how to get the first two bytes from a string in java?

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Basic approach. Convert to byte array then get the characters you want then format as necesssay.

public class Main { 
    public static void main(String[] args) {        
        StringBuilder result = getBinary("hi there", 2);        
        System.out.println(result.toString());      
        }

    public static StringBuilder getBinary(String str, int numberOfCharactersWanted) {
        StringBuilder result = new StringBuilder();
        byte[] byt = str.getBytes();       
        for (int i = 0; i < numberOfCharactersWanted; i++) {        
            result.append(String.format("%8s", Integer.toBinaryString(byt[i])).replace(' ', '0')).append(' ');
        }
        return  result;
    }
}

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