How to Get Zero-Padded Binary Representations of Integers in Java?

Getting Zero-Padded Binary Representations of Integers in Java

In programming, it is often necessary to represent integers in binary format. While Java's Integer.toBinaryString() method provides binary representations, it does not add zero padding by default. This article explores how to obtain binary representations with zero padding in Java.

Zero-Padding Requirement

Suppose we have the numbers 1, 2, 128, and 256, and we want to represent them in binary with zero padding to a length of 16 digits. The desired output would be:

0000000000000001
0000000000000010
0000000010000000
0000000100000000

Standard Java Solution

Java's String.format() method allows users to specify format specifiers for padding. However, its default behavior is to use spaces for left-padding, resulting in:

               1

Customized Solution

To achieve zero-padding, we can employ a customized approach:

String binaryString = Integer.toBinaryString(1);
String zeroPaddedBinaryString = String.format("%16s", binaryString).replace(' ', '0');

Here, we first use Integer.toBinaryString() to obtain the binary representation. We then use String.format() with a format specifier of "s" to ensure a 16-digit width and left-align the binary representation. Finally, we replace the spaces with zeros using the replace() method.

Alternative Solution

Another approach is to use a custom method that adds the necessary zero padding:

public static String zeroPaddedBinary(int number) {
    String binaryString = Integer.toBinaryString(number);
    int desiredLength = 16;
    StringBuilder zeroPaddedBinaryString = new StringBuilder();
    for (int i = binaryString.length(); i < desiredLength; i++) {
        zeroPaddedBinaryString.append('0');
    }
    zeroPaddedBinaryString.append(binaryString);
    return zeroPaddedBinaryString.toString();
}

This method takes the integer, converts it to a binary string, determines the necessary zero padding, adds the zeros, and returns the zero-padded binary representation.

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