learning java AWT 布局管理器BorderLayout

public class BorderLayoutTest {
    public static void main(String[] args) {
        var f = new Frame("BorderLayout");
        f.setLayout(new BorderLayout());
        f.add(new Button("south"), BorderLayout.SOUTH);
        f.add(new Button("north"), BorderLayout.NORTH);
        f.add(new Button("center"));
        f.add(new Button("west"),BorderLayout.WEST);
        f.add(new Button("east"),BorderLayout.EAST);

        f.pack();
        f.setVisible(true);


    }
}