What is StringBuilder?

StringBuilder is a class, which is very similar to the StringBuffer class. It is a new concept introduced in J2SE 5. Like the String and the StringBuffer classes, it extends directly from the Object class. The StringBuilder class can act as an alternative to StringBuffer in places where the environment is not multithreaded, i.e, where synchronization or multithreading is not significant. The signature of the StringBuilder class is as follows:

public final class StringBuilder extends Object implements Serializable, CharSequence

Since StringBuilder is not synchronized, it offers faster performance than StringBuffer.

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