how to get the max value of an array java

1public static double arrayMax(double[] arr) {
2    double max = Double.NEGATIVE_INFINITY;
3
4    for(double cur: arr)
5        max = Math.max(max, cur);
6
7    return max;
8}

1import java.util.Random;
2
3public class Main {
4
5public static void main(String[] args) {
6   int a[] = new int [100];
7   Random rnd = new Random ();
8
9    for (int i = 0; i< a.length; i++) {
10        a[i] = rnd.nextInt(99-0)+0;
11        System.out.println(a[i]);
12    }
13
14    int max = 0;          
15
16    for (int i = 0; i < a.length; i++) {
17        a[i] = max;
18
19
20        for (int j = i+1; j<a.length; j++) {
21            if (a[j] > max) {
22               max = a[j];
23            }
24
25        }
26    }
27
28    System.out.println("Max element: " + max);
29}
30}