Java和Kotlin for循环语法之间的区别? [英] Difference between Java and Kotlin for-loop syntax?

问题描述

我最近开始学习Kotlin，我注意到的一件事是Kotlin的for-loop语法不同于传统的for-loop语法，对我来说有点混乱...我试图在Google上搜索它，但没有没有得到我的答案.

I recently started learning Kotlin and the one thing I noticed is the for-loop syntax of Kotlin is different from traditional for-loop syntax and for me it is a bit confusing...I tried to search it on google but didn't get my answer.

如何复制以下Java for循环?

for (int i = 0; i <= 100; i++) {
  System.out.println(i);
}

推荐答案

这是一个Java for循环，可迭代100次:

for (int i = 0; i <= 100; i++) {
  System.out.println(i);
}

以下是Kotlin等效项:

for (i in 0..100) {
  println(i)
}

这是一个Java for循环，它将循环访问列表:

for (int i = 0; i < list.size(); i++) {
  Object item = list.get(i);

  // Do something with item
}

等效于Kotlin:

for (i in list.indices) {
  val item = list[i]

  // Do something with item
}

这是另一个Kotlin等效项，用于迭代列表:

Here is another Kotlin equivalent for iterating a list:

for (i in 0 until list.size) {
  val item = list[i]

  // Do something with item
}

Java for-each循环:

for (Object item : list) {
  // Do something with item
}

Kotlin for-each循环:

for (item in list) {
  // Do something with item
}

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