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String Buffer Class

This article provides a comprehensive overview of Java's StringBuffer class, which represents a mutable sequence of characters. It covers its constructors, including default and capacity-specific options, and explains the importance of capacity in storing characters without resizing. The article details essential methods such as append(), insert(), replace(), and reverse(), demonstrating how to manipulate string content efficiently. With practical examples, you'll learn how to effectively use StringBuffer to manage and modify strings in Java programming.

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String Buffer Class

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  1. String Buffer Class An object of String buffer represents mutable sequence of character. Constructor:- Public StringBuffer(); Public StringBuffer(int capacity); Public StringBuffer(String s); E.g. stringBuffer s=new StringBuffer(); StringBuffer t=new StringBuffer(10); StringBuffer u=new StringBuffer(“ABC”);

  2. Each StringBuffer Object has a initial capacity that represents maximum number of characters that can be stored in the stringBuffer object without changing its size. • Capacity of a stringBuffer object can be found with the help of capacity method . • Public int capacity(); • S.O.P(s.capacity()); 16 • S.O.P(t.capacity()); 10 • S.O.P(u.capacity()); 19 • Default capacity of a string Buffer object is 16.

  3. Methods of string Class :- • Append():- is used at the contents of a string at the end of invoking string buffer Object. • Public StringBuffer append(String s); • StringBuffer s= new StringBuffer(“ABC”); • StringBuffer t=s.append(“DEF”); • S.o.P(s);//ABCDEF • S.O.p(t);//ABCDEF • S.o.p(s==t); True NOTE:returns of S.B. class that changes the contents of S.B. Object returns the reference of invoking object so that method cal can be chain.

  4. Ex:StringBuffer s=new StringBuffer(“ABC”); • S.append(“ABC”).insert(3,”PQR”); • s.insert(3,”PQR”); • insert():- • It is used to insert a string at the specified position in a stringBuffer object. • Public StringBuffer insert(int index, String s); • replace():-it is used contents at the specified index from the specified string . • Public StringBuffer replace(int start index, int end index; string s);

  5. Stringbuffer a=new StringBuffer(“abc”); • a.append(“pqr”).insert(2,”xyz”);//abcpqr&abxyzcpqr • replace(0,1,”mno”); //mnobxyzcpqr • Reverse():- • Public stringBuffer reverse(); • toString():- public String toString();

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