import java.util.regex.Matcher;import java.util.regex.Pattern;

public static void main(String[] args){        String str="我是${0},我来自${1},今年${2}岁";        String[] arr={"中国人","北京","22"};        str = fillStringByArgs(str, arr);        System.out.println(str);    }    private static String fillStringByArgs(String str,String[] arr){        Matcher m= Pattern.compile("\\$\\{(\\d)\\}").matcher(str);        while(m.find()){            str=str.replace(m.group(),arr[Integer.parseInt(m.group(1))]);        }        return str;    }