How to convert decimal to binary and format it in a specific way?

Question

When using the Integer.toBinaryString() method to convert decimal to binary my program keeps returning the binary code without the leading 0's in the binary representation. How can I make sure that the zeros aren't lost? For example if the code is:

String binary = Integer.toBinaryString(84);

I get 1010100 instead of 01010100

How can I make sure that the leading zero doesn't disappear ?

`String binary = Integer.toBinaryString(84)` convert decimal to binary not ascci to binary. — Masudul, Dec 12 '13 at 13:32
possible duplicate of [How to get 0-padded binary representation of an integer in java?](http://stackoverflow.com/questions/4421400/how-to-get-0-padded-binary-representation-of-an-integer-in-java) — devnull, Dec 12 '13 at 13:36

Konstantin Yovkov · Answer 1 · 2013-12-12T13:39:31.363

3

You can format the result from the Integer.toBinaryString(int i) method with the String.format(String pattern, Object ... args) method:

String binaryString = Integer.toBinaryString(84);
String format = String.format("%8s", binaryString).replace(' ', '0');

edited Dec 12 '13 at 13:39

answered Dec 12 '13 at 13:33

Konstantin Yovkov

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An integer is 32 bit, this will also show the first 8 0's whereas he only wants the last 8. – Jeroen Vannevel Dec 12 '13 at 13:34
Much better now, +1 :) – Jeroen Vannevel Dec 12 '13 at 13:36

How to convert decimal to binary and format it in a specific way?

1 Answers1