Java 中字符串的最大长度 - 调用 length() 方法 [英] String's Maximum length in Java - calling length() method

问题描述

在 Java 中，String 对象的最大大小是多少，参考 length() 方法调用?

In Java, what is the maximum size a String object may have, referring to the length() method call?

我知道 length() 将 String 的大小作为 char [] 返回；

I know that length() return the size of a String as a char [];

推荐答案

考虑String 类'length 方法返回一个 int，该方法返回的最大长度为 Integer.MAX_VALUE，即 2^31 - 1(或大约 20 亿.)

Considering the String class' length method returns an int, the maximum length that would be returned by the method would be Integer.MAX_VALUE, which is 2^31 - 1 (or approximately 2 billion.)

在数组的长度和索引方面，(比如char[]，这可能是Strings内部数据表示的实现方式)，第 10 章:Java 语言规范，Java SE 7 版 说明如下:

In terms of lengths and indexing of arrays, (such as char[], which is probably the way the internal data representation is implemented for Strings), Chapter 10: Arrays of The Java Language Specification, Java SE 7 Edition says the following:

数组中包含的变量没有名字；相反，他们是由数组访问表达式引用使用非负整数索引值.这些变量被称为数组的组件.如果一个数组有 n 个组件，我们说 n 是数组的长度；的组成部分使用整数引用数组从 0 到 n - 1 的索引，包括在内.

The variables contained in an array have no names; instead they are referenced by array access expressions that use nonnegative integer index values. These variables are called the components of the array. If an array has n components, we say n is the length of the array; the components of the array are referenced using integer indices from 0 to n - 1, inclusive.

此外，索引必须通过 int 值，如 第 10.4 节:

Furthermore, the indexing must be by int values, as mentioned in Section 10.4:

数组必须由 int 值索引；

Arrays must be indexed by int values;

因此，似乎限制确实是 2^31 - 1，因为这是非负 int 值的最大值.

Therefore, it appears that the limit is indeed 2^31 - 1, as that is the maximum value for a nonnegative int value.

但是，可能会有其他限制，例如数组的最大可分配大小.

However, there probably are going to be other limitations, such as the maximum allocatable size for an array.

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