X pattern.java

public class Main
{
	public static void main(String[] args) {
		int n=5;
		for(int i=1;i<n;i++){
		    for(int j=1;j<=i;j++){
		        System.out.print("* ");
		    }
		    for(int j=i;j<n;j++){
		        System.out.print("  ");
		    }
		    for(int j=i;j<n;j++){
		        System.out.print("  ");
		        
		    }
		    for(int j=1;j<=i;j++){
		        System.out.print("* ");
		    }
		    System.out.println();
		}
		for(int i=1;i<=n;i++){
		    for(int j=i;j<=n;j++){
		        System.out.print("* ");
		    }
		    for(int j=1;j<i;j++){
		        System.out.print("  ");
		    }
		    for(int j=1;j<i;j++){
		        System.out.print("  ");
		    }
		    for(int j=i;j<=n;j++){
		        System.out.print("* ");
		    }
		    System.out.println();
		}
	}
}

OUTPUT
*                 * 
* *             * * 
* * *         * * * 
* * * *     * * * * 
* * * * * * * * * * 
* * * *     * * * * 
* * *         * * * 
* *             * * 
*                 *