What is Datatype?
--> Data types specify the different sizes and values that can be stored in the variable.
--> Java is a statically-typed programming language. It means, all variables must be declared before its use. That is why we need to declare variable's type and name.
--> Data types in Java are of different sizes and values that can be stored in the variable that is made as per convenience and circumstances to cover up all test cases.
There are two types of data types in Java:
1. Primitive data types: The primitive data types include boolean, char, byte, short, int, long, float and double.
2. Non-primitive data types: The non-primitive data types include Strings ,Classes, Interfaces, and Arrays.
Java Primitive Data Types:
--> In Java language, primitive data types are the building blocks of data manipulation.
--> The primitive data types include boolean, char, byte, short, int, long, float and double.
--> Primitive data are only single values and have no special capabilities.
Non-Primitive Data Types in Java:
-->The Non-Primitive (Reference) Data Types will contain a memory address of variable values because the reference types won’t store the variable value directly in memory.
-->In Java, non-primitive data types, also known as reference data types, are used to store complex objects rather than simple values.
-->The non-primitive data types include Strings ,Classes, Interfaces, and Arrays.
Class:
One common non-primitive data type in Java is the class. Classes are used to create objects, which are instances of the class. A class defines the properties and behaviors of objects, including variables (fields) and methods. For example, you might create a Person class to represent a person, with variables for the person's name, age, and address, and methods to set and get these values.
Strings:(TBD)
Strings are defined as an array of characters. The difference between a character array and a string in Java is, that the string is designed to hold a sequence of characters in a single variable whereas, a character array is a collection of separate char-type entities. Unlike C/C++, Java strings are not terminated with a null character.
Arrays:(TBD)
Arrays are a fundamental non-primitive data type in Java that allow you to store multiple values of the same type in a single variable. Arrays have a fixed size, which is specified when the array is created, and can be accessed using an index. Arrays are commonly used to store lists of values or to represent matrices and other multi-dimensional data structures.
Interface:(TBD)
Interfaces are another important non-primitive data type in Java. An interface defines a contract for what a class implementing the interface must provide, without specifying how it should be implemented. Interfaces are used to achieve abstraction and multiple inheritance in Java, allowing classes to be more flexible and reusable.
Example program:
source code:
public class Players
{
int score;
float strike_rate;
public static void main(String[] args)
{
Players player1 = new Players();
Players player2 = new Players();
player1.score = 100;
player2.score = 80;
player1.strike_rate = 78.4f;
player2.strike_rate = 65.0f;
System.out.println(player1.score);
System.out.println(player2.strike_rate);
}
}
Output:
100
65.0
Task:
source code:
public class Hotel
{
int amount;
float quantity;
public static void main(String args[])
{
Hotel food1 = new Hotel();
Hotel food2 = new Hotel();
food1.amount =100;
food1.quantity = 50.5f;
food2.amount = 200;
System.out.println( food1.amount);
System.out.println( food2.quantity);
}
}
Output:
100
0.0
Reference:
https://www.javatpoint.com/java-data-types
https://www.geeksforgeeks.org/data-types-in-java/
https://monad.edu.in/img/media/uploads/data%20types%20in%20java.pdf
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