採樣運行的語句:不打印出所有書面
License Validator
Enter a last name: ab bA
Enter a last name: ab bA
Enter year of birth: a12w
Enter year of birth: 1979
Enter driver's license number: A123-4567-9801-23
Consistent
我的代碼是: 進口java.util.Scanner的; 公共五級{
private static String getLastName(Scanner sc)
{
System.out.println("License Validator");
System.out.print("enter last name: ab bA");
String lastname=sc.nextLine().trim();
if(lastname.length()==0)
lastname=getLastName(sc);
int numspaces=0;
for(int i=0;i<lastname.length();i++)
{
if(Character.isSpace(lastname.charAt(i)))
{
numspaces++;
}
else if(!Character.isLetter(lastname.charAt(i)))
{
lastname=getLastName(sc);
}
if(numspaces>2)
{
lastname=getLastName(sc);
}
}
return lastname;
}
private static boolean Character(char charAt) {
return false;
}
public static String getYearOfBirth(Scanner sc)
{
System.out.print("Enter year of birth: 1979");
String year=sc.nextLine().trim();
if(year.length()==0)
year=getYearOfBirth(sc);
try
{
int yearint=Integer.parseInt(year);
if(yearint<1900||yearint>1999)
{
year=getYearOfBirth(sc);
}
}
catch(NumberFormatException e)
{
year=getYearOfBirth(sc);
}
return year;
}
public static String getlicensenumber(Scanner sc)
{
System.out.print("Enter driver's license number:");
String licencenum=sc.nextLine().trim();
if(licencenum.length()!=17||licencenum.length()==0)
{
licencenum=getlicensenumber(sc);
}
String arr[]=licencenum.split("-");
if(arr.length!=4)
{
licencenum=getlicensenumber(sc);
}
if(Character.isLetter(arr[0].charAt(0)))
{
if(Character.isLowerCase(arr[0].charAt(0)))
{
licencenum=getlicensenumber(sc);
}
}
else
{
licencenum=getlicensenumber(sc);
}
try
{
Long.parseLong(arr[0].substring(1)+arr[1]+arr[2]+arr[3]);
}
catch(NumberFormatException e)
{
licencenum=getlicensenumber(sc);
}
return licencenum;
}
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
String lastname=getLastName(sc);
String yearOfBirth=getYearOfBirth(sc);
String licensenumber=getlicensenumber(sc);
if(licensenumber.substring(0, 1).equalsIgnoreCase(lastname.substring(0, 1))&&(licensenumber.substring(8, 9)+licensenumber.substring(10, 11)).equals(yearOfBirth.substring(2)))
{
System.out.println("Consistent");
}
else
System.out.println("fraudulent");
}
}
它只會輸出:
License Validator
Enter last name:
我很困惑,爲什麼其他字符串方法不輸出?此外,lastName的if語句已將「isSpace」刪除並表示它已折舊。
你提供了什麼樣的輸入,你爲什麼要用遞歸執行這個驗證的一部分? – PakkuDon