nest 'for' loop.

 /*
 nest for loop demo.
 Note that,'upside' triangle controls 'inner condition'.
 */
 import kju.print.Print;
 public class Pyramid {
     public static void main(String[] args) {
         upsideNumbers(5);
         Print.println("------------------");
         multiplicationTable(3);
         Print.println("------------------");
         pyramid(5);
     }
     /*shape begins:
     ----*
     ---* *
     --* * *
     -* * * *
     shape ends:*/
     static void pyramid(int height){
         for(int i = 0; i < height; i++) {    //all rows.
             for(int j = i; j < height - 1; j++)    //vitual for '-'.
                 Print.print(" ");
             for(int j = 0; j <= i; j++)
                 Print.print("* ");
             Print.println();
         }    //for(i)
     }

     /*shape begins:
     1
     12
     123
     1234
     12345
     shape ends:*/
     static void upsideNumbers(int height) {
         for (int i = 1; i <= height; i++) {
             for (int j = 1; j <= i ; j++)
                 Print.print(j);
             Print.println();
         }//for(i).
     }

     /*shape begins:
     1*1=1
     1*2=2 2*2=4
     1*3=3 2*3=6 3*3=9
     shape ends:*/
     static void multiplicationTable(int height){
         for (int i = 1; i <= height; i++) {
             for (int j = 1; j <= i; j++)
                 Print.print(j + "*" + i + "=" + (j * i) + "\t");
             Print.println();
         }//for(i)
     }
 }