check if array is empty in java

  boolean isArrayEmpty = arr == null || arr.length == 0;

This code checks if an array (arr) is empty. First, it checks if the array itself is null. If it is, that would mean the array is indeed empty. Otherwise, it will check if the length of the array equals 0. If the length is equal to 0, the array will still be considered empty. If the array has a length that is higher than 0, the array is not considered empty. Finally, the boolean value isArrayEmpty will be set according to the result of the checks, true for empty and false for not empty.