Question

import java.util.Random;
import java.util.ArrayList;
/**
 *
 */
public class hw5_task8 {

    public static void main(String[] args) {
        int[] grades = randomIntArr(10);
        printIntArray("grades", grades);
        ArrayList<Integer> indexesF_AL = selectIndexes_1(grades);
        System.out.println(" indexesF_AL:    " + indexesF_AL);
        int[] indexesF_Arr = selectIndexes_2(grades);
        printIntArray("indexesF_Arr",indexesF_Arr);
    }
    
 
    public static int[] randomIntArr(int N){
        int[] res = new int[N];
        Random r = new Random(0);
        for(int i = 0; i < res.length; i++){
            res[i] = r.nextInt(101); // r.nextInt(101) returns an in in range [0, 100]
        }
        return res;
    }
    
    public static void printIntArray(String name, int[] a) {
        System.out.printf("%12s: ", name);
        if (a == null) {
            System.out.printf("Null array!\n\n");
            return;
        }

        for (int i = 0; i < a.length; i++) {
            System.out.printf("%5d", a[i]);
        }
        System.out.printf("\n");
    }
    
}

File hw5_task8.java contains an incomplete program. Complete that program by defining the following two functions that return the indexes of the grades that are strictly smaller than 60:

selectIndexes_1 function, that returns the indexes as an arrayList of integers.

selectIndexes_1 function, that returns the indexes as an array of integers.

Sample output:

      grades:    67   72   93    5    9   54   82   42   84   98
 indexesF_AL:    [3, 4, 5, 7]
indexesF_Arr:     3    4    5    7