java实现十进制转为二进制

时间：2010-10-17 来源：sulog

public class TenToTwo {

    public static String change(long DecNumber) {

        String BinNumber = "";
        for (int i = 64; i >= 0; i--) {
            if (DecNumber / (long) (Math.pow(2, i)) == 1) {
                BinNumber = BinNumber + "1";
                DecNumber = (long) (DecNumber - Math.pow(2, i));
            } else {
                if (!BinNumber.equals("")) {
                    BinNumber = BinNumber + "0";
                }
            }
        }
        return BinNumber;
    }

    /**
     * @param args
     */
    public static void main(String[] args) {

        long DecNumber = 456;
        System.out.println(TenToTwo.change(DecNumber));
    }
}

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