java - : "Python For Else Loop" in Java 的高效实现

Question

在 Python 中有一个高效的 for ..else 循环实现描述 here

示例代码:

for x in range(2, n):
    if n % x == 0:
        print n, 'equals', x, '*', n/x
        break
else:
    # loop fell through without finding a factor
    print n, 'is a prime number'

在 Java 中，我需要编写更多代码来实现相同的行为:

finishedForLoop = true;
for (int x : rangeListOfIntegers){
    if (n % x == 0)
    {
        //syso: Some printing here
        finishedForLoop = false
        break;
    }
}
if (finishedForLoop == true){
    //syso: Some printing here
}

有没有更好的类似于Python中的for ..else循环在Java中的实现？

Answer 1

这样做是这样的:

class A {
    public static void main(String[] args) {
        int n = 13;
        found: {
            for (int x : new int[]{2,3,4,5,6,7,8,9,10,11,12})
                if (n % x == 0) {
                    System.out.println("" + n + " equals " + x + "*" + (n/x));
                    break found;
                }
            System.out.println("" + n + " is a prime number");
        }
    }
}

---

$ javac A.java && java A
13 is a prime number