java - Radio Button Project with null point errors -
how fix it? -------------------configuration: questions - jdk version 1.8.0_25 - -------------------- exception in thread "main" java.lang.nullpointerexception @ question3.(question3.java:103) @ question2.(question2.java:51) @ questions.main(questions.java:17) //////////////\ output of whole program hey need project, don't know how fix it. i'm new @ this, in advance helping. this first class, named questions /** * @(#)questions.java * * questions application * * @author * @version 1.00 2015/5/22 */ import java.awt.*; import java.awt.event.*; import javax.swing.*; public class questions { public static void main(string[] args) { question2 frame = new question2(); frame.setsize(800,600); frame.setvisible(true); } } this 2nd class, name question2 /** * @(#)question2.java * * * @author * @version 1.00 2015/5/22 */ import java.awt.*; import java.awt.event.*; imp...