#34 What is String in Java

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In this lecture we are discussing:
1)What is String?
2)How to create String object?
3)hashcode
4)Concatenation operator
5)Some method of String class

#1
— If you want to store character sequence e.g “shiva”, “navin”, “hyder” in
such cases we need character array or String (non-primitive data ) .
— But Using String object it is easy to store sequence of character.

— String is non primitive data-type and it is also a class.
String str=”shiva”;

#2
How to create String object?
— using new operator String str=new String(“shiva”);
— directly assigning String str=”shiva”; put sequence of character inside a double quotes.

#3
What is hashcode?
— hashcode is unique number for each object created in heap.
— hashcode is used to identify object.

#4
Concatenation operator
— + operator used to concatenate the String
String firstName=”shiva”;
String lastName=”srivastava”;
String fullName=firstName+lastName;
System.out.println(fullName); //shivasrivastava

#5
some method used in String
a) int length() –to find the length of String
b) char charAt(int index) –to find character at particular index

System.out.println(str.charAt(0));
System.out.println(str.length());

Note: In array length is property while in String length() is method.

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