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我有這個作業的問題。該程序應首先運行registration()。如果用戶年齡在13歲以下，它會發出警報，並應該返回registration()。如果用戶超過13歲，它將運行displayProfile()並要求確認，如果答案是肯定的，它將通知它是成功的並且程序結束。如果答案是否定的，則應回到registration()並重復處理。如果答案無效，它應該繼續提示有效答覆。 問題出在registration()。在程序開始時，它工作正常，但是當我輸入一個13歲以下的用戶並返回到註冊時，它跳過姓的輸入部分，而是繼續輸出「First Name：」 。它在一個do while循環中，因爲我想驗證輸入是否只有字符和空格。對於註冊中的其他領域，一切正常。它只是在下一次運行時提示姓，它不起作用。算法有什麼問題？在java中跳過掃描器輸入內部do while循環
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): ");
}
}
我已經爲您添加了作業標籤。請將此標籤添加到與作業相關的問題。 – pb2q 2012-08-08 05:28:50
@ pb2q感謝您添加標籤 – mike26 2012-08-08 05:51:27