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Posted 2020-11-06 aLa神灯

    // : LabeledFor.java
    // Java’s "labeled for loop"
    public class LabeledFor {
        
        /**
         *  是后面跟着一个冒号的标识符
         *  
         *  放在循环前面
         * @param args
         */
        
        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++) {
                    prt("i = " + i);
                    if (i == 2) {
                        prt("continue");
                        continue;
                    }
                    if (i == 3) {
                        prt("break");
                        i++; // Otherwise i never
                        // gets incremented.
                        break;
                    }
                    if (i == 7) {
                        prt("continue outer");
                        i++; // Otherwise i never
                        // gets incremented.
                        continue outer;
                    }
                    if (i == 8) {
                        prt("break outer");
                        break outer;
                    }
                    for (int k = 0; k < 5; k++) {
                        if (k == 3) {
                            prt("continue inner");
                            continue inner;
                        }
                    }
                }
            }
            // Can‘t break or continue
            // to labels here
        }

        static void prt(String s) {
            System.out.println(s);
        }
    } // /:~