java array find index of element

## Finding the Index of an Element in a Java Array: A Comprehensive Tutorial

**1. The Basics: Iterating Through the Array**

The most fundamental way to find the index of an element is by iterating through the array and comparing each element with the target value.

**Concept:**

* Loop through each element of the array using a `for` loop.
* Inside the loop, compare the current element with the target value.
* If a match is found, return the current index.
* If the target value is not found after iterating through the entire array, return a specific value (e.g., -1) to indicate that the element is not present.

**Code Example:**

**Explanation:**

1. **`findIndexOf(int[] arr, int target)` method:** This method takes an integer array `arr` and the target value `target` as input.
4. **Comparison:** Inside the loop, `if (arr[i] == target)` compares the current element `arr[i]` with the `target` value.
5. **Return Index:** If a match is found, the method immediately returns the index `i`.
6. **Element Not Found:** If the loop completes without finding a match, the method returns -1, indicating that the target element is not present in the array.
7. **`main` method:** The `main` method demonstrates how to use the `findIndexOf` method with sample data. It calls the method, checks the returned index, and prints ...

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