What is String?
When it comes to Java, a string is considered as an object that defines a sequence of char values. In Java, arrays are unchangeable, likewise strings are unchangeable as well. In any case, if a modification happens in a string, a completely new string is constructed.
What is StringBuffer?
StringBuffer is the equivalent class of the class string. The class StringBuffer delivers more functionality to the other class strings. We can make changes here because the StringBuffer is mutable.
Difference between String and StringBuffer in Java
| S. No. | String | StringBuffer |
| 1 | String is immutable. | It is mutable. |
| 2 | It is slow in terms of executing the concatenation task. | It is fast in terms of executing the concatenation task. |
| 3 | Here the length of the string class is static. | Here the length can be modified whenever required, as it is dynamic in behaviour. |
| 4 | It is less efficient. | It is more efficient in nature as compared to the string class. |
| 5 | String consumes more as compared to the stringbuffer. | StringBuffer uses less memory as compared to the string. |
| 5 | It utilises a string constant pool to store the values. | It prefers heap memory to store the objects. |
| 6 | It overrides both equal() and hashcode() techniques of object class. | It cannot override equal() and hashcode() methods. |
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