String Handling in Java

The basic aim of String Handling concept is storing the string data in the main memory (RAM), manipulating the data of the String, retrieving the part of the String etc. String Handling provides a lot of concepts that can be performed on a string such as concatenation of string, comparison of string, find sub string etc. 
Java String contains an immutable sequence of Unicode characters. Java String is differ from string in C or C++, where (in C or C++) string is simply an array of char. String class is encapsulated under java.lang package.

Immutable class in Java

Immutable class means that once an object is created, we cannot change its content. In Java, . In Java String, Integer, Byte, Short, Float, Double and all other wrapper classes are immutable.

Example of Immutable class in Java


// An immutable class
public final class Student
{
    final String name;
    final int roll_no;
 
    public Student(String name, int roll_no)
    {
        this.name = name;
        this.regNo = roll_no;
    }
    public String getName()
    {
        return name;
    }
    public int getRollNo()
    {
        return roll_no;
    }
}
 
// Driver class
class Result
{
    public static void main(String args[])
    {
        Student s = new Student("Hitesh", 18);
        System.out.println(s.name);
        System.out.println(s.roll_no);
    }
}

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