在Java中可变长度（动态）阵列 [英] Variable length (Dynamic) Arrays in Java

问题描述

我不知道如何初始化一个整数数组，这样它的大小和值的变化，通过了我的程序的执行，有什么建​​议？

I was wondering how to initialise an integer array such that it's size and values change through out the execution of my program, any suggestions?

推荐答案

是：使用的 ArrayList的。

在Java中，正常的阵列固定大小。你必须给他们一个的大小和不能扩大他们或收缩他们。要更改大小，你必须做出一个新的数组和复制所需的数据 - 这是低效和痛苦为你

In Java, "normal" arrays are fixed-size. You have to give them a size and can't expand them or contract them. To change the size, you have to make a new array and copy the data you want - which is inefficient and a pain for you.

幸运的是，还有各种实现常见的数据结构，以及其他有用的工具也内置类的。你要检查了Java API 6 为他们的完整列表。

Fortunately, there are all kinds of built-in classes that implement common data structures, and other useful tools too. You'll want to check the Java 6 API for a full list of them.

警告：ArrayList中只能保存对象（例如整数），而不是原语（例如整数）。在大多数情况下，<一href=\"http://java.sun.com/j2se/1.5.0/docs/guide/language/autoboxing.html\">autoboxing/autounboxing会照顾这个默默地为你，但你可以得到一些怪异的行为取决于你在做什么。

One caveat: ArrayList can only hold objects (e.g. Integers), not primitives (e.g. ints). In MOST cases, autoboxing/autounboxing will take care of this for you silently, but you could get some weird behavior depending on what you're doing.

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