How to Find the Index of an Element in a Java Array?

Java's Array indexOf()

The Java Array class doesn't have an indexOf() method. However, the Arrays utility class provides a convenient way to search for elements within an array.

IndexOf for Unsorted Non-Primitive Arrays

To find the index of an object within an unsorted array that consists of non-primitive elements, use:

java.util.Arrays.asList(theArray).indexOf(o)

IndexOf for Sorted Arrays

If the array is sorted, utilize binary search for improved performance:

java.util.Arrays.binarySearch(theArray, o)

IndexOf for Unsorted Primitive Arrays

For unsorted primitive arrays, consider alternative solutions:

• Using a loop to iterate through the array (e.g., for loops, while loops)
• Implementing a binary search algorithm (since binary search is not available for primitive arrays by default)

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