我可以在不使用 Java 中的 .length 的情况下找出数组的长度吗
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Can I find out the length of an array without using .length in Java
提问by Sleiman Jneidi
I have the following:
我有以下几点：
int count = args.length;
Strange as it might seem I want to find out the array length without using the length field. Is there any other way?
奇怪的是，我想在不使用长度字段的情况下找出数组长度。有没有其他办法？
Here's what I already (without success) tried:
这是我已经（没有成功）尝试过的：
int count=0; while (args [count] !=null) count ++;
int count=0; while (!(args[count].equals(""))) count ++;}
采纳答案by Jeshurun
How about Arrays.asList(yourArray).size();?
怎么样Arrays.asList(yourArray).size();？
回答by Sleiman Jneidi
I don't think that there is any need to do this. However, the easiest way to do this ,is to use the enhanced for loop
我认为没有必要这样做。但是，最简单的方法是使用enhanced for loop
int count=0;
for(int i:array)
{
count++;
}
System.out.println(count);
回答by Dan Teesdale
I'm not sure why you would want to do anything else, but this is just something I came up with to see what would work. This works for me:
我不确定你为什么想要做任何其他事情，但这只是我想出来的，看看什么会起作用。这对我有用：
int count = 0;
int[] someArray = new int[5];
int temp;
try
{
while(true)
{
temp = someArray[count];
count++;
}
}
catch(Exception ex)
{
System.out.println(count);
}
回答by Rohit Tripathi
public class ArrayLength {
static int number[] = { 1, 5, 8, 5, 6, 2, 4, 5, 1, 8, 9, 6, 4, 7, 4, 7, 5, 1, 3, 55, 74, 47, 98, 282, 584, 258, 548,
56 };
public static void main(String[] args) {
calculatingLength();
System.out.println(number.length);
}
public static void calculatingLength() {
int i = 0;
for (int num : number) {
i++;
}
System.out.println("Total Size Of Array :" + i);
}
}
回答by Greg Wang
You cannot use [] to access an array if the index is out of bound.
如果索引超出范围，则不能使用 [] 访问数组。
You can use for-each loop
您可以使用 for-each 循环
for (String s: args){
count++;
}
