String,stringbuilder and StringBuffer differences and use scenes

This is often the case in an interview: 1. Do you know the string class? 2, String,stringbuilder and stringbuffer suitable in what kind of scene to use?

1. String Class

First look at string's source code

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Public final class String implements Java.io.Serializable, Comparable<string>, charsequence {/** the The value is used for character storage.        * Private final char value[]; /** the ' offset is ' the ' storage ' is used. */