我正在编写在售票处工作的程序。有两个类，乘客和预订。但是当我创建乘客类时，代码的“if”部分不起作用，并给出了 nullpointerexception 的错误。“其他”部分正在工作。这是输出和错误：
run:
Choose option for processing;
1. Add a new passenger
2. Add a reservation for an existing Passenger
3. Display reservations
4. Cancel reservation
0. Quit
1
enter a name :
gokhan
adress :
nas
Number :
212
password :
123456
Exception in thread "main" java.lang.NullPointerException
at project1.testClass.main(testClass.java:47)
Java Result: 1
BUILD SUCCESSFUL (total time: 7 seconds) // what a succesful.
消息在此行中显示错误；
System.out.println("password : ");
password=input.nextLine();
if(password.equals("ffffff")){
System.out.println("Password should be six characters!\nYour password is: "+password);
break ;
}
else {
passenger[count]= new Passenger(name,adress,number,password); // this line
count++;
passenger[count].getAccID();
System.out.println("Password should be six characters!\nYour password is: "+password);
break ;
}
所以这是乘客舱：
public Passenger(String Name, String adress, String number, String password){
count++;
accID+=count;
AccountList[count]=accID;
this.Name=Name;
this.adress=adress;
this.number=number;
if(checkPw(password)==true){
this.password=password;
}
else {
this.password="ffffff";
}
private boolean checkPw(String password){
int length;
length = password.length();
if (length != 6) {
return false;
}
if (password.charAt(0)=='0'){
return false;
}
else {
for (int i = 0; i < password.length()-1 ;i++){
if((password.charAt(i))==(password.charAt(i+1))){
return false;
}
}
}
return true;
}