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Thread: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

  1. #1
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    Smile Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

    No matter whatever other code i write on my mac apart from the very popular Hello World, no other one seems to work on my mac.
     
    public class Distance1 {
     
    	public static void main(String[] args){
    		int a = Integer.parseInt( args[0] );
    		int b = Integer.parseInt( args[1] );
     
    		int dist = Math.max(a,b) - Math.min(a,b);
    		System.out.println( dist );
     
    	}
     
    }

    The error i get is: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
    at Distance1.main(distance1.java:4)

    Since i'm just a beginner, i dont know what it means. Can any1 help me with it?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

    DOes the args array contain any elements? Use the .length attrubute to test if there are enough elements in the array before trying to access any of its elements.

    If the array is empty there is no first element (index=0) and you'll get: ArrayIndexOutOfBoundsException: 0

    The args array is filled with what is on the command line when the java command starts the class. For example:
    java TheClass thisIsArg1 thisIsArg2

    when the main() method executes, args[0] would have the value: "thisIsArg1", and args[1] would be "thisIsArg2"
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

    i think you are not provide the command line arguments. Run the program with command line arguments like

    > java Distance1 4 5

  4. The Following User Says Thank You to basha2013 For This Useful Post:

    hemla (January 23rd, 2013)

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    Default Re: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

    Thanks to all of you who answered but now I get a different error:

    Distance1.java:7: cannot find symbol
    symbol : variable max
    location: class java.lang.Math
    System.out.println(Math.max - Math.min);
    ^
    Distance1.java:7: cannot find symbol
    symbol : variable min
    location: class java.lang.Math
    System.out.println(Math.max - Math.min);
    ^
    2 errors
    And now i'm confused :S

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    Super Moderator Norm's Avatar
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    Default Re: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

    Where did you see that the max and min variables are defined in the Math class?
    The compiler can not find their definitions in the Math class.

    Read the API doc for the Math class to see what variables and methods are in the class and how to use them.

    See post#1 for some usages of Math methods.
    If you don't understand my answer, don't ignore it, ask a question.

  7. The Following User Says Thank You to Norm For This Useful Post:

    hemla (January 23rd, 2013)

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    Default Re: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException problem on mac

    Problem solved!

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