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thanks for the help. I already fix the problem.

@ daryl: its a radio button
@ norm here's the error when i change to getSelectedCheckbox() :

C:\Users\Faculty\cs257\src\testNi.java:60: cannot find symbol
symbol : method...

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


public class testNi extends Frame implements ActionListener {
public Label first,second,result;
public Button...