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)); 　　} 　　}