Chapter 10, Problem 10.28PE

(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 MyStringBui1der2 insert(int offset. MyStringBuilder2 s);

public MyStringBuilder2 reverse();

public MyStringBuilder2 substring(1nt begin);

public MyStringBuilder2 toUpperCase();