The StringBuilder class is used to create mutable (modifiable) string. The StringBuilder class is same as StringBuffer class except that it is non-synchronized. It is available since JDK1.5.

Commonly used Constructors of StringBuilder class:

• • StringBuilder(): creates an empty string Builder with the initial capacity of 16.
• • StringBuilder(String str): creates a string Builder with the specified string.
• • StringBuilder(int length): creates an empty string Builder with the specified capacity as length.