# How do I convert decimal to binary?

In this example you will learn how to convert decimal number to binary number. To convert decimal number to binary we can use `Integer.toBinaryString()` method. This method takes a single parameter of integer and return a string that represent the equal binary number.

If you want to convert the other way around, from binary string to decimal, you can use the `Integer.parseInt()` method. This method takes two parameters. First, the string that represents a binary number to be parsed. The second parameter is the radix to be used while parsing, in case for binary number the radix is `2`.

``````package org.kodejava.example.lang;

public class IntegerToBinaryExample {
public static void main(String[] args) {
int integer = 127;
String binary = Integer.toBinaryString(integer);
System.out.println("Binary value of " + integer + " is "
+ binary + ".");

int original = Integer.parseInt(binary, 2);
System.out.println("Integer value of binary '" + binary
+ "' is " + original + ".");
}

}
``````

Here is the result of our program.

``````Binary value of 127 is 1111111.
Integer value of binary '1111111' is 127.
``````