Drawing shapes in Java Using for loop. 

Upside Down Triangle

int n = 5;

for (int i = 1; i <= n; i++){
   for (int j = 1; j <= n; j++){
       System.out.print(" ");
   }
   for (int j = i; j <= n; j++){
       System.out.print("@ ");
   }
    System.out.println();
}

Right side Right Angle triangle

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("@ ");
   }
    System.out.println();
}

Cute peak trianlge

int n = 5;

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("@ ");
   }
    System.out.println();
}

Peak Triangle

int n = 5;

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("@ ");
   }
    System.out.println();
}