Diamond inside Rectangle/square

Write a java program to print following pattern:

import java.util.Scanner;

public class DiamondInsideSqure {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter Row size :");

int n = sc.nextInt();

int states = n, space = 0;

for (int i = 0; i < 2 * n-1; i++) {

if(i==0) {

states=states;

space=space;

}

else if (i <n) {

states = states - 1;

space = space + 2;

}

else {

states = states + 1;

space = space - 2;

}

for (int j = 0; j < states; j++) {

System.out.print("*");

}

for (int k = 0; k < space; k++) {

System.out.print(" ");

}

for (int j = 0; j < states; j++) {

System.out.print("*");

}

System.out.println();

}

}

}