Home/ Questions/Learn how to fix error: Index 0 out of bounds for length 0.
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Lucas Jourdan
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Asked: 2022-05-18T11:01:54+00:00 In:

Learn how to fix error: Index 0 out of bounds for length 0.

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I am trying to write a java that returns an invalid answer. I don’t know where the incorrect command is in the “index 0 out of bounds for length 0.” My detail is:

public static void main(String[] args) {
  Scanner keyboard = new Scanner(System.in);
  String input = keyboard.nextLine();
  System.out.println(input);
  while(true){
  if(args[0].equals("k")){
  System.out.println("k");
  }
  }
 }

and I end up with the warning message:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0

Please, suggest the best answer to fix it.

index 0 out of bounds for length 0
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2 Answers

  1. Best Answer
    Expert

    The cause: This java class is being run without any arguments. In such situation, args[0] is now present, and the Exception with Error message is now given.

    Solution: To get rid of the error: Index 0 out of bounds for length 0, you can change the if form like this:

    if(args[0].equals("k") && args.length > 0 )

    When your program produces error-free output, the limitless look of printing k is achieved by running the program using the input “k”.  You can do this by using the java File k command, or by starting it from the IDE with this argument.

    • 25

  2. Run the code on cmd and run MyProgram abc Java xyz. Then args will contain “abc”, xyz”.

    • 16

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