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

Next TopicJava Hex to Decimal

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