Differences between String and StringBuffer
String is an immutable class and its object can’t be modified after it is created but definitely reference other objects. They are very useful in multithreading environment because multiple threads can’t change the state of the object so immutable objects are thread safe.
String buffer is mutable classes which can be used to do operation on string object such as reverse of string, concating string and etc. We can modify string without creating new object of the string. String buffer is also thread safe.
Also, string concat + operator internally uses StringBuffer or StringBuilder class. Below are the differences.
| Sr. No. | Key | String | StringBuffer |
|---|
1
| Basic
| String is an immutable class and its object can’t be modified after it is created
| String buffer is mutable classes which can be used to do operation on string object
|
2
| Methods
| Methods are not synchronized
| All methods are synchronized in this class.
|
3
| Performance
| It is fast
| Multiple thread can’t access at the same time therefore it is slow
|
4.
| Memory Area
| I f a String is created using constructor or method then those strings will be stored in Heap Memory as well as SringConstantPool
| Heap Space
|
Example of String
public class Main {
public static void main(String args[]) {
String s1 = "Hello Tutorials Point";
String upperCase = s1.toUpperCase();
System.out.println(upperCase);
}
}Example of StringBuffer
public class StringBufferExample{
public static void main(String[] args){
StringBuffer buffer=new StringBuffer("Hi");
buffer.append("Java 8");
System.out.println("StringBufferExample" +buffer);
}
}
Published on 09-Sep-2020 12:03:46
