字符串、StringBuffer 和 StringBuilder

问题描述

请告诉我一个实时情况来比较String、StringBuffer和StringBuilder?

Please tell me a real time situation to compare String, StringBuffer, and StringBuilder?

推荐答案

可变性差异:

String 是不可变的，如果您尝试更改它们的值，则会创建另一个对象，而 StringBuffer 和 StringBuilder 是可变的，因此它们可以更改其值.

String is immutable, if you try to alter their values, another object gets created, whereas StringBuffer and StringBuilder are mutable so they can change their values.

线程安全差异:

StringBuffer 和 StringBuilder 的区别在于 StringBuffer 是线程安全的.因此，当应用程序只需要在单个线程中运行时，最好使用 StringBuilder.StringBuilder 比 StringBuffer 效率更高.

The difference between StringBuffer and StringBuilder is that StringBuffer is thread-safe. So when the application needs to be run only in a single thread then it is better to use StringBuilder. StringBuilder is more efficient than StringBuffer.

情况:

• 如果您的字符串不会改变，请使用 String 类，因为 String 对象是不可变的.
• 如果您的字符串可以更改(例如:字符串构造中的大量逻辑和操作)并且只能从单个线程访问，则使用 StringBuilder 就足够了.
• 如果您的字符串可以更改，并且可以从多个线程访问，请使用 StringBuffer，因为 StringBuffer 是同步的，因此您具有线程安全性.

• If your string is not going to change use a String class because a String object is immutable.
• If your string can change (example: lots of logic and operations in the construction of the string) and will only be accessed from a single thread, using a StringBuilder is good enough.
• If your string can change, and will be accessed from multiple threads, use a StringBuffer because StringBuffer is synchronous so you have thread-safety.

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