Java：Int Array，测量数组元素的长度
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Java: Int Array, measure the length of the array element
提问by Snow_Mac
In Java. Let's say you're given the following Array. Or something similar
在爪哇。假设您得到了以下数组。或者类似的东西
int[] anArray = {10, 20, 30, 40, 1000};
Is there a way to take the length of the array elementat anArray[4]; ?
有没有办法在 anArray[4]; 处获取数组元素的长度？?
I need to know if the array[x] is == 4. As in 2004, or 1000, or 1968.
我需要知道数组 [x] 是否为 == 4。就像在 2004 年、1000 年或 1968 年一样。
How can i do this?
我怎样才能做到这一点？
回答by Mark Byers
You can convert the element to a string and get the length of the string, or if its integers you can test if it's between 1000 and 9999.
您可以将元素转换为字符串并获取字符串的长度，或者如果它是整数，您可以测试它是否在 1000 和 9999 之间。
回答by krtek
Convert your array object to string and check is length :
将数组对象转换为字符串并检查长度：
anArray[x].toString().length
回答by WuHoUnited
You could convert the element to a string and then find the length of the string.
您可以将元素转换为字符串，然后找到字符串的长度。
You could also use repeated division by 10 in a while loop to find your answer.
您还可以在 while 循环中使用重复除以 10 来找到答案。
回答by Ted Hopp
if (Integer.toString(anArray[x]).length() == 4) {
// it's 4 long
}
回答by Mac
Slightly geekier approach:
稍微极客的方法：
int lengthOfElement4 = (int) Math.floor((Math.log(anArray[4]) / Math.log(10) + 1);
@Mark's second option will probably be quicker though...
@Mark 的第二个选项可能会更快...
