遍历可变长度数组 [英] Iterating through a variable length array

问题描述

如何遍历可变长度的 Java 数组.

How do I iterate over a Java array of variable length.

我想我会设置一个 while 循环，但是我如何检测到我已经到达数组的末尾.

I guess I would setup a while loop, but how would I detect that I have reached the end of the array.

我想我想要这样的东西[只需要弄清楚如何表示 myArray.notEndofArray()]

I guess I want something like this [just need to figure out how to represent myArray.notEndofArray()]

index = 0;
while(myArray.notEndofArray()){
  system.out.println(myArray(index));
  index++;
}

推荐答案

for(int i = 0; i < array.length; i++)
{
    System.out.println(array[i]);
}

或

for(String value : array)
{
    System.out.println(value);
}

第二个版本是for-each"循环，它适用于数组和集合.大多数循环都可以使用 for-each 循环来完成，因为您可能并不关心实际的索引.如果您确实关心实际索引，请使用第一个版本.

The second version is a "for-each" loop and it works with arrays and Collections. Most loops can be done with the for-each loop because you probably don't care about the actual index. If you do care about the actual index us the first version.

为了完整起见，您可以这样执行 while 循环:

Just for completeness you can do the while loop this way:

int index = 0;

while(index < myArray.length)
{
  final String value;

  value = myArray[index];
  System.out.println(value);
  index++;
}

但是当您知道大小时，您应该使用 for 循环而不是 while 循环(即使使用可变长度数组，您也知道大小......每次都不同).

But you should use a for loop instead of a while loop when you know the size (and even with a variable length array you know the size... it is just different each time).

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