Please help to make a java code in a simple way so it easier to understand how i

Question

Please help to make a java code in a simple way so it easier to understand how it works:

Empirical shuffle check. Run computational experiments to check that our shuffling code works as advertised. Write a program ShuffleTest that takes command-line arguments M and N, does N shuffles of an array of size M that is initialized with a[i] = i before each shuffle, and prints an M-by-M table such that row i gives the number of times i wound up in position j for all j. All the entries in the array should be close to N/M.

Explanation / Answer

public class Practise_01_01_36 {

public static class RandomArray {
private int M = 0;
private int[] a = null;

public int[] getA() {
return a;
}

public void setA(int[] a) {
this.a = a;
}

public RandomArray(int M) {
this.M = M;
this.a = new int[M];
for (int i = 0; i < M; i++) {
a[i] = i;
}
}
}

public static void shuffle(int[] a) {
int N = a.length;
for (int i = 0; i < N; i++) {
int r = i + StdRandom.uniform(N-i); // between 0 and N-1
int temp = a[i];
a[i] = a[r];
a[r] = temp;
}
}

public static class RandomChecker {
private double[][] matrix = null;
public double[][] getMatrix() {
return matrix;
}

private int M = 0;
private int N = 0;

public RandomChecker(int M, int N) {
this.M = M;
this.N = N;
matrix = new double[M][];
for (int i = 0; i < matrix.length; i++) {
matrix[i] = new double[M];
}
}

public void execute() {
for (int n = 0; n < this.N; n++) {
RandomArray c = new RandomArray(M);
int[] a = c.getA();
StdRandom.shuffle(a);
for (int k = 0; k < a.length; k++) {
int i = a[k];
int j = k;
matrix[i][j] += 1;
}
}
}

public void print() {
for (int i = 0; i < M; i++) {
for (int j = 0; j < M; j++) {
StdOut.print(matrix[i][j] + " ");
}
StdOut.print(" ");
}
}
}

public static void main(String[] args) {
StdOut.println("Please input M: ");
int M = StdIn.readInt();
StdOut.println("Please input N: ");
int N = StdIn.readInt();
StdOut.println("Random Check: ");
RandomChecker rc = new RandomChecker(M, N);
rc.execute();
rc.print();
}
}

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