importjava.util.Scanner;publicclassAgeValidator{publicstaticvoidmain(String[]args){// 从用户输入中获取年龄字符串Scannerscanner=newScanner(System.in);System.out.print("请输入年龄:");StringageStr=scanner.nextLine();// 判断年龄字符串是否合法if(NumberChecker.isNumber(ageStr)){doubleage=Double.parseDoub...