一个简单的按钮布局界面，想简化代码，但为什么都不显示啊

Java code

import javax.swing.*; import java.awt.*;  public class Dog   {    public static void main(String [] args){        JFrame frame = new JFrame();        frame.setSize(new Dimension(100,100));        frame.setLocation(10,10);        frame.setVisible(true);        frame.setLayout(new BorderLayout());        String[] s ={"BorderLayout.NORTH","BorderLayout.WEST","BorderLayout.CENTER","BorderLayout.EAST","BorderLayout.SOUTH"};                for(int i = 1; i <= 5; i++){            frame.add(new JButton("button"+ i),s[i-1]);                    }            }            }

Java code

    public static void main(String[] args)    {        JFrame frame = new JFrame();        frame.setSize(new Dimension(100,100));        frame.setLocation(10,10);        frame.setVisible(true);        frame.setLayout(new BorderLayout());        String[] s ={BorderLayout.NORTH,BorderLayout.WEST,BorderLayout.CENTER,BorderLayout.EAST,BorderLayout.SOUTH};                for(int i = 1; i <= 5; i++){            frame.add(new JButton("button"+ i),s[i-1]);                    }            }
[解决办法]
frame.setVisible(true);
放在最后试下
Java code
import javax.swing.*; import java.awt.*;  public class Dog   {    public static void main(String [] args){        JFrame frame = new JFrame();        frame.setSize(new Dimension(100,100));        frame.setLocation(10,10);        frame.setLayout(new BorderLayout());        String[] s ={"BorderLayout.NORTH","BorderLayout.WEST","BorderLayout.CENTER","BorderLayout.EAST","BorderLayout.SOUTH"};                for(int i = 1; i <= 5; i++){            frame.add(new JButton("button"+ i),s[i-1]);                    }          frame.setVisible(true);            }            }
[解决办法]
Java code
import javax.swing.*; import java.awt.*;  public class Dog   {    public static void main(String [] args){        JFrame frame = new JFrame();        frame.setSize(new Dimension(100,100));        frame.setLocation(10,10);        frame.setLayout(new BorderLayout());        String[] s ={BorderLayout.NORTH,BorderLayout.WEST,BorderLayout.CENTER,BorderLayout.EAST,BorderLayout.SOUTH};        for(int i = 1; i <= 5; i++){            frame.add(new JButton("button"+ i),s[i-1]);                    }                frame.setVisible(true);    }}
[解决办法]
刚刚发现上面的Border的常量用的不对，应该写成这样
Java code
import javax.swing.*;import java.awt.*;public class Dog{    public static void main(String [] args){        JFrame frame = new JFrame();        frame.setSize(new Dimension(100,100));        frame.setLocation(10,10);        frame.setLayout(new BorderLayout());        String[] s ={BorderLayout.NORTH,BorderLayout.WEST,BorderLayout.CENTER,BorderLayout.EAST,BorderLayout.SOUTH};        for(int i = 1; i <= 5; i++){            frame.add(new JButton("button"+ i),s[i-1]);        }        frame.setVisible(true);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }}
[解决办法]
 正解。
探讨

Java code


    public static void main(String[] args)
    {
        JFrame frame = new JFrame(); 
 
        frame.setSize(new Dimension(100,100));
        frame.setLocation(10,10);
        frame……

[解决办法]
BorderLayout.NORTH,
BorderLayout.WEST,
BorderLayout.CENTER,
BorderLayout.EAST,
BorderLayout.SOUTH
这些都是字符串常量，
加了引号反而把意思改了，
这个是主要原因。
[解决办法]
Java code
import javax.swing.*; import java.awt.*;  public class Test {    public static void main(String [] args){        JFrame frame = new JFrame();        frame.setSize(new Dimension(400,500));        frame.setLocation(10,10);               frame.setLayout(new BorderLayout());       // String[] s ={"BorderLayout.NORTH","BorderLayout.WEST","BorderLayout.CENTER","BorderLayout.EAST","BorderLayout.SOUTH"};               // for(int i = 1; i <= 5; i++){            //BorderLayout.NORTH 并不等于字符串"BorderLayout.NORTH"            frame.add(new JButton("button1"),BorderLayout.NORTH);              frame.add(new JButton("button2"),BorderLayout.WEST);              frame.add(new JButton("button3"),BorderLayout.CENTER);              frame.add(new JButton("button4"),BorderLayout.EAST);              frame.add(new JButton("button5"),BorderLayout.SOUTH);         //}        //Frame要加添加完控件以后，在设置为显示状态        frame.setVisible(true);    }}