How to find the index of an element in an array in Java?

To find the index of an element in an array in Java, do this: java.util.Arrays.asList(array).indexOf(element).

Here's how you do it:

Integer[] integerArray = new Integer[] { 34, 3, 55, 11, 1 };
int indexOfFiftyFive = java.util.Arrays.asList(integerArray).indexOf(55);

System.out.println(indexOfFiftyFive); // 2

String[] stringArray = new String[] { "Hello", "World", "!" };
int indexOfWorld = java.util.Arrays.asList(stringArray).indexOf("World");

System.out.println(indexOfWorld); // 1