Java Data Types - learngreen.net

In the realm of Java, where code comes alive, Data types are the notes that make it thrive. Let's explore the Java data types array,  uncover the treasures they convey.

1.Primitive Data Types:- Java offers primitive data types, simple and pure, To hold fundamental values, that's for sure. Declare them with precision, let's begin, And witness the power that lies within.

// Numeric Data Types:-

byte myByte =10;

short myShort = 1000;

int myInt = 100000;

long myLong = 1000000000L;

float myFloat = 3.14f;

double myDouble = 3.14159;

// Character Data Type:-

char myChar =A;

// Boolean Data Type:-

boolean myBoolean =true;

1.Non-Primitive Data Types:- Objects Galore

Java embraces non-primitive types, objects of might, A world of possibilities, shining so bright. Arrays, strings, and classes, let's explore, And unravel the Java code's encore.

// Array Data Type:-

 int [ ] myArray = {8,5,6,9,3,7};

// String Data Type:-

 String myString = "Hello, Blogger!";

// class Data Type:-

class MyClass {

// class members and methods here

 }

3.Type Conversion and Casting : Transforming Values

In the symphony of Java, sometimes we require,
Converting and casting, a transformation to admire.
Let's widen, narrow, cast implicitly or explicitly,
To ensure the code sings harmoniously.

// Widening Conversion

int myInt = 100;

long myLong = myInt;     // Widening Conversion from int to long

// Narrowing Conversion

double myDouble = 3.14;

int myInt = (int) myDouble;   // Narrowing Conversion from double to int

// Implicit Casting

int myInt = 10; 

double myDouble = myInt;

 // Implicit Casting from int to double

// Explicit Casting

double myDouble = 3.14;

int myInt = (int) myDouble; 

// Explicit Casting from double to int

 Questions and answers related to Java Data types:-

1. What is a data type in Java?

   Answer: A data type is a classification of data that determines the possible values it can hold and the operations that can be performed on it.

2. How many primitive data types are there in Java?

   Answer: Java has eight primitive data types.

3. What are the eight primitive data types in Java?

   Answer: The eight primitive data types in Java are: byte, short, int, long, float, double, char, and boolean.

4. Which data type is used to store whole numbers in Java?

 Answer: The int data type is used to store whole numbers in Java.

5. What is the size of the int data type in Java?

 Answer: The int data type is a 32-bit signed two's complement integer, so it occupies 4 bytes of memory.

6. Which data type is used to store decimal numbers in Java?

 Answer: The double data type is commonly used to store decimal numbers in Java.

7. What is the size of the double data type in Java?

 Answer: The double data type is a 64-bit floating-point number, so it occupies 8 bytes of memory.

8. Which data type is used to store a single character in Java?

 Answer: The char data type is used to store a single character in Java.

9. What is the size of the char data type in Java?

 Answer: The char data type is a 16-bit Unicode character, so it occupies 2 bytes of memory.

10. Which data type is used to represent true/false values in Java?

 Answer: The boolean data type is used to represent true/false values in Java.

11. What is the default value of a boolean variable in Java?

Answer: The default value of a boolean variable in Java is false.

12. Which data type is used to store whole numbers with a larger range than int in Java?

Answer: The long data type is used to store whole numbers with a larger range than int in Java.

13. What is the size of the long data type in Java?

 Answer: The long data type is a 64-bit signed two's complement integer, so it occupies 8 bytes of memory.

14. Which data type is used to store small numbers in Java?

Answer: The byte data type is used to store small numbers in Java.

15. What is the size of the byte data type in Java?

 Answer: The byte data type is an 8-bit signed two's complement integer, so it occupies 1 byte of memory.

16. Which data type is used to store floating-point numbers with single precision in Java?

 Answer: The float data type is used to store floating-point numbers with single precision in Java.

17. What is the size of the float data type in Java?

 Answer: The float data type is a 32-bit floating-point number, so it occupies 4 bytes of memory.

18. What is the default value of an int variable in Java?

Answer: The default value of an int variable in Java is 0.

19. What is the default value of a char variable in Java?

Answer: The default value of a char variable in Java is '\u0000' (null character).

20. What is the default value of a double variable in Java?

Answer: The default value of a double variable in Java is 0.0.

21.What is the default value of a byte variable in Java?

Answer: The default value of a byte variable in Java is 0.

22. What is the default value of a short variable in Java?

Answer: The default