StringBuffer and StringBuilder are mutable (Example)

//Bellow program shows that StringBuffer/StringBuilder is mutable

package StringBuffered;

public class StringObjectIsImmutable

{

public static void main(String[] arun)

{

//StringBuffered is mutable and synchronized.

StringBuffer name = new StringBuffer("Arun");

System.out.println(name);

name.append(" Kumar");

// in the above line like String object no new StringBuffered Object (name) is created. That's the reason executable time for StringBuffer/String Builder is faster than String.

System.out.println(name);

/*//StringBuffered is mutable and not synchronized

StringBuilder name = new StringBuilder("Arun");

System.out.println(name);

name.append(" Kumar");

// in the above line like String object no new StringBuffered Object (name) is created. That's the reason executable time for StringBuffer/String Builder is faster than String.

System.out.println(name);*/

}

}

Output =>

Arun

Arun Kumar