Convert decimal to binary in Java

In this post, you will learn how to convert a decimal into an equivalent binary number using the Java programming language. Here, we have mentioned two ways to convert a decimal to a binary number.

A decimal number is a base-10 number system where the range of numbers is 0,1,2,3,4,5,6,7,8,9. The main advantages of the decimal number system are easy-to-read, used by humans and easy to manipulate.

A binary number consists of two numbers 0s and 1s. It is expressed in the base-2 numeral system or binary numeral system. As the computer only understands binary language that is 0 or 1, all inputs given to a computer are decoded by it into series of 0's or 1's to process it further.

Java convert decimal to binary using Integer.toBinaryString()

Java provides a built-in Integer.toBinaryString() function to convert various values to a binary string. This function returns a binary value.

public class ConvertDecimalToBinary{  
    public static void main(String args[]){  
        System.out.println("Binary value of 10 : "+Integer.toBinaryString(10));  
        System.out.println("Binary value of 12 : "+Integer.toBinaryString(12));  
        System.out.println("Binary value of 31 : "+Integer.toBinaryString(31));  
        System.out.println("Binary value of 41 : "+Integer.toBinaryString(41));  
        System.out.println("Binary value of 24 : "+Integer.toBinaryString(24));          
    }
}  

Binary value of 10 : 1010
Binary value of 12 : 1100
Binary value of 31 : 11111
Binary value of 41 : 101001
Binary value of 24 : 11000

Java convert decimal to binary using loop

Here, we have applied the custom logic using a loop to convert decimal to binary in Java.

import java.io.*;
  
public class DecimalToBinary 
{
    // defining function to convert decimal to binary
    static void decToBinary(int num)
    {
        // array to store binary number
        int binary[] = new int[1000];
   
        // counter for binary array
        int i = 0;
        while (num > 0) 
        {
            // storing remainder in binary array
            binary[i] = num % 2;
            num = num / 2;
            i++;
        }
   
        // printing binary array in reverse order
        for (int j = i - 1; j >= 0; j--)
            System.out.print(binary[j]);
    }
      
    public static void main (String[] args) 
    {
        System.out.println("Binary representation of 12: ");
        decToBinary(12);
        
        System.out.println("\nBinary representation of 31: ");
        decToBinary(31);
        
        System.out.println("\nBinary representation of 25: ");
        decToBinary(25);
        
        System.out.println("\nBinary representation of 45: ");
        decToBinary(45);
    }
}

Binary representation of 12: 
1100
Binary representation of 31: 
11111
Binary representation of 25: 
11001
Binary representation of 45: 
101101

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