MessageFormat的用法,java动态替换String字符串中的占位符

import java.text.MessageFormat;
import java.util.GregorianCalendar;
import java.util.Locale;public class Test3
{
public static void main(String[] args) throws Exception
{
String pattern1 = "{0},你好!你于 {1} 存入 {2}元";
String pattern2 = "At {1,time,short} on {1,date,long},{0} paid {2,number,currency}"; //1.0E3 科学计数法 即 1.0*10^3 E3表示10的三次方
Object[] params = {"hoonick",new GregorianCalendar().getTime(),1.0E3}; //使用默认的本地化对象格式化字符串
String format = MessageFormat.format(pattern1, params);
System.out.println(format); //使用指定的本地化对象格式化字符串
MessageFormat mf = new MessageFormat(pattern2, Locale.US);
String format2 = mf.format(params);
System.out.println(format2);
}}