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String is a nothing but a sequence of characters within a pair of double quotes. For example - "Hello World" is a String literal, which is actually an object of String class. String is a built-in data type in C#.

Note: The String class can also be referred to as System.String or string, but in our tutorials, we will refer to String class as String.

How a String object is created?

A String object can be constructed in various ways and some are explained below -:

• A String object created from a String literal.

  String  str1 = "Hello There";

This line of code creates a new String object with a String literal value Hello There and the String object is referred by a reference variable, str1.



• A String object created from a char[ ] array.

  //Creating a char array
  char[] arr = {'H', 'e', 'y', ' ', 'T', 'h', 'e', 'r', 'e'};
  
  //Creating a String object from a char[] array.
  String str2 = new String(arr);

The above lines of code creates a String object by using the new keyword and initialize it with a value Hey There, by passing an initialized char[ ] array value to the constructor of String class. This object is assigned to a reference variable str2.



• A String object created by using + operator.

  //Creating two String objects from String literals.
  String s1 = "Hello ";
  String s2 = "You";
  
  //Creating new String object by using + operator
  String s3 = s1 + s2;

The above lines of code creates a String object by using the + operator, which adds/concatenates values of two already initialized String objects to create a new String object.


All the three ways described above create a String objects on the heap portion of memory.





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Creating and initializing String objects.


Here in program below, we have creating and initialized four String objects, each in a different way.



//C# Creating and initializing String objects in different ways. 

using System;

class String1
{
public static void Main()
{
	//Creating a char array
	char[] arr = {'N', 'e', 'w', ' ', 'Y', 'o', 'r', 'k'};

	//Creating the first String object from a char[] array.
	String str1 = new String(arr);

	//Second String object  
	String str2 = "New Delhi";		

	//Third String object.
	String str3 = "London";	

	//Printing the String objects
	Console.WriteLine("String 1 : " + str1);
	Console.WriteLine("String 2 : " + str2);
	Console.WriteLine("String 3 : " + str3);

	//Creating a new String by adding two String objects by + operator
	String str4 = str1+str2; 

	Console.WriteLine("String 4 : "+ str4);
}
}





Output is :




String 1 : New York
String 2 : New Delhi
String 3 : London
String 4 : New YorkNew Delhi





Program Analysis



• First String object is created by calling the constructor of String class and passing it a char[ ] array.
• Second String object is simply created by assigning a String literal New Delhi to the reference variable, str2 of String type.
• Third String object is also created by assigning a String literal value London to the reference variable, str3 of String type.
• Finally, the fourth String object is created by adding the first two String objects using + operator, which gives a new String object New YorkNew Delhi assigned to the reference variable, str4.






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