The StringBuffer type In Java:

A more typical class type in Java, in terms of object creation, is StringBuffer, which can be used to handle sequences of characters. A StringBuffer object is mutable: it can be changed once it has been created.

However, to create a StringBuffer object we cannot simply write a string literal.The following would be illegal:

StringBuffer userName;
userName = "Jones21"; // illegal!

The reason is that the expression on the right-hand side of this assignment is a String, and we are trying to assign it to a reference variable of a different type, StringBuffer.

To make a StringBuffer object, we require a completely different syntax:

new StringBuffer("Jones21")

This uses the keyword new with the type of the object being created (StringBuffer) and an argument ("Jones21", in this case) that allows initialization of the object. For the time being, do not worry too much about this syntax. 

Normally you would write such an expression on the right-hand side of an assignment, as follows:

StringBuffer userName;
userName = new StringBuffer("Jones21");

The first line here creates the reference variable, while the second makes the reference refer to a StringBuffer object.

Why is there different syntax to create a String and a StringBuffer? The answer is that creating strings is a common task and so Java provides the shortcut we have been using. This is a special feature provided for strings!

However, a String is an object and all objects can be created in the manner used for StringBuffer above: using the keyword new, the name of the type and some initializing data. In this case, we can write:

String filename;
/* create string using new */
filename = new String("Tdata.txt");

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