How to find the location of the element of an array?

Your code is quite weak:

- class names start with capital letter. Always!
- each code line has to end with a ";"
- init and assign variables as you need them - in the loop-header, when asking for a value. That limits the scope (not here in the example, but in general)
- the for-loop:
- all being beside of humans do count from 0. Do so too please.
- a loop with 5 elements is counted therefore from 0-4 (end condition "<5" is preferable over "<=4").

public class Location_of_an_element_in_array {

	public static void main(String[] args) {
		int arr[] = new int[5];
		
		// fill Array
		Scanner input = new Scanner(System.in);
		for (int i = 0; i < 5; i++) {
			System.out.println("Enter number:");
			arr[i] = input.nextInt();
		}

		// search
		System.out.println("\nWhich number's location you want to search?");
		int search = input.nextInt();

		//TODO: add loop with search here!
		
	}
}

Now the code runs.
Please use Eclipse or Netbeans for coding - both IDE will guide you through the process! There is no reason not to use one of them.

This is a homework task. You will have to add the search yourself. Please ask when you get stuck in that, also debugging the code can help you a lot (google for that according to the IDE you're using).

Have fun!