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Java - convert int to binary String with leading zeros

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Created by:

Palusbug

515

Short solution:

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int number = 8;
​
String binaryString = Integer.toBinaryString(number);
String withLeadingZeros = String.format("%8s", binaryString).replace(' ', '0');
​
System.out.println(binaryString);     // 1000
System.out.println(withLeadingZeros); // 00001000

In java simples way to convert int to binary String with leading zeros is to use Integer.toBinaryString(number) and String.format() method. Note that as first param in String format we pass number of leading spaces and we replace all spaces with 0.

1. Print int and binary representation of a number

Edit

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public class Example1 {
​
    public static void main(String[] args) {
​
        System.out.println("int | binary");
​
        int number = 8;
​
        String binary = Integer.toBinaryString(number);
        String padding = String.format("%8s", binary).replace(' ', '0');
        String intPadding = String.format("%3s", number);
​
        System.out.println(intPadding + " - " + padding);
    }
}

Output:

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int | binary
  8 - 00001000

2. Print int and binary representation between 0 and 8

Edit

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public class Example2 {
​
    public static void main(String[] args) {
​
        System.out.println("int | binary");
​
        for (int i = 0; i <= 8; i++) {
​
            String binary = Integer.toBinaryString(i);
            String padding = String.format("%8s", binary).replace(' ', '0');
            String intPadding = String.format("%3s", i);
​
            System.out.println(intPadding + " - " + padding);
        }
    }
}

Output:

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int | binary
- 00000000
- 00000001
- 00000010
- 00000011
- 00000100
- 00000101
- 00000110
- 00000111
- 00001000

3. Print int and binary representation between 0 and 255 - ASCII

Edit

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public class Example3 {
​
    public static void main(String[] args) {
​
        for (int i = 0; i <= 255; i++) {
​
            String binary = Integer.toBinaryString(i);
            String padding = String.format("%8s", binary).replace(' ', '0');
            String intPadding = String.format("%3s", i);
​
            System.out.println(intPadding + " - " + padding);
        }
    }
}

Output: