Can anyone help me to solve this error?

Question

1.00/5 (1 vote)

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Java

import java.math.*;

public class Encryption
{
   public static void main(String[] args)
   {
       //declaring BigInteger variables for message,e and n
       BigInteger message,e,n,cipher;
      
       //creating BigInteger objects for message , e and n
       message=new BigInteger(args[0]);
       e=new BigInteger(args[1]);
       n=new BigInteger(args[2]);
      
       //finding the cipher text value using modPow method
       cipher=message.modPow(e,n);
      
       //printing the cipher text
       System.out.println("Message: "+args[0]);
       System.out.println("e      : "+args[1]);
       System.out.println("n      : "+args[2]);
       System.out.println("\nAfter Encryption, Cipher Text: "+cipher);
   }
}

I'm having error at line 14 for message=new BigInteger(args[0]);

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 at learnprogramming.Encryption.main(Encryption.java:14)

What I have tried:

I tried using following code after void main

Java

if (args.length != 3)
        {
            System.out.println("java Encrypt message e n");
            System.exit(0);
        }

but this doesn't give me the required encrypted output numbers. It just prints:

java Encrypt message e n

Can anyone please help me solve this error?

Posted 4-Apr-19 5:52am

khajak80

Updated 4-Apr-19 11:12am

Nelek

v2

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OriginalGriff · Accepted Answer · 2019-04-04T06:08:00

Solution 1

Simpel: you haven't specified any parameters, so there are no arguments to process.
No arguments == empty array == error when you try to use any element at all.

Add a check for "no parameters", and when that works, add parameters to your run.

Posted 4-Apr-19 6:08am

OriginalGriff

Comments

khajak80 4-Apr-19 16:37pm

Thank you for your prompt answer!

Patrice T · Accepted Answer · 2019-04-04T07:17:00

Quote:
error at line 14 for message=new BigInteger(args[0]);
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 at learnprogramming.Encryption.main(Encryption.java:14)

The error message tells you that your code was called with no parameter when it needs 3 parameters.
The only solution is to call this code with required parameters.

Quote:
but this doesn't give me the required encrypted output numbers. It just prints:
java Encrypt message e n

This code is doing exactly what it is supposed to do, but it can't create missing values.

It is like trying to use a car without the keys, if you are not a thief, it can get complicated.
It is like trying to solve c = a + b without knowing a and b.

The only possible solution is to call this code with 3 parameters.