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1.Explain the difference between class and instance methods/members.How can 
this be expressed in your code?
2.Can class methods/members be used in instance methods? Explain why (not).
3.Can class instance methods/members be used in class methods? Explain why (
not).
4.In software engineering,solutions to common design problems are often call
ed design patterns. One of them is called Singleton and it describes how one
 can make sure that a certain class can have only instance during a program'
s life-cycle.How would you implement such a Singleton class in Java?
5.How would you check that you can indeed have only one instance?
6.Expalin the following lines of code(assume they are correct):
  (1) public static final int LEN=100;
  (ii) protected final void outputString(char a)
  (iii) private GreatRace()
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