Data Types in Java

Submitted by donbermoy on Saturday, December 27, 2014 - 10:41.

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,

int shirtID = 0;

A String data type contains text and numbers.

 String description = "-description required-";

A char data type contains only a single character.

char colorCode = 'U';

A double data type contains a decimal value of numbers.

double price = 12.01;

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

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.

        byte num = 24;

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

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

Output: output

Here's the full code of this tutorial:

public class variables {
 
   public static void main (String args[]) {
        
        int shirtID = 0;
        String description = "-description required-";
        char colorCode = 'U';
        double price = 12.01;
        boolean good = true;
        byte num = 24;
        
        System.out.println("Shirt ID: " + shirtID);
        System.out.println("Shirt description:" + description);
        System.out.println("Color Code: " + colorCode);
        System.out.println("Shirt price: " + price);
        System.out.println("Good? " + good);
        System.out.println("Number of bytes: " + num);
   }
     
    
}

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