这里介绍3种布局：

1. FlowLayout 流式布局
2. BorderLayout 边界布局
3. GridLayout 网格布局

FlowLayout

/*MyFrame定义见 Java笔记9，这里添加了事件监听方法*/
public class TestFlowLayout {
    public static void main(String[] args) {
        MyFrame myFrame = new MyFrame(300, 300, 500, 500, Color.GRAY);
        //组件--按钮
        Button button1 = new Button("Button1");
        Button button2 = new Button("Button2");
        Button button3 = new Button("Button3");
        myFrame.setLayout(new FlowLayout(FlowLayout.TRAILING));//添加默认的流式布局的中间位置
        myFrame.add(button1);
        myFrame.add(button2);
        myFrame.add(button3);
    }
}

BorderLayout

public class TestBorderLayout {
    public static void main(String[] args) {
        MyFrame myFrame = new MyFrame(300, 300, 400, 300, Color.GRAY);
        myFrame.setLayout(new BorderLayout());//设置BorderLayout
        //设置五个按钮
        Button button1 = new Button("Center button");
        Button button2 = new Button("North button");
        Button button3 = new Button("South button");
        Button button4 = new Button("West button");
        Button button5 = new Button("East button");

        //将按钮添加到Frame中时，指定在组件中的位置
        myFrame.add(button1, BorderLayout.CENTER);
        myFrame.add(button2, BorderLayout.NORTH);
        myFrame.add(button3, BorderLayout.SOUTH);
        myFrame.add(button4, BorderLayout.WEST);
        myFrame.add(button5, BorderLayout.EAST);
    }
}

GridLayout网格布局

public class TestGridLayout {
    public static void main(String[] args) {
        MyFrame myFrame = new MyFrame(300, 300, 400, 300, Color.GRAY);
        myFrame.setLayout(new GridLayout(2, 3, 20, 10));

        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");

        myFrame.add(button1);
        myFrame.add(button2);
        myFrame.add(button3);
        myFrame.add(button4);
        myFrame.add(button5);
        myFrame.add(button6);
        //myFrame.pack();//自动优化布局,会把布局缩小到尽量小
    }
}