The String class is provided in the Java library. Provide your own implementation (name the new class MyString2) with one data field, array of characters, and the following methods: public MyString2(String s); constructor. public String getArray(); return the data field as a String. public MyString2 substring(int begin); create a new string starts at begin and return it. public MyString2 toUpperCase(); convert all characters in a string to uppercase and return it. public static MyString2 valueOf(boolean b); convert b value to string and return it. Do not use any method from StringBuilder, StringBuffer, or String classes (you can use length or charAt from class String).
