import java.awt.*;
import javax.swing.*;

public class Test extends JApplet
{
  JTextField xfield1 ;
  JLabel xLabel1 ;
  Container con;
  public void init()
  {
    con=getContentPane();
    con.setLayout(new FlowLayout());
    xfield1 = new JTextField(12);
    xLabel1 = new JLabel("请输入X1坐标");
    con.add(xLabel1);
   con.add(xfield1);
   
  }
  public void paintComponent(Graphics g)  // not paintComponet -- why
  {  
    super.paintComponent(g);  // not paintComponents, 
          // and I don't think JApplet has paintComponent(Graphics) -- why
    g.drawLine(20,20,50,100);

  }
}