Java Convert Decimal to Binary

by Online Tutorials Library July 22, 2022

Java Convert Decimal to Binary

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

Java Decimal to Binary conversion: Integer.toBinaryString()

The Integer.toBinaryString() method converts decimal to binary string. The signature of toBinaryString() method is given below:

Let’s see the simple example of converting decimal to binary in java.

 public class DecimalToBinaryExample1{ public static void main(String args[]){ System.out.println(Integer.toBinaryString(10)); System.out.println(Integer.toBinaryString(21)); System.out.println(Integer.toBinaryString(31)); }} 

Test it Now

Output:

1010 10101 11111

Java Decimal to Binary conversion: Custom Logic

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

 public class DecimalToBinaryExample2{   public static void toBinary(int decimal){        int binary[] = new int[40];        int index = 0;        while(decimal > 0){          binary[index++] = decimal%2;          decimal = decimal/2;        }        for(int i = index-1;i >= 0;i--){          System.out.print(binary[i]);        }   System.out.println();//new line }   public static void main(String args[]){     System.out.println("Decimal of 10 is: "); toBinary(10);   System.out.println("Decimal of 21 is: "); toBinary(21);   System.out.println("Decimal of 31 is: ");   toBinary(31); }}     

Test it Now

Output:

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

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