OBJECT-ORIENTED THINKING - Introduction to Java Programming: Comprehensive Version - page 408

**10.28

( Implement the StringBuilder class ) The StringBuilder class is provided
in the Java library. Provide your own implementation for the following methods
(name the new class MyStringBuilder2 ):

public MyStringBuilder2();
public MyStringBuilder2( char [] chars);
public MyStringBuilder2(String s);
public MyStringBuilder2 insert( int offset, MyStringBuilder2 s);
public MyStringBuilder2 reverse();
public MyStringBuilder2 substring( int begin);
public MyStringBuilder2 toUpperCase();