Java Data Types: Examples of Primitive and Reference Types

Give me some Java Data Types Example

In Java, data types are divided into two main categories: primitive data types and reference data types. Here are examples of each:

Primitive Data Types

1. int: Represents a 32-bit signed integer.

   int age = 25;
   

2. double: Represents a double-precision 64-bit floating point.

   double salary = 55000.50;
   

3. char: Represents a single 16-bit Unicode character.

   char initial = 'A';
   

4. boolean: Represents a value that can be either true or false.

   boolean isJavaFun = true;
   

5. float: Represents a single-precision 32-bit floating point.

   float pi = 3.14f; // Note the 'f' suffix
   

6. byte: Represents an 8-bit signed integer.

   byte smallNumber = 100;
   

7. short: Represents a 16-bit signed integer.

   short mediumNumber = 10000;
   

8. long: Represents a 64-bit signed integer.

   long largeNumber = 100000L; // Note the 'L' suffix
   

Reference Data Types

1. String: Represents a sequence of characters.

   String greeting = "Hello, World!";
   

2. Arrays: A collection of elements of the same type.

   int[] numbers = {1, 2, 3, 4, 5};
   

3. Classes: User-defined data types that can contain fields and methods.

   class Person {
       String name;
       int age;
       
       Person(String name, int age) {
           this.name = name;
           this.age = age;
       }
   }
   
   Person person = new Person("Alice", 30);
   

4. Interfaces: A reference type in Java, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types.

   interface Animal {
       void makeSound();
   }
   
   class Dog implements Animal {
       public void makeSound() {
           System.out.println("Woof");
       }
   }
   

5. Collections: Such as ArrayList, HashMap, etc.

   import java.util.ArrayList;
   
   ArrayList<String> fruits = new ArrayList<>();
   fruits.add("Apple");
   fruits.add("Banana");
   

These examples illustrate the basic data types available in Java, both primitive and reference types. Each type serves different purposes and is used based on the requirements of the program.