//guI; graphics user interface
import javax.swing.*;
import 
java.awt.*;
 public class Main {  
	public static void main(String[] args) {  
        JFrame f = new 
JFrame();  
        f.setTitle("main");
        //f.setSize(300,400);
  
      f.setBounds(20,30,300,400);
        f.setVisible(true);
        
Container c=f.getContentPane();
        c.setLayout(new FlowLayout());
    
    JLabel lab=new JLabel();
        lab.setSize(20,300);
        
lab.setText("第一个:");
lab.setBackground(new Color(200,0,0));
        
lab.setFont(new Font("黑体",Font.BOLD,35));
        
//lab.setVisible(false);
        c.add(lab);
    } 
 
 }
原文地址:http://www.cnblogs.com/lpjia/p/3699607.html