A 'For' loop within another 'For' loop

Question

This is the loop:
for (int i = 1; i<=5; i++) {
for (int k = 1; k<=3; k++) {
System.out.println("i is " + i + ", k is " + k);
How does it execute? After it goes through the loop i = 1, and k = 1, apparently it then doesn't go to i = 2, but instead it increments k to 2, and i remains as 1 until k is greater than 3. I'm confused how this works. Does the first loop execute first, and then the second loop executes, but then the program exits out of the second loop only when k is greater than 3?
Much appreciate your help.
Yash

Answer 1

Try to imagine expanding the loops. In the example you provided, the loops aren't that big, so it's pretty easy.
for (int i = 1; i<=5; i++) {
  for (int k = 1; k<=3; k++) {
    System.out.println("i is " + i + ", k is " + k);
}becomes
int i = 1;
  for (int k = 1; k<=3; k++) {
    System.out.println("i is " + i + ", k is " + k);
i = 2;
  for (int k = 1; k <= 3; k++) {
    System.out.println("i is " + i + ", k is " + k);
i = 3;
  for (int k = 1; k <= 3; k++) {
    System.out.println("i is " + i + ", k is " + k);
i = 4;
  for (int k = 1; k <= 3; k++) {
    System.out.println("i is " + i + ", k is " + k);
i = 5;
  for (int k = 1; k <= 3; k++) {
    System.out.println("i is " + i + ", k is " + k);
  }which becomes
int i = 1;
  int k = 1;
    System.out.println("i is " + i + ", k is " + k);
  k = 2;
    System.out.println("i is " + i + ", k is " + k);
  k = 3;
    System.out.println("i is " + i + ", k is " + k);
i = 2;
  k = 1;
    System.out.println("i is " + i + ", k is " + k);
  k = 2;
    System.out.println("i is " + i + ", k is " + k);
  k = 3;
    System.out.println("i is " + i + ", k is " + k);
i = 3;
  k = 1;
    System.out.println("i is " + i + ", k is " + k);
  k = 2;
    System.out.println("i is " + i + ", k is " + k);
  k = 3;
    System.out.println("i is " + i + ", k is " + k);
i = 4;
  k = 1;
    System.out.println("i is " + i + ", k is " + k);
  k = 2;
    System.out.println("i is " + i + ", k is " + k);
  k = 3;
    System.out.println("i is " + i + ", k is " + k);
i = 5;
  k = 1;
    System.out.println("i is " + i + ", k is " + k);
  k = 2;
    System.out.println("i is " + i + ", k is " + k);
  k = 3;
    System.out.println("i is " + i + ", k is " + k);