Error: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
This error message means that your code try to access an array element that do not exist.
Java is zero based, this means that an array of size 3 have elements number 0, 1 and 2.
at Abc.answer(Abc.java:14)
Here you are given the position of error.
Unfortunately, this code is not complete and line 14 do not use array.
By using the debugger, you will be able to inspect variables at point of error and see exactly what os the problem.
There is a tool that allow you to see what your code is doing, its name is
debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is
debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia[
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http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[
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https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[
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The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.