Java Convert Binary to Decimal

by Online Tutorials Library July 22, 2022

Java Convert Binary to Decimal

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

Java Binary 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 binary to decimal in java.

 public class BinaryToDecimalExample1{ public static void main(String args[]){ String binaryString=”1010″; int decimal=Integer.parseInt(binaryString,2); System.out.println(decimal); }} 

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Output:

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

 public class BinaryToDecimalExample2{ public static void main(String args[]){ System.out.println(Integer.parseInt(“1010”,2)); System.out.println(Integer.parseInt(“10101”,2)); System.out.println(Integer.parseInt(“11111”,2)); }} 

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Output:

10 21 31

Java Binary to Decimal conversion: Custom Logic

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

 public class BinaryToDecimalExample3{   public static int getDecimal(int binary){     int decimal = 0;     int n = 0;     while(true){       if(binary == 0){         break;       } else {           int temp = binary%10;           decimal += temp*Math.pow(2, n);           binary = binary/10;           n++;        }     }     return decimal; } public static void main(String args[]){   System.out.println("Decimal of 1010 is: "+getDecimal(1010)); System.out.println("Decimal of 10101 is: "+getDecimal(10101)); System.out.println("Decimal of 11111 is: "+getDecimal(11111)); }}   

Test it Now

Output:

Decimal of 1010 is: 10 Decimal of 10101 is: 21 Decimal of 11111 is: 31

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Java Convert Binary to Decimal

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