Difference between String and Stringbuffer in Java

String	Stringbuffer
String is immutable.	It is mutable.
It is slow in terms of executing the concatenation task.	It is fast in terms of executing the concatenation task.
Here the length of the string class is static.	Here the length can be modified whenever required, as it is dynamic in behaviour.
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.
String class uses String constant pool.	StringBuffer uses Heap memory.
String consumes more as compared to the stringbuffer.	StringBuffer uses less memory as compared to the string.
It utilises a string constant pool to store the values.	It prefers heap memory to store the objects.
It overrides both equal() and hashcode() techniques of object class.	It cannot override equal() and hashcode() methods.

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