Diamond Pattern in java.

Diamond.java

package com.demo.advjava;

public class StarsPattern {
	public static void main(String[] args) {
		printStars90(10);
		printStarsRev(10);
		// printStarsRev(10);
		printStars(10);
	}

	static void printStars(int n) {
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				if (j < i)
					System.out.print("*");
				else
					System.out.print(" ");
			}
			for (int j = n - 1; j >= 0; j--) {
				if (i >= j)
					System.out.print("*");
				else
					System.out.print(" ");
			}
			System.out.println();
		}
	}

	static void printStars90(int n) {
		for (int i = n - 1; i >= 0; i--) {
			for (int j = 0; j < n; j++) {
				if (i <= j)
					System.out.print("*");
				else
					System.out.print(" ");
			}

			for (int j = n - 1; j >= 0; j--) {
				if (i >= j) {
					System.out.print(" ");
				} else {
					System.out.print("*");
				}
			}
			System.out.println();
		}
	}

	static void printStarsRev(int n) {
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				if (j < i)
					System.out.print(" ");
				else
					System.out.print("*");
			}
			for (int j = n - 1; j >= 0; j--) {
				if (j > i)
					System.out.print("*");
				else
					System.out.print(" ");
			}
			System.out.println();
		}
	}
}