字符串轉換為二進制

public class StringToBinay
{

    public static void main(String[] args)
    {


        String str="ABC12345";

        System.out.println(toBinary(str));
    }

    public static String toBinary(String str)
    {

        char[] strChar = str.toCharArray();

        int [] a=new int[str.length()];
        for(int i=0;i<str.length();i++)
        {
            a[i]=strChar[i];
        }

        String result = "";
        for(int i = 0; i < strChar.length; i++)
        {
            if(Integer.toBinaryString(a[i]).length()<7)
            {
                result+="0"+Integer.toBinaryString(a[i])+" ";
            }
            else
            {
                result += Integer.toBinaryString(a[i]) + " ";
            }
        }
        return result;
    }
}