Data Types in Java

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This tutorial will teach you how to understand what are the variables in java. A data type refers to the type of data that can be stored in a variable, means that a variable needs a data type to save space in the memory for allocation.

So, now let's start this tutorial!

1. Open JCreator or NetBeans and make a java program with a file name of variables.java.

2. Now, we will initialize variables with their own data types in java.

An int data type contains a whole number. It is 32-bit signed two's complement integer,

  1. int shirtID = 0;

A String data type contains text and numbers.

  1. String description = "-description required-";

A char data type contains only a single character.

  1. char colorCode = 'U';

A double data type contains a decimal value of numbers.

  1. double price = 12.01;

A boolean data type returns only a True or False value.

  1. boolean good = true;

A byte data type contains a small value of integer. It is four times smaller than an int and is used to save space in large arrays.

  1. byte num = 24;

3. To display the declared variables in their different data types, have this code below:

  1. System.out.println("Shirt ID: " + shirtID);
  2. System.out.println("Shirt description:" + description);
  3. System.out.println("Color Code: " + colorCode);
  4. System.out.println("Shirt price: " + price);
  5. System.out.println("Good? " + good);
  6. System.out.println("Number of bytes: " + num);

Output:

output
Here's the full code of this tutorial:

  1. public class variables {
  2.  
  3. public static void main (String args[]) {
  4.  
  5. int shirtID = 0;
  6. String description = "-description required-";
  7. char colorCode = 'U';
  8. double price = 12.01;
  9. boolean good = true;
  10. byte num = 24;
  11.  
  12. System.out.println("Shirt ID: " + shirtID);
  13. System.out.println("Shirt description:" + description);
  14. System.out.println("Color Code: " + colorCode);
  15. System.out.println("Shirt price: " + price);
  16. System.out.println("Good? " + good);
  17. System.out.println("Number of bytes: " + num);
  18. }
  19.  
  20.  
  21. }

For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below.

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