## DEV Community

Rajesh Mishra

Posted on • Originally published at onlinetutorials.tech on

# Binary to Decimal Java How To Convert Binary To Decimal In Java

There are a multiple way to convert binary to decimal in Java:

#### Convert Binary To Decimal In Java Interger.parseInt() method:

This is really one of the simplest way in java to get Decimal number in java:

package com.onlinetutorials.tech;
public class ConvertBinaryToDecimalInJava {
public static void main(String args[]){
String binarynumber="10101";
int decimalnumber=Integer.parseInt(binarynumber,2);
System.out.println(decimalnumber);
}
}

Output of above program after executions would be: 21.

Example:

package com.onlinetutorials.tech;
public class ConvertBinaryToDecimalInJava {
public static void main(String args[]){
System.out.println(Integer.parseInt("1110",2));
System.out.println(Integer.parseInt("0010",2));
System.out.println(Integer.parseInt("1010",2));
System.out.println(Integer.parseInt("0110",2));
System.out.println(Integer.parseInt("1101",2));
}
}

Output of above program after executions would be:
14
2
10
6
13

## Java program for Binary To Decimal using custom logic:

package com.onlinetutorials.tech;
public class ConvertBinaryToDecimalInJava {
public static int retrieveDecimal(int binarynumber){
int decimalnumber = 0;
int power = 0;
while(true){
if (binarynumber == 0){
break;
}else{
int temp = binarynumber%10;
decimalnumber += temp*Math.pow(2, power);
binarynumber = binarynumber/10;
power++;
}
}
return decimalnumber;
}
public static void main(String args[]){
System.out.println("Decimal value is: "+retrieveDecimal(1110));
System.out.println("Decimal value is: "+retrieveDecimal(0010));
System.out.println("Decimal value is: "+retrieveDecimal(1010));
System.out.println("Decimal value is: "+retrieveDecimal(0110));
System.out.println("Decimal value is: "+retrieveDecimal(1101));
}
}

Output of above program after executions would be:
14
8
10
16
13

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