StringBuffer class in Java (2)

StringBuffer class in Java

Purpose: how to use StringBuffer class in Java 

How do I save memory and CPU? 

One of the solution is to use a class "springbuffet" 

Fomula : 

Stringbuffet       title     =      new     Stringbuffet(  );

                    (random name)      (execution)

title.append("         ");

title.append("         ");

retrun title.toString( );

 

Why error box on "Return title" ? 

Since the class is "String type", need to exchange it to string!