How StringBuffer Class is different from StringBuilder Class in Java

Table of Contents

In this article, we will look into how StringBuffer class is different from StringBuilder Class in Java. A StringBuffer Class is same as String Class with only exceptions that it is mutable which means it can be changed while String Class is Immutable as it cannot be changed. On the other hand if we talk about StringBuilder Class then it is primarily created to replace the StringBuffer Class in places where single thread needs to call the StringBuffer Class.

What is Immutable

Any object which does not change its state is known as Immutable. Since it cannot change its state so it cannot be edited or changed or corrupted by any other thread. String Class in Java can be the best example for this.

What is Mutable

Any object whose state can be changed is known as Mutable. By default all the objects in Java(except strings which are immutable) are Mutable. Any programmers who wants to change or set some value, they need to use mutable objects.

How StringBuffer Class is different from StringBuilder Class in Java

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StringBuffer Class

It is thread safe class.
It is synchronized which means two different threads cannot call the StringBuffer Class simultaneously.
It is mutable which means it changes its value.
It is introduced in JDK 1.0.
It extends java.lang.Object Class.
Some of the important methods of this class are append() and insert() methods which are overloaded methods.
StringBuffer implements Serializable, Appendable and CharSequence.
It is slower as it provides synchronization. Check more about StringBuffer on Java Official Page.

Program Example 1

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuffer sb = new StringBuffer("CyberITHub");
sb.insert(5,"hello");
System.out.println(sb);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
CyberhelloITHub

Program Example 2

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuffer sb = new StringBuffer("CyberITHub");
sb.append("hello");
System.out.println(sb);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
CyberITHubhello

Program Example 3

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuffer sb = new StringBuffer("CyberITHub");
sb.reverse();
System.out.println(sb);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
buHTIrebyC

Program Example 4

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuffer sb = new StringBuffer("CyberITHub");
int slen = sb.length();
System.out.println(slen);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
10

StringBuilder Class

It is not a thread safe class.
It is non-synchronized which means two different threads can call the StringBuilder Class simultaneously.
It is mutable which means it changes its value.
It is introduced in JDK 1.5.
It extends java.lang.Object Class.
Some of the important methods are append() and insert() methods which are overloaded methods.
StringBuilder implements Serializable, Appendable and CharSequence.
It is faster as it does not provide any synchronization. Check More about StringBuilder on Java Official Page.

Program Example 1

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("CyberITHub");
sb.insert(5,"hello");
System.out.println(sb);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
CyberhelloITHub

Program Example 2

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("CyberITHub");
sb.append("hello");
System.out.println(sb);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
CyberITHubhello

Program Example 3

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("CyberITHub");
sb.reverse();
System.out.println(sb);
}
}

Compile Your Program

[root@localhost ~]# javac Example.java

Run Your Program

[root@localhost ~]# java Example
buHTIrebyC

Program Example 4

[root@localhost ~]# vi Example.java
import java.io.*;

class Example
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("CyberITHub");
int slen = sb.length();
System.out.println(slen);
}
}

Compile Your Program