labeledfor.java

来自「thinking in java 书中源码 第四版」· Java 代码 · 共 63 行

//: control/LabeledFor.java
// For loops with "labeled break" and "labeled continue."
import static net.mindview.util.Print.*;

public class LabeledFor {
  public static void main(String[] args) {
    int i = 0;
    outer: // Can't have statements here
    for(; true ;) { // infinite loop
      inner: // Can't have statements here
      for(; i < 10; i++) {
        print("i = " + i);
        if(i == 2) {
          print("continue");
          continue;
        }
        if(i == 3) {
          print("break");
          i++; // Otherwise i never
               // gets incremented.
          break;
        }
        if(i == 7) {
          print("continue outer");
          i++; // Otherwise i never
               // gets incremented.
          continue outer;
        }
        if(i == 8) {
          print("break outer");
          break outer;
        }
        for(int k = 0; k < 5; k++) {
          if(k == 3) {
            print("continue inner");
            continue inner;
          }
        }
      }
    }
    // Can't break or continue to labels here
  }
} /* Output:
i = 0
continue inner
i = 1
continue inner
i = 2
continue
i = 3
break
i = 4
continue inner
i = 5
continue inner
i = 6
continue inner
i = 7
continue outer
i = 8
break outer
*///:~