package exceise;

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.WindowConstants;

public class BorderLayoutPosition extends JFrame{

String[] border= {BorderLayout.CENTER,

BorderLayout.NORTH,

BorderLayout.SOUTH,BorderLayout.WEST,

BorderLayout.WEST,BorderLayout.EAST};

String[] buttonName= {"center button","north button","south button","west button"

,"east button"};

public BorderLayoutPosition() {

setTitle("使用边界管理器");

Container c=getContentPane();//设置一个容器

setLayout(new BorderLayout());

for(int i=0;i<border.length;i++) {

c.add(border[i],new JButton(buttonName[i]));

}

setSize(350,200);

setVisible(true);

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

}

public static void main(String[] args) {

new BorderLayoutPosition();

}

}

加粗下划线的地方报错，main函数无法识别