Find the largest of a sub-array for a specific window size

LargestInSubArrayInAWindow.groovy

int[] arr = [-1, 3, 1, 5,3 ,2 ,1, 0, 7];
int window = 3
int len = arr.length;

for(int i = 0; i< len-window+1; i += 1) {
    int[] newarr = new int[window];
    for(int j =0 ; j< window; j++){
        newarr[j] = arr[i+j];
    }
    println(getMax(newarr))
}

String getMax(int[] newarr) {
    int largest = 0;
    String str =  "";
    for(int i =0;i<newarr.length;i++) {
	str += newarr[i] + " ";
	if(newarr[i] > largest) {
	largest = newarr[i];
	}
    }
    return str + " => " + largest;
}

/*
-1 3 1  => 3
3 1 5  => 5
1 5 3  => 5
5 3 2  => 5
3 2 1  => 3
2 1 0  => 2
1 0 7  => 7
*/