5. Loops

5.1. while

var n = 0;

while (n < 10) {
  System.out.println(n);
  n++;
}

5.2. do-while

var n = 0;

do {
  System.out.println(n);
  n++;
} while (n < 10);

5.3. for

var names = new String[] { "john", "jane", "joe", "jackson" };

for (int i = 0; i < names.length; i++) {
  System.out.println(names[i]);
}

5.4. for-each

var numbers = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
var sum = 0;

for (int x : numbers) {
  sum += x;
}

5.5. Jump statements

5.5.1. break

var numbers = new int[] { 0, 1, 2, 3, 4, 5 };

for (int i = 0; i < numbers.length; i++) {
  if (numbers[i] == 3) {
    System.out.println("found 3 at index " + i);
    break;
  }
}

var matrix = new int[][] { {0, 1}, {2, 3}, {4, 5} };

rowIter: for (int i = 0; i < matrix.length; i++) {
  for (int j = 0; j < matrix[i].length; j++) {
    if (matrix[i][j] == 3) {
      System.out.println("found 3 at i = " + i + ", j = " + j);
      break rowIter;
    }
  }
}

5.5.2. continue

var numbers = new int[] { 0, 1, 2, 3, 4, 5 };

for (int i = 0; i < numbers.length; i++) {
  if (numbers[i] % 2 == 0) {
    continue;
  }
  System.out.println("found odd number " + numbers[i] + " at index " + i);
}

var matrix = new int[][] { {0, 1, 2}, {3, 4, 5}, {6, 7, 8} };

rowIter: for (int i = 0; i < matrix.length; i++) {
  for (int j = 0; j < matrix[i].length; j++) {
    if (matrix[i][j] % 2 != 0) {
      System.out.println("found odd number " + matrix[i][j] + " at i = " + i + ", j = " + j);
      continue rowIter;
    }
  }
}