Simple Java Graphic Program Not Displaying -

basically i'm starting learn graphics in java made simple program display 2 rectangles , string on screen. program compiles fine not display 2 rectangles or string. input on problem appreciated.

//classone.java import javax.swing.*;  public class classone {     public static void main(string[] args)     {         jframe f = new jframe("title");         f.setdefaultcloseoperation(jframe.exit_on_close);         classtwo object = new classtwo();          f.add(object); //add object frame         f.setsize(400,250);         f.setvisible(true);      } }   //classtwo.java import java.awt.*; import java.awt.event.*; import javax.swing.*;  public class classtwo extends jpanel {      public void paintcomponet(graphics g) //takes object graphics class     {         super.paintcomponent(g);         this.setbackground(color.black);          g.setcolor(color.white);         g.fillrect(25, 25, 100, 30); //x,y,width, height          g.setcolor(new color(190,81,215));         g.fillrect(25, 70, 100, 30);          g.setcolor(color.red);         g.drawstring("text", 25, 120);         system.out.print("hi");     }  } 

it's

public void paintcomponent(graphics g) 

not

public void paintcomponet(graphics g) { 

add @override annotation allow compiler check method