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Q:
What are the differences between String and StringBuffer?

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The differences between the String and StringBuffer is given in the table below.

String :

1) The String class is immutable.

2) The String is slow and consumes more memory when you concat too many strings because every time it creates a new instance.

3) The String class overrides the equals() method of Object class. So you can compare the contents of two strings by equals() method.

String Buffer:
  1. The StringBuffer class is mutable.
  2. The StringBuffer is fast and consumes less memory when you cancat strings.
  3. The StringBuffer class doesn't override the equals() method of Object class.

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