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27_[자바] return

return

Several keywords represent unconditional branching, which simply means that the branch happens without any test. These include return, break, continue, and a way to jump to a labeled statement which is similar to the goto in other languages.

The return keyword has two purposes: It specifies what value a method will return (if it doesn’t have a void return value) and it causes the current method to exit, returning that value. The preceding test( ) method can be rewritten to take advantage of this:

//: control/IfElse2.java
import static net.mindview.util.Print.*;

public class IfElse2 {
  static int test(int testval, int target) {
    if(testval > target)
      return +1;
    else if(testval < target)
      return -1;
    else
      return 0; // Match
  }
  public static void main(String[] args) {
    print(test(10, 5));
    print(test(5, 10));
    print(test(5, 5));
  }
} /* Output:
1
-1
0
*///:~

There’s no need for else, because the method will not continue after executing a return.

If you do not have a return statement in a method that returns void, there’s an implicit return at the end of that method, so it’s not always necessary to include a return statement. However, if your method states it will return anything other than void, you must ensure every code path will return a value.

 

[Thinking in Java, 99]

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