boutils.java

《基于Eclipse的开源框架技术与实战》[第5章]随书源码

package com.free.struts.storefront.businessobjects;

/**
 * <p>Title: Eclipse Plugin Development</p>
 * <p>Description: Free download</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: Free</p>
 * @author gan.shu.man
 * @version 1.0
 */

public class BOUtils {

	public static Double getRoundedDouble(double unroundedValue) {
		// Get the integer portion of the value
		double intPortion = Math.floor(unroundedValue);

		// Get the unrounded decimal portion
		double unroundedDecimalPortion = (unroundedValue - intPortion);

		/* ALERT - This next code interferes with I18N. We eventually need   */
		/*         to change this not assume only round to 2 decimal places. */

		/* Multiply the decimal places by 100, which shitfs the decimal point
		/* two places to the left. Then round it so that we get a round to
		/* two decimal places. For example, if we started with 17.655 and stripped
		/* off the int portion, which left .655. After we shift, we are left with
		/* 65.5. Then a round will gives us 66. We can then put it all back
		/* together */
		double roundedDecimalPortion =
			Math.round(unroundedDecimalPortion * 100);

		// Shift the decimal point back two places to the right
		roundedDecimalPortion = roundedDecimalPortion / 100;

		// Add the int portion and decimal portions back together
		double total = intPortion + roundedDecimalPortion;

		return new Double(total);
	}
}