java问题，不懂，求大神赐教，问题如下：

Question

public class HelloWorld{
public static void main(String[] args) {
double[] nums = { 1.4, 1.5, 1.6, -1.4, -1.5, -1.6 };
for (double num : nums) {
test(num);
}
}

private static void test(double num) {
System.out.println("Math.floor(" + num + ")=" + Math.floor(num));
System.out.println("Math.round(" + num + ")=" + Math.round(num));
System.out.println("Math.ceil(" + num + ")=" + Math.ceil(num));
}
}
for (double num : nums)这句不知道什么意思？

Answer 1

这是增强for循环,
意思就是遍历nums, 每次循环时从nums中取出的元素赋给num.