For loops in Java are a type of loop used to repeat a block of code for repeated events. For example, if you want to open a text file, you can use a loop to step through each line of the document and print it on the screen.
Similarly, games often use a “game loop”, which rotates every time a frame is refreshed to check inputs and update the locations of enemies, physics objects, etc.
watch out: How to use loops in Java
Loops are extremely powerful in Java and lend themselves to many different coding applications. In this post, we’ll explain how to use them, and look at advanced concepts like labeling.
How to use for loops in Java
It differs from the loop types in Java in that it has a fixed number of iterations. The syntax of a loop in Java is as follows:
for (declare variable; condition; increment) {
Everything inside the curly brackets (block of code) is repeated until the condition is fulfilled. for example:
Code
for (int n=1; n<=100; n++) {
System.out.println(n);
}
This will count to 100 and print the numbers to the screen.
Break and move on
Now you understand the basics of loops in Java. However, there are many advanced concepts that can help you write smarter code and better loops.
For example: Break up and move on.
Break is the keyword that ends the loop at any point. For example, this can be useful if you want to allow the user to hit “esc” to stop the game.
Code
for (int n=1; n<=100; n++) {
System.out.println(n);
if (n == 30) {
break;
}
}
In game mode, this can be useful if the player has “pause” pressed.
is reserved for loops.
There is nothing stopping you from playing for a loop in a loop. This is referred to as a “looped loop” and you can repeat this process as many times as you find necessary.
Code
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 to 100 but show the number “1” twice.
The only problem with doing this is that if you take a break or continue at any time, you will be out Each level.
Tags are useful tools for loops in Java. Tags allow you to choose exactly which loop you want to break and where you want to go in your code. You use them by simply choosing a name for your loop and then appending it before your loop code using a colon.
Code
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 are in the loop!
Now you should have a handle on how to use for loops in Java.
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