如何在Java中声明和初始化数组？ [英] How do I declare and initialize an array in Java?

问题描述

如何在Java中声明和初始化数组？

How do I declare and initialize an array in Java?

推荐答案

您可以使用数组声明或数组文字（但是只有在声明并立即影响变量时，才能使用数组文字来重新分配数组。

You can either use array declaration or array literal (but only when you declare and affect the variable right away, array literals cannot be used for re-assigning an array).

对于原始类型：

int[] myIntArray = new int[3];
int[] myIntArray = {1,2,3};
int[] myIntArray = new int[]{1,2,3};

对于类，例如 String ，它是相同：

For classes, for example String, it's the same:

String[] myStringArray = new String[3];
String[] myStringArray = {"a","b","c"};
String[] myStringArray = new String[]{"a","b","c"};

当您首先声明数组然后初始化它时，第三种初始化方法很有用。这里需要演员。

The third way of initializing is useful when you declare the array first and then initialize it. The cast is necessary here.

String[] myStringArray;
myStringArray = new String[]{"a","b","c"};

这篇关于如何在Java中声明和初始化数组？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！