Breaking nested loop and main loop [duplicate]

Question

This question already has an answer here:

• How do I break out of nested loops in Java? 35 answers

I have the following code:

int x = 100; //Or some other value

while(x > 0) {

    for(int i = 5; i > 0; i++) {

        x = x-2;

        if(x == 0)
            break;

        }

}

However, this will only break the for loop. How can I have it so that it breaks both the for and the while loops?

Cheers!

Answer 1

You can use a labeled break, which redirects the execution to after the block marked by the label:

OUTER:
while(x > 0) {
    for(int i = 5; i > 0; i++) {
        x = x-2;
        if(x == 0)
            break OUTER;
    }
}

Although in that specific case, a simple break would work because if x == 0 the while will exit too.

Answer 2

bool done=false;
while(!done && x > 0) {
    for(int i = 5;!done &&  i > 0 ; i++) {
        x = x-2;
        if(x == 0){
            done=true;
            break ;
        }
    }
}

Answer 3

See this example

Outer:
    for(int intOuter=0; intOuter < intArray.length ; intOuter++)
    {
      Inner:
      for(int intInner=0; intInner < intArray[intOuter].length; intInner++)
      {
        if(intArray[intOuter][intInner] == 30)
        {
          blnFound = true;
          break Outer;
        }  

      }
    }

Answer 4

Try to avoid breaks, there's always an other way to write your loop so you don't need it which is much 'prettier' and easier to understand if someone else has to modify your code. In your example the while loop is unnecessary but to show you how it's possible:

while(x > 0) {

  for(int i = 5; i > 0 && x!=0; i++) {

    x = x-2;

  }

}

If x equals 0, the for-loop will be left. Then your while condition will be verified: x is smaller then 0 (it's zero) so your while loop will stop executing too.