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How to use for loops in Java



For loops in Java

For loops in Java is just one type of loop that can be used to repeat a code block for iterative operations. For example, if you need to open a text file, you can use a loop to go through each line of the document and print it on the screen.

In the same way, games often use a “game loop” that winds every time the frame is updated to check inputs and update enemy positions, physics objects, etc.

See also: How to use loops in Java

For loops in Java are extremely powerful and suitable for many different coding applications. In this post, we will explain how to use them and look at more advanced concepts such as labeling.

How to use for loops in Java

What distinguishes a for-loop from other types of loops in Java is that it has a fixed number of iterations. The syntax for a for-loop in Java is:

for (declare variable; condition; increment) {

Everything inside the curly brackets (code blocks) is then run repeatedly until the condition is met. For example:

    for (int n=1; n<=100; n++) {
      System.out.println(n);
    }

This counts to 100 and the numbers are printed on the screen.

Break and continue

Now you understand the basics of for loops in Java. However, there are a number of more advanced concepts that can help you write smarter code and better loops.

For example: break and continue.

Break is a keyword that will end the loop at any time. This can be useful if, for example, you want the user to press "esc" to stop the game.

    for (int n=1; n<=100; n++) {
      System.out.println(n);
      if (n == 30) {
        break;
      }
    }

Continue, meanwhile, restarting the loop at the beginning. This means that you can choose to skip a part of the code block for a certain iteration.

See also: How to write your first Android game in Java

In a game scenario, this can be useful if the player presses "pause".

Nested for loops

There is nothing stopping you from playing a for loop inside a for loop. This is called a "nested loop" and you can repeat this process as many times as you deem necessary.

    for (int n=1; n<=10; n+=10) {
      System.out.println(n);
      for (int i=1; i<=100; i++) {
        System.out.println(i * n);
      }
    }

The following counts as 100 but shows the number “1” twice.

The only problem with doing this is that if you take a break or continue at any time, you will break out each level.

Labels are a useful tool that can be used for loops in Java. With labels, you can choose exactly which loop you want to break and where you want to go in your code. You use them simply by choosing a name for your loop and then adding them just before your loop code using a colon.

public static void main(String []args){

    outerloop:
        for (int n=1; n<=10; n+=10) {
            System.out.println(n);

            innerloop:
                for (int i=1; i<=100; i++) {
                System.out.println(i * n);
                if (i == 50) {
                    break innerloop;
                }
            }
        }
     }

Now you're in the loop!

Now you should take care of how to use for loops in Java.

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