import java.math.BigDecimal;

import java.util.Scanner;

/**

 * Created by Administrator on 2016/9/20.

 */

public class BigDecimalGetNumbers {

    public static void main(String args[]) {

        Scanner in = new Scanner(System.in);

        double dInput = in.nextDouble();

        long longPart = (long) dInput;

        BigDecimal bigDecimal = new BigDecimal(Double.toString(dInput));

        BigDecimal bigDecimalLongPart = new BigDecimal(Double.toString(longPart));

        double dPoint = bigDecimal.subtract(bigDecimalLongPart).doubleValue();

        System.out.println("整数部分为:" + longPart + "\n" + "小数部分为: " + dPoint);

    }

}

1.234567E4

整数部分为:12345

小数部分为: 0.67

Process finished with exit code 0