Java Convert Hexadecimal to Decimal

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

Java Hexadecimal to Decimal conversion: Integer.parseInt()

The Integer.parseInt() method converts string to int with given redix. The signature of parseInt() method is given below:

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

public class HexToDecimalExample1{
public static void main(String args[]){
String hex="a";
int decimal=Integer.parseInt(hex,16);
System.out.println(decimal);
}}

Test it Now

Output:

Let's see another example of Integer.parseInt() method.

public class HexToDecimalExample2{
public static void main(String args[]){
System.out.println(Integer.parseInt("a",16));
System.out.println(Integer.parseInt("f",16));
System.out.println(Integer.parseInt("121",16));
}}

Test it Now

Output:

10
15
289

Java Hexadecimal to Decimal conversion: Custom Logic

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

public class HexToDecimalExample3{  
public static int getDecimal(String hex){
    String digits = "0123456789ABCDEF";
             hex = hex.toUpperCase();
             int val = 0;
             for (int i = 0; i < hex.length(); i++)
             {
                 char c = hex.charAt(i);
                 int d = digits.indexOf(c);
                 val = 16*val + d;
             }
             return val;
}
public static void main(String args[]){  
System.out.println("Decimal of a is: "+getDecimal("a"));
System.out.println("Decimal of f is: "+getDecimal("f"));
System.out.println("Decimal of 121 is: "+getDecimal("121"));
}}  

Test it Now

Output:

Decimal of a is: 10
Decimal of f is: 15
Decimal of 121 is: 289

Next TopicJava Decimal to Hex

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Java Conversion

Java Convert Hexadecimal to Decimal

Java Hexadecimal to Decimal conversion: Integer.parseInt()

Java Hexadecimal to Decimal conversion: Custom Logic

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