public class NumericalDigitDataTest {

	public static void main(String[] args) {
		
		double doubleVal   = 1D; // double型リテラルを差し替えて確認してみる
		
		String prefixStr   = "0000000000000000000000000000000000000000000000000000000000000000"; //64桁の"0"
		long   d2l         = Double.doubleToLongBits(doubleVal);
		String l2bs        = prefixStr + Long.toBinaryString(d2l);
		int lastidx        = l2bs.length();
		
		System.out.printf("%s\n", l2bs.substring(lastidx-64, lastidx));
	}
}