Java Utililty Methods Array Max Value

if (array == null || array.length == 0)
    throw new IllegalArgumentException("Array cannot be null!");
int maxI = 0;
for (int i = 1; i < endIndex; i++) {
    if (array[i] > array[maxI])
        maxI = i;
return maxI;
...

assert (vals.length > 0);
assert (vals[0] != 0);
int res = Integer.MIN_VALUE;
for (int i = 0; i < vals.length; i++) {
    assert (vals[i] != 0);
    int tmp = floorDiv(c, vals[i]);
    if (tmp > res)
        res = tmp;
...

double max = Double.NEGATIVE_INFINITY;
for (double d : arr) {
    if (d > max)
        max = d;
return max;

int out = in[0];
for (int i = 1; i < in.length; i++) {
    if (in[i] > in[out]) {
        out = i;
return out;

double max = list[0];
for (int i = 1; i < list.length; ++i)
    if (list[i] > max)
        max = list[i];
return max;

if (array.length <= 0)
    throw new IllegalArgumentException("The array is empty");
float max = array[0];
for (int i = 1; i < array.length; i++)
    if (array[i] > max)
        max = array[i];
return max;

double ret = values[0];
for (int i = 1; i < values.length; i++) {
    ret = Math.max(ret, values[i]);
return ret;

int maximum = array[0];
for (int i = 1; i != array.length; i++)
    if (maximum < array[i])
        maximum = array[i];
return maximum;

double max = -Double.MAX_VALUE;
for (double val : array) {
    max = max < val ? val : max;
return max;

int max = src[0];
for (int a : src) {
    if (a > max)
        max = a;
return max;