java 数字格式化 NumberFormat类的使用

实例1：默认数据格式化

package com.meixin.classuse;import java.text.NumberFormat;public class DefaultNumberFormat{public static void defaultNumberFormat(){int i = 123456;double x = 882323.23523;double p = 0.528;double c = 52.83;System.out.println("--------------------------------------");//实例化NumberFormat需要使用NumberFormat的getInstance()方法NumberFormat nf = NumberFormat.getInstance();//默认格式化int类型，结果已分节//结果：Integer 123456 is displayed as 123,456System.out.println("Integer " + i + " is displayed as " + nf.format(i));//默认格式化double类型，结果保留三位小数，已分节//结果：Double 882323.23523 is displayed as 882,323.235System.out.println("Double " + x + " is displayed as " + nf.format(x));System.out.println("--------------------------------------");//实例化为整型数据格式化NumberFormat nfInt = NumberFormat.getIntegerInstance();//默认，结果：Integer 123456 is displayed as 123,456System.out.println("Integer " + i + " is displayed as "+ nfInt.format(i));System.out.println("--------------------------------------");//实例化为数据格式化NumberFormat nfNumber = NumberFormat.getNumberInstance();//结果：Double 882323.23523 is displayed as 882,323.235System.out.println("Double " + x + " is displayed as "+ nfNumber.format(x));System.out.println("--------------------------------------");//百分数格式化NumberFormat nfPercent = NumberFormat.getPercentInstance();//结果已四舍五入//结果：Percent 0.528 is displayed as 53%System.out.println("Percent " + p + " is displayed as "+ nfPercent.format(p));System.out.println("--------------------------------------");//货币型格式化NumberFormat nfCurrency = NumberFormat.getCurrencyInstance();//结果：Currency 52.83 is displayed as ￥52.83System.out.println("Currency " + c + " is displayed as "+ nfCurrency.format(c));}public static void main(String[] args){defaultNumberFormat();System.out.println();}}

 

实例2：自定义数据格式化

package com.meixin.classuse;import java.text.DecimalFormat;public class CustomNumberFormat{public static void customNumberFormat(){double x = 100000.0 / 3;// default output is 33333.333333333336System.out.println("default output is " + x);// 33,333.33System.out.println(new DecimalFormat("###,###.##").format(x));// 33333.33System.out.println(new DecimalFormat("####.##").format(x));// 33333.33System.out.println(new DecimalFormat("####.00").format(x));// 33333.33System.out.println(new DecimalFormat("####.0#").format(x));// 0033333.33System.out.println(new DecimalFormat("0000000.##").format(x));// $33,333.33System.out.println(new DecimalFormat("$###,###.##").format(x));// 3.333E4System.out.println(new DecimalFormat("0.###E0").format(x));// 3333333.33%System.out.println(new DecimalFormat("00.##%").format(x));System.out.println("--------------------------------------");double y = 23232323.0012;//default output is 2.32323230012E7System.out.println("default output is " + y);//23,232,323System.out.println(new DecimalFormat("###,###.##").format(y));//23232323System.out.println(new DecimalFormat("####.##").format(y));//23232323.00System.out.println(new DecimalFormat("####.00").format(y));//23232323.0System.out.println(new DecimalFormat("####.0#").format(y));//0023232323System.out.println(new DecimalFormat("0000000000.##").format(y));//$23,232,323System.out.println(new DecimalFormat("$###,###.##").format(y));//2.323E7System.out.println(new DecimalFormat("0.###E0").format(y));//2323232300.12%System.out.println(new DecimalFormat("00.##%").format(y));}public static void main(String[] args){customNumberFormat();System.out.println();}}