FormateUtil 工具类，Double的精度确定

package com.my.util;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.List;


public class FormateUtil {
	private static FormateUtil instance;	
	public static final NumberFormat MONEY_FORMATE = new DecimalFormat("##0.0000");
	
	public static final NumberFormat MONEY_FORMATE_LONG = new DecimalFormat("##0");
	
	public static FormateUtil getInstance(){
		if(instance==null){
			instance = new FormateUtil();
		}
		return instance;
	}	
	
	public String formateDouble(Double value){
		return this.formateDouble(value, "");
	}
	
	public String formateDouble(Double value,String defaultValue){
		if(value==null){
			return defaultValue;
		}else{
			return MONEY_FORMATE.format(value);
		}
	}
	
	public String formateDouble(Double value,String defaultValue,NumberFormat format){
		if(value==null){
			return defaultValue;
		}else{
			return format.format(value);
		}
	}
	
}