Convert decimal to hexadecimal in Java

In this post, you will learn how to convert decimal to hexadecimal using the Java programming language.

A decimal number is a base-10 number system. It ranges from 0 to 9 i.e., 0,1,2,3,4,5,6,7,8,9. Any combination of digits is a decimal number such as 61, 22, 912, 0, 5 etc. The main advantages of the decimal number system are easy-to-read, used by humans and easy to manipulate.

Hexadecimal describes a base-16 number system. Hexadecimal Number System is generally used in computer programming and Microprocessors. It is also helpful to describe colours on web pages. The main advantage of a Hexadecimal Number is that it is exceptionally compact and by utilizing a base of 16 means that the number of digits used to address a given number is normally less than in binary or decimal.

Java program to convert decimal to hexadecimal using Integer.toHexString()

Java provides a built-in Integer.toHexString() function to convert various values to a hexadecimal number. This function returns hexadecimal value.

// Java program to convert decimal to hexadecimal

public class DecimalToHexExample1{  
    public static void main(String args[]){  
        System.out.println("10 : "+Integer.toHexString(10));  
        System.out.println("26 : "+Integer.toHexString(26));  
        System.out.println("5 : "+Integer.toHexString(5));  
        System.out.println("14 : "+Integer.toHexString(14));  
        System.out.println("16 : "+Integer.toHexString(16));  
    }
}  

10 : a
26 : 1a
5 : 5
14 : e
16 : 10

Java convert decimal to hexadecimal using Loop

For converting a decimal to hexadecimal, the standard mathematical approach is to divide the number by 16 until it reduces to zero. The sequence of remainders from last to first in a hex structure is the hexadecimal number system of the given decimal number. The following example demonstrates this -

public class DecimalToHex
{
   public static void main(String args[])
   {
        int num = 26;
        // For storing remainder
        int rem;
        
        // For storing result
        String result=""; 
        
        // Digits in hexadecimal number system
        char hex[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
        
        while(num>0)
        {
        rem=num%16; 
        result=hex[rem]+result; 
        num=num/16;
        }
        System.out.println("Decimal to hexadecimal: "+result);
       
   }
}   

Decimal to hexadecimal: 1A

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