#36 StringBuffer and StringBuilder in Java

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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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[@sumitwadhwa8823]

the whole point of this video should've been explaining why and when to use StringBuffer and how it is thread safe - with an example.

[@sanjanayamsani8695]

Imagine Navin sir conducting interview and the interviewe answering everything by watching his videos😅 sir be like Bro your are in😝

[@spoorthidi5544]

Yeah😂

[@neboeleyazer4186]

Doubt: Why is the capacity of the String Buffer not extending after we appending a new string or char to the existing string buffer???

[@legendleg7353]

bro you're still learning while making the video tf

[@KnowledgeAdda-y8e]

Hellosir if I doing your join chanel then you get me extra benifit

[@davidsingh-yb9yp]

any new string you create for str. gives me error Multiple markers at this line - str cannot be resolved to a variable - Syntax error on token ":", invalid AssignmentOperator

[@7stunner]

Thank You so much Navin sir for this awesome lecture!!!

[@rinadem5219]

amazing

[@davidsingh-yb9yp]

when i type (str: "navin"); it says str cannot be resolved to a varriable

[@d4ny664]

Type just ("Navin"), without 'str:'

[@kvelez]

public class Main{ public static void main(String[] args) { String word = "Hello"; StringBuffer stringBuffer = new StringBuffer(); stringBuffer.append(word); stringBuffer.insert(0, "Howdy "); stringBuffer.append(" Hi"); System.out.println(stringBuffer.toString()); System.out.println(stringBuffer.capacity()); System.out.println(stringBuffer.length()); System.out.println();//Division StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append(word); stringBuilder.insert(0, "Howdy "); stringBuilder.append(" Hi"); System.out.println(stringBuilder.toString()); System.out.println(stringBuilder.capacity()); System.out.println(stringBuilder.length()); } }

[@manojs6043]

Sir at beginning u told stringbuffer will have capacity 16, what if we assign a string length greater than 16??

[@sandeepkumarbrungi7574]

it will add 16 which is inital capacity + "your string is greater than 16"... so now the capacity will be 16 + your string length.

[@manojs6043]

@@sandeepkumarbrungi7574 Thank you bro!

[@gujjushanmukhasaipavankuma8983]

if ur String is "TELUKOO" which is of size 7, so now it will add 7+16=23

[@savelokhosa6846]

You are the best Navin

[@mounishfanofteluguguyyt]

Bro you are a telugu guy

[@puruagni1927]

Why are you not updating VS Code? Please update VS Code.

[@kirank9959]

What if we use append for String as same as like StringBuffer Now String can be mutable right? We can append to String also using append() So how to verify that now ?

[@benstokes3377]

The String class does not provide an append() method. Instead, if you need to manipulate or build strings dynamically, you should use StringBuffer or StringBuilder, which are mutable.

[@raviteja-u9u]

i love to do like add delete insert and index no nut i think u need to explain some more like this

[@theyouthmedia9451]

Thank you so Much Sir

[@SR09947]

Sir is this playlist enough to learn java completey?

[@Rob-J-BJJ]

yes mam

[@vasanthapriyaponmudi2777]

Hello Sir, public class Test { public static void main(String[] args) { StringBuffer sb = new StringBuffer("Hello"); sb.append(" World"); System.out.println(sb); System.out.println(sb.capacity()); } } Why I'm getting the capacity as 21 instead of 27?

[@viksla7]

Have you tried by keeping the "Hello World" in StringBuffer Constructor?

[@pankajdoodhwal5317]

In the StringBuffer class, when appending to a string, the capacity will not change unless the length of the appended string exceeds the difference between the current capacity and the length of the string.

[@Innainna976]

Why would anyone in right mind use VS code for java

[@benstokes3377]

its simply superior

[@narrativegatherer3128]

What is niqqa mumbling?

[@abhisheksainani]

Is string builder obsolete because string buffer is same as string builder and also threadsafe?

[@Nischit-s2z]

Stringbuilder is fast but not threadsafe.... StringBuffer is slow but threadsafe..... It depends upon the use case..... So, yeah StringBuilder is not obsolete... It's the same with vector(slow but threadsafe)and arraylist ( fast but not threadsafe)

[@petarmarcinko2846]

what do bibliotecas i need to import first

[@benstokes3377]

java.lang.StringBuffer You dont need to import any bibilotecas first because the methods shown in the video are already predefined in the standard java library class.