Check greatest number in Array Java

package aRray;

import java.util.*;

public class practicalArray {

// check gratest number

public static int greatestNumber(int size, int []arr, int max) {

for(int i = 0 ; i < size; i++) {

if(arr[i] > max) {

max = arr[i];

}

}

return max;

}

public static void main(String [] args) {

Scanner scan = new Scanner(System.in);

int size = scan.nextInt();

int arr [] = new int[size];

int max = 0;

for(int i = 0 ; i < size; i++) {

arr[i] = scan.nextInt();

}

int result = greatestNumber(size, arr, max );

System.out.println(result);

}

}