Home > DeveloperSection > Forums > Breaking out of nested loops in Java
Royce Roy
Royce Roy

Total Post:134

Points:938
Posted on    May-08-2015 1:21 AM

 Java Java  Loop 
Ratings:


 1 Reply(s)
 738  View(s)
Rate this:
I've got a nested loop construct like this:

for (Type type : types) {
    for (Type t : types2) {
         if (some condition) {
             // Do something and break...
             break; // Breaks out of the inner loop
         }
    }
}
Now how can I break out of both loops. I've looked at similar questions, but none concerns Java specifically. I couldn't apply these solutions because most used gotos.

I don't want to put the inner loop in a different method.

Update: I don't want to rerun the loops, when breaking I'm finished with the execution of the loop block.


Mayank Tripathi
Mayank Tripathi

Total Post:397

Points:3117
Posted on    May-08-2015 7:01 AM

You can use break with a label for the outer loop. For example:

public class Test {
  public static void main(String[] args) {
    outerloop:
    for (int i=0; i < 5; i++) {
      for (int j=0; j < 5; j++) {
        if (i * j > 6) {
          System.out.println("Breaking");
          break outerloop;
        }
        System.out.println(i + " " + j);
      }
    }
    System.out.println("Done");
  }
}
This prints:

0 0
0 1
0 2
0 3
0 4
1 0
1 1
1 2
1 3
1 4
2 0
2 1
2 2
2 3
Breaking
Done      

2)you can use labels;
label1 : for(int i =0;;)
{
     for(int g =0;;)
     {
         break label1;
     }
}      

3)You can use a named block around the loops:
search: {
    for (Type type : types) {
        for (Type t : types2) {
            if (some condition) {
                // Do something and break...
                break search;
            }
        }
    }
}                                                            

Don't want to miss updates? Please click the below button!

Follow MindStick