how to fix java lang IndexOutOfBoundsException

Question

Exception in thread  main  java lang IndexOutOfBoundsException  Index    0  Size  0 at java util ArrayList rangeCheck ArrayList java 604    in line of arraylist java  private void rangeCheck int index        if  index  gt   size          throw new IndexOutOfBoundsException outOfBoundsMsg index        in line   List lstpp   getResult pp        System out println       Persegi Panjang            System out println  luas       Integer lstpp get 0       Please help

User · Answer

You are trying to access the first element lstpp get 0  of an empty array  Just add an element to your array and check for  lstpp isEmpty   before accessing an element

User · Answer

You want to get an element from an empty array  That s why the Size  0 from the exception  java lang IndexOutOfBoundsException  Index  0  Size  0  So you cant do lstpp get 0  until you fill the array

User · Answer

This error happens because your list lstpp is empty  Nothing at index 0   So either there is a bug in your getResult   function  or the empty list is normal and you need to handle this case  By checking the size of the list before  or catching the exception

User · Answer

Use if index length    lt  0   for Integer  or  Use if index equals null  for String

User · Answer

You do not have any elements in the list so can t access the first element

User · Answer

lstpp is empty  You cant access the first element of an empty list   In general  you can check if size  gt  index   In your case  you need to check if lstpp is empty   you can use  lstpp isEmpty

User · Answer

for   int i 0   i lt  list size     i             By executing this for loop   the loop will execute with a thrown exception as IndexOutOfBoundException cause  suppose list size is 10   so when index i will get to 10 i e when i 10 the exception will be thrown cause index size  i e  i size and as known that Java considers index starting from 0 1 2   etc the expression which Java agrees upon is index  lt  size  So the solution for such exception is to make the statement in loop as i lt list size    for   int i 0   i lt list size     i

[java] how to fix java.lang.IndexOutOfBoundsException

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