java中为什么控件不显示出来

代码如下

import java.awt.Container;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.net.URL;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class Snake extends JFrame{
    private JPanel jp;
    private Icon icon;
    private JLabel[] num;
    private URL url1;
    private URL url2;
    /**
     * 
     */
    private static final long serialVersionUID = -7453810388329378685L;
    public static void main(String[] args){
        new Snake();
        }
    public Snake(){
        url1=Snake.class.getResource("hollowsquare.png");
        url2=Snake.class.getResource("solidsquare.png");
        Container c=getContentPane();
        num=new JLabel[10000];
        setResizable(false);   //不允许更改大小
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 500, 500);
        setVisible(true);
        setLayout(new GridLayout(100,100,0,0));
        for(int i=0;i<10000;i++){
            icon=new ImageIcon(url2);
            System.out.println("running"+i);
            num[i].setSize(5, 5);
            num[i].setIcon(icon);
            num[i].setVisible(true);
            c.add(num[i]);
        }

    }
}

回去后帮你运行一下程序看看。。。。