How to break a while loop from an if condition inside the while loop?

问题

I want to break a while loop of the format below which has an if statement. If that if statement is true, the while loop also must break. Any help would be appreciated.

while(something.hasnext()) {
   do something...
   if(contains something to process){
      do something
      break if condition and while loop
   }
}

回答1:

The break keyword does exactly that. Here is a contrived example:

public static void main(String[] args) {
  int i = 0;
  while (i++ < 10) {
    if (i == 5) break;
  }
  System.out.println(i); //prints 5
}

If you were actually using nested loops, you would be able to use labels.

回答2:

while(something.hasnext())
do something...
   if(contains something to process){
      do something...
      break;
   }
}

Just use the break statement;

For eg:this just prints "Breaking..."

while (true) {
     if (true) {
         System.out.println("Breaking...");
         break;
     }
     System.out.println("Did this print?");
}

回答3:

An "if" is not a loop. Just use the break inside the "if" and it will break out of the "while".

If you ever need to use genuine nested loops, Java has the concept of a labeled break. You can put a label before a loop, and then use the name of the label is the argument to break. It will break outside of the labeled loop.

来源：https://stackoverflow.com/questions/23550985/how-to-break-a-while-loop-from-an-if-condition-inside-the-while-loop