There are many differences between String and StringBuffer. A list of differences between String and StringBuffer are given below:
|1)||String class is immutable.||StringBuffer class is mutable.|
|2)||String is slow and consumes more memory when you concat too many strings because every time it creates new instance.||StringBuffer is fast and consumes less memory when you cancat strings.|
|3)||String class overrides the equals() method of Object class. So you can compare the contents of two strings by equals() method.||StringBuffer class doesn't override the equals() method of Object class.|
As you can see in the program given below, String returns new hashcode value when you concat string but StringBuffer returns same.
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