public class ArrayTools {

    // Returns an array of n random integers.  The integers are
    // chosen from the interval [0..range)
    public static int[] randomArray (int size, int range) {
        int[] a = new int[size];
        java.util.Random r = new java.util.Random();
        for (int i = 0; i < a.length; i++) {
            a[i] = r.nextInt(range);
        }
        return a;
    }

    public static void printArray(int[] a, String msg) {
        System.out.println(msg);
        for (int i = 0; i < a.length; i++) {
            System.out.print(a[i] + " ");
        }
        System.out.println();
    }

    public static void printArray(char[] a, String msg) {
        System.out.println(msg);
        for (int i = 0; i < a.length; i++) {
            System.out.print(a[i] + " ");
        }
        System.out.println();
    }

    public static void printArray(String[] a, String msg) {
        System.out.println(msg);
        for (int i = 0; i < a.length; i++) {
            System.out.print(a[i] + " ");
        }
        System.out.println();
    }



    // Later we will improve this after we talk about the Object class,
    // but for now this should be good enough.
    public static void printStudentArray(Student[] a, String msg) {
        System.out.println(msg);
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i].toString());
        }
        System.out.println();
    }



    // Precondition: a1.length == a2.length
    public static void printParallelArrays(String[] a1, int[] a2, String msg) {
        System.out.println(msg);
        for (int i = 0; i < a1.length; i++) {
            System.out.println("   " + a1[i] + " " + a2[i]);
        }
        System.out.println();
    }

}