Java/src/main/java/com/examplehub/basics/ForNestedLoop.java at master · JavaCimcoz/Java · GitHub

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package com.examplehub.basics;

public class ForNestedLoop {
  public static void main(String[] args) {

    /*
     * ####
     * ####
     * ####
     */
    for (int i = 1; i <= 3; i++) {
      for (int j = 1; j <= 4; j++) {
        System.out.print("#");
      }
      System.out.println("\n");
    }

    /*
     * Outer loop iteration 1
     * i = 1; j = 1
     * i = 1; j = 2
     * i = 1; j = 3
     * i = 1; j = 4
     * Outer loop iteration 2
     * i = 2; j = 1
     * i = 2; j = 2
     * i = 2; j = 3
     * i = 2; j = 4
     * Outer loop iteration 3
     * i = 3; j = 1
     * i = 3; j = 2
     * i = 3; j = 3
     * i = 3; j = 4
     */
    for (int i = 1; i <= 3; ++i) {

      System.out.println("Outer loop iteration " + i);

      for (int j = 1; j <= 4; ++j) {
        System.out.println("i = " + i + "; j = " + j);
      }
    }

    /*
     * 1
     * 12
     * 123
     * 1234
     * 12345
     */
    for (int i = 1; i <= 5; ++i) {
      for (int j = 1; j <= i; j++) {
        System.out.print("" + j);
      }
      System.out.println();
    }

    /*
     * 1*1=1
     * 1*2=2	2*2=4
     * 1*3=3	2*3=6	3*3=9
     * 1*4=4	2*4=8	3*4=12	4*4=16
     * 1*5=5	2*5=10	3*5=15	4*5=20	5*5=25
     * 1*6=6	2*6=12	3*6=18	4*6=24	5*6=30	6*6=36
     * 1*7=7	2*7=14	3*7=21	4*7=28	5*7=35	6*7=42	7*7=49
     * 1*8=8	2*8=16	3*8=24	4*8=32	5*8=40	6*8=48	7*8=56	8*8=64
     * 1*9=9	2*9=18	3*9=27	4*9=36	5*9=45	6*9=54	7*9=63	8*9=72	9*9=81
     */
    for (int i = 1; i <= 9; ++i) {
      for (int j = 1; j <= i; j++) {
        System.out.print(j + "*" + i + "=" + j * i + "\t");
      }
      System.out.println();
    }

    /*
     * A
     * AB
     * ABC
     * ABCD
     * ABCDE
     */
    for (int i = 1; i <= 5; i++) {
      char letter = 'A';
      for (int j = 1; j <= i; j++) {
        System.out.print(letter++);
      }
      System.out.println();
    }

    /*
     * 1 2 3
     * 4 5 6
     * 7 8 9
     */
    int[][] array = new int[][] {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    for (int i = 0; i < array.length; i++) {
      for (int j = 0; j < array[i].length; j++) {
        System.out.print(array[i][j] + " ");
      }
      System.out.println();
    }

    /*
     * 1 2 3
     * 4 5 6
     * 7 8 9
     */
    for (int[] ints : array) {
      for (int anInt : ints) {
        System.out.print(anInt + " ");
      }
      System.out.println();
    }
  }
}