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我有这个作业的问题。该程序应首先运行registration()。如果用户年龄在13岁以下，它会发出警报，并应该返回registration()。如果用户超过13岁，它将运行displayProfile()并要求确认，如果答案是肯定的，它将通知它是成功的并且程序结束。如果答案是否定的，则应回到registration()并重复处理。如果答案无效，它应该继续提示有效答复。 问题出在registration()。在程序开始时，它工作正常，但是当我输入一个13岁以下的用户并返回到注册时，它跳过姓的输入部分，而是继续输出“First Name：” 。它在一个do while循环中，因为我想验证输入是否只有字符和空格。对于注册中的其他领域，一切正常。它只是在下一次运行时提示姓，它不起作用。算法有什么问题？在java中跳过扫描器输入内部do while循环
import java.util.Calendar;
import java.util.Scanner;
public class mainExercise{
static Scanner input = new Scanner(System.in);
static String lastName;
static String firstName;
static String email;
static String gender;
static String bday;
static int birthMonth;
static int birthDay;
static int birthYear;
static String confirmation;
static EmailValidator ev = new EmailValidator();
static Calendar cal = Calendar.getInstance();
public static void main(String[] args){
do{
do{
registration();
}while(validateAge(birthMonth, birthDay, birthYear) != 1);
displayProfile();
do{
confirmation = input.nextLine();
}while(confirm(confirmation)== -1);
if(confirm(confirmation)==0){
break;
}
}while(confirm(confirmation)== 1);
System.out.println("Thank you for registering, " + firstName);
}//end of main
static void registration(){
System.out.println("Welcome to Old School Facebook");
System.out.println("To register, please provide the following information");
System.out.print("Last Name: ");
do{
lastName = input.nextLine();
}while(validateName(lastName) != 1);
System.out.print("First Name: ");
do{
firstName = input.nextLine();
}while(validateName(firstName) != 1);
System.out.print("Email: ");
do{
email = input.nextLine();
}while(validateEmail(email) != 1);
System.out.print("Gender: ");
do{
gender = input.nextLine();
}while(validateGender(gender) != 1);
System.out.println("Enter birthdate");
do{
System.out.print("Month: ");
birthMonth = input.nextInt();
}while(validateBirthInput(birthMonth) != 1);
do{
System.out.print("Day: ");
birthDay = input.nextInt();
}while(validateBirthInput(birthDay) != 1);
do{
System.out.print("Year: ");
birthYear = input.nextInt();
}while(validateBirthInput(birthYear) != 1);
}
static int validateName(String s){
int valid = 1;
char name[] = s.toCharArray();
for(int i=0; i<name.length; i++){
if(Character.isLetter(name[i]) || Character.isWhitespace(name[i])){
valid = 1;
}else{
System.out.println("Invalid input");
valid = 0;
break;
}
}
return valid;
}
static int validateEmail(String s){
int valid = 1;
if(ev.validate(s)){
valid = 1;
}else{
System.out.println("Invalid email");
valid = 0;
}
return valid;
}
static int validateGender(String s){
int valid = 1;
if(s.toLowerCase().compareTo("m") == 0 || s.toLowerCase().compareTo("f") == 0){
valid = 1;
}else{
valid = 0;
}
return valid;
}
static int validateBirthInput(int x){
int valid = 1;
int birth;
try{
birth = x;
}catch(Exception e){
System.out.println("Enter numbers 1-12 for month, 1-31 for day, yyyy for year");
valid = 0;
}
return valid;
}
static int validateAge(int bm, int bd, int by){
int valid = 1;
int cm = cal.get(Calendar.MONTH);
int cd = cal.get(Calendar.DAY_OF_MONTH);
int cy = cal.get(Calendar.YEAR);
if((cy-by)<=13){
if(bm>=cm){
if(bd>cd){
valid = 0;
System.out.println("You must be at least 13 years old");
System.out.println();
}
}
}else{
valid = 1;
}
return valid;
}
static int confirm(String s){
int reply;
if(s.toLowerCase().compareTo("yes") == 0){
reply = 1;
}else if(s.toLowerCase().compareTo("no") >0){
reply = 0;
}else{
System.out.println("Invalid input. Type yes or no");
reply = -1;
}
return reply;
}
static void displayProfile(){
System.out.println();
System.out.println("Last Name: " + lastName);
System.out.println("First Name: " + firstName);
System.out.println("Email: " + email);
System.out.println("Gender: " + gender);
System.out.printf("Birthday: %d/%d/%d\n\n", birthMonth, birthDay, birthYear);
System.out.println("(yes or no): ");
}
}
我已经为您添加了作业标签。请将此标签添加到与作业相关的问题。 – pb2q 2012-08-08 05:28:50
@ pb2q感谢您添加标签 – mike26 2012-08-08 05:51:27