Question

I have written this code in Java on my 64 bit Linux system:

    class WrapperClass1
    {
       public static void main(String s [])
       {
            int noinput=s.length;
            System.out.println("Number of values entered is :- " + noinput);
            System.out.println( s[0] + "," + s[1] );
            int x = Integer.parseInt(s[0]);
            int y = Integer.parseInt(s[1]);
            int z = x + y;
            System.out.println(" Sum = " + z);
       }
    };

Now, when I try to compile it, it successfully compiles, but when I execute the program it shows me an exception called:

           Number of values entered is :- 0
           Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
           at WrapperClass1.main(WrapperClass1.java:7)

Answer 1

Input : String[]

to which method ? –> main(String[] args)

when to give ? –> While we say java <className> <input1> <input2> ... to execute

when it throws ArrayIndexOutOfBoundsException ? –>

Initial : String s[]

But before you initialise the variable(array), trying to access the index which is not available…

Solution : provide the inputs through the command(as these are command line args)

How to avoid error even if input is not given ? –> check the size of array,

Hope this helps