        p3.add(new Button("West-2"),BorderLayout.WEST);
        Panel p4 = new Panel();
        p4.setLayout(new GridLayout(2,2));
        p4.add(new Button("base-1"));
        p4.add(new Button("base-2"));
        p4.add(new Button("base-3"));
        p4.add(new Button("base-4"));
        p3.add(p4,BorderLayout.CENTER);
        frame.add(p1);
        frame.add(p3);
        frame.setSize(400,300);
        frame.setLocation(300,300);
        frame.setBackground(Color.blue);
        frame.setVisible(true);
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

总结：

1. frame是一个顶级窗口！
2. Panel是无法单独显示，必须放在一个容器中。
3. 布局管理器：流式   东西南北中  表格
4. 大小、定位、可见性、背景颜色、监听

4.监听事件

事件监听：当某个事件发生的时候做什么。

public class TestActionEven {
    //按下按键触发一些事件
    public static void main(String[] args) {
        Frame frame = new Frame();
        Button button = new Button();
        MyAction myAction = new MyAction();
        //因为addActionListener()需要一个ActionListener的参数，所以我们构建一个ActionListener的实现
        button.addActionListener(myAction);
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
        WindowClosing(frame);
    }
    //关闭窗口事件
    public static void WindowClosing(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}
//事件监听
class MyAction implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("aaa");
    }
}

多个按钮共享一个事件

public class TestActionTwo {
    public static void main(String[] args) {
        Frame frame = new Frame("开始-停止");
        Button button1 = new Button("start");
        Button button2 = new Button("stop");
        MyMonitor myMonitor = new MyMonitor();
        button2.setActionCommand("button2:stop");
        button1.addActionListener(myMonitor);
        button2.addActionListener(myMonitor);
        frame.add(button1,BorderLayout.NORTH);
        frame.add(button2,BorderLayout.SOUTH);
        frame.pack();
        frame.setVisible(true);
        WindowClosing(frame);
    }
    //关闭窗口事件
    public static void WindowClosing(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) {
        //e.getActionCommand(); 获取信息
        System.out.println("按钮被点击了：msg=>" + e.getActionCommand());
    }
}

5.输入框TextFiled

如何获取输入框内容通过监听器

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('*');
        pack();
        setVisible(true);
    }
}
class MyActionListener implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
        TextField textField = (TextField) e.getSource();//获得一些资源，返回一个对象
        System.out.println(textField.getText());//获得输入框的文本
        textField.setText("");//清空命令行
    }
}