numberutil.java

因为许多人出去吃饭都一个人付帐

package cn.com.sdcncsi.lunch.utils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class NumberUtil {

	private static Log logger = LogFactory.getLog(NumberUtil.class.getName());
	private static final int PRECISION = 1;
	
	public static Double reducePrecision(Double source){
		return reducePrecision(source, PRECISION);
		
	}
	
	public static Double reducePrecision(Double source, int precision2) {
		// TODO Auto-generated method stub
		String str = String.valueOf(source);
		Double dest = new Double(str.substring(0,str.indexOf(".")+precision2+1));
		return dest;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		logger.debug(NumberUtil.reducePrecision(new Double("22.200000000000003")));
	}

}