网络布局管理器

public class GridLayoutPsoition extends JFrame{
    public GridLayoutPsoition() {
        // TODO Auto-generated constructor stub
    Container c = getContentPane();
    setLayout(new GridLayout(7,3,5,5));
    for(int i=0;i<20;i++){
        c.add(new JButton("jbutton"+i));
    }
    setSize(300,300);
    setTitle("这是一个使用网络布局管理器的窗体");
    setVisible(true);
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new GridLayoutPsoition();
    }

}