Java Convert Decimal to Hexadecimal

Last Updated : 17 Feb 2026

We can convert decimal to hexadecimal in java using Integer.toHexString() method or custom logic.

Java Decimal to Hex conversion: Integer.toHexString()

The Integer.toHexString() method converts decimal to hexadecimal. The signature of toHexString() method is given below:

Let's see the simple example of converting decimal to binary in java.

public class DecimalToHexExample1{
public static void main(String args[]){
System.out.println(Integer.toHexString(10));
System.out.println(Integer.toHexString(15));
System.out.println(Integer.toHexString(289));
}}

Output:

a
f
121

Java Decimal to Hex conversion: Custom Logic

We can convert decimal to hex in java using custom logic.

public class DecimalToHexExample2{  
public static String toHex(int decimal){  
     int rem;
     String hex=""; 
     char hexchars[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
    while(decimal>0)
     {
       rem=decimal%16; 
       hex=hexchars[rem]+hex; 
       decimal=decimal/16;
     }
    return hex;
}  
public static void main(String args[]){    
     System.out.println("Hexadecimal of 10 is: "+toHex(10));
     System.out.println("Hexadecimal of 15 is: "+toHex(15));
     System.out.println("Hexadecimal of 289 is: "+toHex(289));
}}    

Output:

Hexadecimal of 10 is: A
Hexadecimal of 15 is: F
Hexadecimal of 289 is: 121

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