삼각형 , 역삼각형

public class Loop3{

	public static void main(String [] args){
    
    int n = 5;
    
    for(int i =0; i< n; i ++){ /*5번 반복*/
            for (int j = 0; j < n - i -1; j++){
                System.out.print(" ");
            }
            for (int j = 0; j < ( i+1) *2-1; j++){
                System.out.print("*");
            }
            System.out.println();
        }
        /*역삼각형*/
        System.out.println("==============");
        for (int i = 0; i<n; i ++){
            for(int j = 0; j < i; j++){
                System.out.print(" ");
            }
            for (int j = 0; j < ((n-i-1))*2+1; j++ ){
                System.out.print("*");
            }
            System.out.println();
        }   
    
    }

}

 

출력

    *
   ***
  *****
 *******
*********
==============
*********
 *******
  *****
   ***
    *