java中的"goto"--label

java中没有goto，但是goto是保留字。例如int goto;是不合法的。

但是java中有标签，仅作用在多重循环的continue和break中。

continue和break只能作用于本层循环，但是有了标签可以直接跳出多重循环。

代码举例：

public class Main {

public static void main(String[] args) {

first: // 标签与循环直接不可以加语句
for (int i = 0; i < 3; ++i) {
System.out.println("\nfirst: " + (i + 1) + " times start");

second:
for (int j = 0; j < 2; ++j) {
System.out.println("\tsecond: " + (j + 1) + " times start");
if (i == 1 && j == 1) {
System.out.println("\t----break----");
break;
}

for (int k = 0; k < 2; ++k) {
System.out.println("\t\tthird: " + (k + 1) + " times start");
if (i == 1 && j == 0 && k == 0) {
System.out.println("\t\t----continue----");
continue;
}
if (i == 2 && j == 0) {
System.out.println("\t\t----continue second----");
continue second;
}
if (i == 2 && j == 1 && k == 1) {
System.out.println("\t\t----break first----");
break first;
}

System.out.println("\t\tthird: " + (k + 1) + " times end");
}
System.out.println("\tsecond: " + (j + 1) + " times end");
}
System.out.println("first: " + (i + 1) + " times end");
}

}

}

输出：

first: 1 times start
second: 1 times start
third: 1 times start
third: 1 times end
third: 2 times start
third: 2 times end
second: 1 times end
second: 2 times start
third: 1 times start
third: 1 times end
third: 2 times start
third: 2 times end
second: 2 times end
first: 1 times end

first: 2 times start
second: 1 times start
third: 1 times start
----continue----
third: 2 times start
third: 2 times end
second: 1 times end
second: 2 times start
----break----
first: 2 times end

first: 3 times start
second: 1 times start
third: 1 times start
----continue second----
second: 2 times start
third: 1 times start
third: 1 times end
third: 2 times start
----break first----