Question

What is StringBuffer? What is difference between String and StringBuffer?

Answer 1

The StringBuffer is a class which is alternative to the String class. But StringBuffer class is more flexible to use than the String class. That means, using StringBuffer we can insert some components to the existing string or modify the existing string but in case of String class once the string is defined then it remains fixed. The StringBuffer and the StringBuffer are almost one and the same. The StringBuffer or StringBuilder have three constructors and 30 methods.