String Handling in Java

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.

// 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);
    }
}

Character

It is an identifier enclosed within single quotes (' ').
Example: 'A', '$', 'p'

String:

String is a sequence of characters enclosed within double quotes (" ") is known as String.
Example: "Java Programming".

In java programming to store the character data we have a fundamental datatype called char. Similarly to store the string data and to perform various operation on String data, we have three predefined classes they are:

• String
• StringBuffer
• StringBuilder