Convert String / char into specified-digit binary string and vice versa in java

Question

I'm trying to convert a string (or a single char) into given number of digits binary string in java. Assume that given number is 5, so a string "zx~q" becomes 01101, 10110, 11011, 10011 (I' ve made up the binaries). However, I need to revert these binaries into "abcd" again. If given number changes, the digits (so the binaries) will change.

Anyone has an idea?

PS: Integer.toBinaryString() changes into an 8-digit binary array.

This might be helpful: stackoverflow.com/questions/4211705/binary-to-text-in-java — SpaceCowboy
– SpaceCowboy, Commented Mar 17, 2013 at 18:44
@TGMCians given string might not come up with hexadecimal radix, it might contain any ascii character — tugcem
– tugcem, Commented Mar 17, 2013 at 19:09
Actually, this post answers half of my problem. But I couldnt decode the generated binary into desired char. — tugcem
– tugcem, Commented Mar 17, 2013 at 21:18

SirPentor · Accepted Answer · 2013-03-17 18:45:41Z

2

Looks like Integer.toString(int i, int radix) and Integer.parseInt(string s, int radix) would do the trick.

answered Mar 17, 2013 at 18:45

SirPentor

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Ajay S · Accepted Answer · 2013-03-17 19:11:52Z

0

You can achieve like this.

To convert abcd to 1010101111001101,

class Demo {
    public static void main(String args[]) {  
        String str = "abcd";
        for(int i = 0; i < str.length(); i++) {
            int number = Integer.parseInt(String.valueOf(str.charAt(i)), 16);
            String binary = Integer.toBinaryString(number);
            System.out.print(binary);
        }
    }
}

To convert the 1010101111001101 to abcd

String str = "1010101111001101";
String binary = Long.toHexString(Long.parseLong(str,2));
System.out.print(binary);

edited Mar 17, 2013 at 19:11

answered Mar 17, 2013 at 18:49

Ajay S

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2 Comments

tugcem Over a year ago

@SirPentor, Integer.parseInt takes radix for second parameter. However, the desired string to convert to given-digited binary might be like "zz~java". "abcd" wasnt a good example.

user2387900 Over a year ago

What if there is a space in between ?

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