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:
public static int parseInt(String s,int redix)
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:
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
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Java Decimal to Hex
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