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In this lecture we are discussing about:
1)StringBuffer class and StringBuilder class
2)Different method of thes class
a)capacity()
b)length()
c)append()
d)insert()
e)deleteCharAt()
f)convert to String -- toString()
and there are many method you should explore from your side
3)Difference Between StringBuilder vs StringBuffer

#1
StringBuffer class and StringBuilder class
-- string buffer and string builder class in java used to create mutable string

#2
Different method
--First Create StringBuffer object
StringBuffer sb = new StringBuffer("Hello");
--Find capacity of StringBuffer
System.out.println(sb.capacity());
-- default capacity is 16

--Find the length of StringBuffer Created String
System.out.println(sb.length());

--To append the content in existing StringBuffer object
sb.append(" World");

--To Convert StringBuffer Object into String Object
String str=sb.toString();
System.out.println(str);

-- Delete charcter of particular index
sb.deleteCharAt(3);
-- delete character at index 3

-- Insert "hi " at index 0 of existingStringBuffer Object
sb.insert(0, "Hi ");
System.out.println(sb);

#3
Difference between StringBuffer and StringBuilder
-- StringBuffer is thread safe
-- StringBuilder is not thread safe
Imp: We will discuss thread safe when we study multithreading


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