Java Program for Linear Search

Problem: Given an array arr[] of n elements, write a function to search a given element x in arr[].

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// Java code for linearly search x in arr[]. If x
// is present then return its location, otherwise
// return -1
class LinearSearch {
    // This function returns index of element x in arr[]
    static int search(int arr[], int n, int x)
    {
        for (int i = 0; i < n; i++) {
            // Return the index of the element if the element
            // is found
            if (arr[i] == x)
                return i;
        }
  
        // return -1 if the element is not found
        return -1;
    }
  
    public static void main(String[] args)
    {
        int[] arr = { 3, 4, 1, 7, 5 };
        int n = arr.length;
          
        int x = 4;
  
        int index = search(arr, n, x);
        if (index == -1)
            System.out.println("Element is not present in the array");
        else
            System.out.println("Element found at position " + index);
    }
}

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Output:

Element found at position 1

The time complexity of the above algorithm is O(n).

Please refer complete article on Linear Search for more details!

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