在Java中查找char数组的大小

I'm making a calculator and I have converted a String to a char array using

我正在制作一个计算器，我已经将一个String转换为一个char数组

char[] b = inputString.toCharArray();

(inputString is my String variable)

（inputString是我的String变量）

Because the String is an input I don't know how large the array will be. Is there an inbuilt method that allows you to find the number of elements in the array? Thanks in advance.

因为String是一个输入，我不知道数组有多大。是否有内置方法允许您查找数组中的元素数量？提前致谢。

6 个解决方案

#1

You can use b.length to find out how many characters there are.

您可以使用b.length来查找有多少个字符。

This is only the number of characters, not indexing, so if you iterate over it with a for loop, remember to write it like this:

这只是字符数，而不是索引，所以如果你用for循环迭代它，记得像这样写：

for(int i=0;i < b.length; i++)

Note the < (not a <=). It's also important to note that since the array isn't a class, .length isn't a function, so you shouldn't have parenthesis afterward.

注意<（不是<=）。同样重要的是要注意，由于数组不是类，因此.length不是函数，所以之后不应该有括号。

#2

Don't listen to any of these guys, here, try this!

不要听任何这些家伙，在这里试试吧！

static int length(final char[] b) {
  int n = 0;
  while (true) {
    try {
      int t = b[n++];
    } catch (ArrayIndexOutOfBoundsException ex) {
      break;
    }
  }
  return n;
}

(Just kidding... try b.length.)

（开玩笑吧......试试b.length。）

#3

b.length is the way to find length of array

b.length是查找数组长度的方法

length property determines size of the array.

length属性确定数组的大小。

#4

The above answers work. Also, if for some reason you need to know the array size before you actually create the array (for pre-processing or some such activity), you can get the string's length (which will be equal to that of the array).

以上答案有效。此外，如果由于某种原因，您需要在实际创建数组之前知道数组大小（用于预处理或某些此类活动），您可以获得字符串的长度（将等于数组的长度）。

inputString.length()

#5

Once an array is created, its size is fixed. It cannot be changed. You can find its size using arrayRefVar.length. For example, myList.length returns 10.

创建数组后，其大小是固定的。它无法改变。您可以使用arrayRefVar.length找到它的大小。例如，myList.length返回10。

#6

-1

b.length; is very much handy and very much useful to find the length of char[] array:)

b.length个;找到char []数组的长度非常方便，非常有用:)

#1