Java Program to illustrate the Usage of HexaDecimal

06 Jun, 2021
A decimal number is the sum of digits multiplied with a power of 10. Decimal numbers are represented with base 10 whereas hexadecimal Number is the sum of digits multiplied with the power of 16, somehow there are similar traits in the internal working of them just they are two different ways to present a number. The hexadecimal system has 16 different digit symbols. Different numbers can be generated using the combination of digits from 0 to 15. The representation in the hexadecimal system is the same as the decimal number system from 0 to 9 but then onwards it changes.
Representation:
 Decimal Number    Hexadecimal Number Equivalent
        0      —>      0
         :   :
        9      —>      9
       10      —>      A
       11      —>      B
       12      —>      C
       13      —>      D
       14      —>      E
       15      —>      F
Illustration: Internal Working
A. Decimal to Hexadecimal Number System

(1) (13)10 --> (D)16
    Directly can be writen 13 as D in hexadecimal system
     
(2) (16)10 ---> (10)16
    ( 16 )16 = ( 1 x 161) + ( 0 * 160)
  
(3) (59)10 ---> (3B)16
   ( 59 )10 --> ( 3 * 161) + (11 * 160)
Conclusion:
For a Decimal Number system-> ( 421 )10 = (4 x 102) + (2 x 101) + (1 x 100)
B. Similarly ,Hexadecimal to Decimal Number System
   (8A)16 ---> (138)10
    (8A)16 --> (8 x 161) + (10 x 160)
Conclusion:
In Java programs, hexadecimal numbers are written by placing 0x before numbers.
Below are 4 examples been discusses to illustrate the usage of Hexadecimal Number
Converting Hex number to Decimal numberConverting Decimal number to Hex numberConverting Hex number to Long numberConverting Long number to Hex number
Converting Hex number to Decimal number
Converting Decimal number to Hex number
Converting Hex number to Long number
Converting Long number to Hex number
Example 1: Java program to convert Hex number to Decimal number
Java
// Java program to convert Hex number to Decimal number // Importing input/output java libraryimport java.io.*; class GFG {     // Main driver method    public static void main(String[] args)    {         // Hexadecimal number stored in a string        String hexNum = "100";         /* Random hexadecimal number */         // Passing hexnum and base as parameters        // which is 16 to parseInt function        int decimal = Integer.parseInt(hexNum, 16);         // Printing the output result as        // decimal equivalent of hexa-decimal        System.out.println("Decimal value is " + decimal);    }}
  
Decimal value is 256
 
 Example 2: Java program to convert Decimal number to Hex number 
 
Java
// Java Program to Illustrate the Usage of HexaDecimal // Importing input/output java libraryimport java.io.*; class GFG {     // Main driver function    public static void main(String[] args)    {         /* Decimal number to be converted */        int i = 257;         // Using toHexString() method for getting decNum and        // Storing the hexaDecNum in a string        String hex = Integer.toHexString(i);         // Printing hexaDecNum of decNum        System.out.println("Hex value is " + hex);    }}
  
Hex value is 101
 
Example 3: Java program to convert Hex number to Long number
 
Java
// Java Program to Illustrate the Usage of HexaDecimal // Importing input/output java libraryimport java.io.*; class GFG {     // Main driver method    public static void main(String[] args)    {         // Hexadecimal number stored in a string        String hexNum = "10000";         // passing hexnum and base as parameters        // which is 16 to parseLong function        long num = Long.parseLong(hexNum, 16);         // Printing long value of HexaDecNum        System.out.println("Long value is " + num);    }}
  
Long value is 65536
 
Example 4: Java program to convert Long number to Hex number 
 
Java
// Java Program to Illustrate the Usage of HexaDecimal // Importing java input/output libraryimport java.io.*; class GFG {     // Main driver function    public static void main(String[] args)    {         /* Long number to be converted */        long i = 1024;         // Storing the result in a string        String hex = Long.toHexString(i);         // Displaying Result        System.out.println("Hex value is " + hex);    }}
  
Hex value is 400
 
Note: There are two more conventions for hexadecimal numbers, 400h or $400. They both are the same as 0x400.
 
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