我已经搜索过，但不明白如何将以前的答案与我自己的代码结合起来。我有一个任务是为学校的“银行/奖学金”系统创建一个程序草案。这里我们需要创建很多不同的方法，这些方法应该被调用而不是直接进行更改。
问题是，我和其他一些人不断收到该主题中的错误消息，但我不知道如何解决它。如果有人能为我解释如何以及为什么要更改我的一种方法，我将非常感激，然后我假设我将能够自己重写所有其他方法。到目前为止，这是我的代码：
班级地址
public class Address {
public String street, zip, post;
public Address (String street, String zip, String post) {
this.street = street;
this.zip = zip;
this.post = post;
}
// these are setters (mutators)
public void setStreet (String street) {
this.street = street; }
public void setZip (String zip) {
this.zip = zip; }
public void setPost (String post) {
this.post = post; }
// these are getters
public String getStreet () {
return this.street; }
public String getZip () {
return zip; }
public String getPost () {
return post; }
// methods
//public Address Change(Address newAddress) {
//return newAddress;
//}
// output
public String toString() {
return (street + ", " + zip + ", "+ post); }
}
类客户
import java.text.DecimalFormat;
public class Customer {
DecimalFormat twoD = new DecimalFormat("0.00");
Address address = new Address("Vik ", "6393 ", "Tomrefjord");
public String name, campus, newCampus, newAddress;
public double loan, increase,decrease,regMaster;
public boolean finished;
public Customer (String name,Address address, String campus, double loan, boolean finished) {
this.name = name;
this.campus = campus;
this.loan = loan;
this.address = address;
this.finished = finished;
}
// these are setters
public void setName (String name) {
this.name = name; }
public void setCampus (String campus) {
this.campus = campus; }
public void setLoan (double loan) {
this.loan = loan; }
public void setFinished (boolean finished) {
this.finished = finished; }
// these are getters
public String getName () {
return name; }
public String getCampus () {
return campus; }
public double getLoan () {
return loan; }
// methods
public void RegMaster () {
this.loan = loan * 0.90;}
//public void changeAddress (Address newAddress) {
//Address.Change(newAddress); }
public double decreaseLoan (double currentBalance, double decrease) {
currentBalance = currentBalance - decrease;
return currentBalance; }
public double getNewLoan (double currentBalance, double newLoan) {
newLoan = currentBalance + newLoan;
return newLoan; }
public String getNewCampus (String newCampus) {
campus = newCampus;
return campus; }
public static boolean Ended () {
return true; }
// output
public String toString() {
return (name + "\t\n" + address + "\t\n" + campus + "\t\n" + twoD.format(loan) + "\t\n" + finished); }
}
类 TestCustomer
import java.util.Scanner;
public class TestCustomer {
public static void main (String[] args) {
String student, school, answer, street, zip, post;
double balance, master;
boolean finished = false;
double done = 0; //this is for the loop
Scanner scan = new Scanner(System.in);
// a new student receives a loan
System.out.println("Write your name");
student = scan.nextLine();
System.out.println("Enter your street name and number");
street = scan.nextLine();
System.out.println("What is your zip code?");
zip = scan.nextLine();
System.out.println("What is your post area?");
post = scan.nextLine();
System.out.println("Where do you study?");
school = scan.nextLine();
System.out.println("Input your current loan");
balance = scan.nextDouble();
Address residence = new Address(street, zip, post);
Customer customer = new Customer(student, residence, school, balance, finished);
while(done < 1) { //the variable done will have the value 0 until you are finished.
// change address
System.out.println("Do you wish to change your address? (yes/no)");
answer = scan.nextLine();
if (answer.equalsIgnoreCase("yes")) { //this made it case-insensitive, and now it is not skipping anymore...
System.out.println("Write your street name and house number");
street = scan.nextLine();
System.out.println("Write your zip code");
zip = scan.nextLine();
System.out.println("Write your post area");
post = scan.nextLine();
//Address newAddress = new Address(street, zip, post);
//residence = Customer.changeAddress(newAddress);
}
// increase the loan
System.out.println("Do you want to increase your loan? (yes/no)");
answer = scan.nextLine();
if (answer.equalsIgnoreCase("yes")) {
System.out.println("How much do you need?");
double increaseLoan = scan.nextDouble();
//customer.balance = getNewLoan(customer.balance, moreLoan);
}
// decrease the loan
System.out.println("Do you want to make a downpayment on your loan?");
answer = scan.nextLine();
if (answer.equalsIgnoreCase("yes")) {
System.out.println("How much do you intend to pay?");
double downpayment = scan.nextDouble();
//customer.balance = decreaseLoan(customer.balance, downpayment);
}
// change school
System.out.println("Do you study at the same school? (yes/no");
answer = scan.nextLine();
if (answer.equalsIgnoreCase("no")) {
System.out.println("Write the name of the new school");
school = scan.nextLine(); }
//school.getNewCampus(customer.campus);
// master check
System.out.println("Have you finished your master? (yes/no)");
answer = scan.nextLine();
if (answer.equalsIgnoreCase("yes")) {
customer.finished = Customer.Ended() ; //this will set finished to true, using the method like intended
//customer.balance = Customer.RegMaster(); // dont know how to invoke it... me neither -_-
}
System.out.println("Are you done? yes/no");
answer = scan.nextLine();
if (answer.equalsIgnoreCase("yes")) {
done = 1; } // this adds 1 to the variable done, thus ending the loop.
}
// output
System.out.println("");
System.out.println("The data we have so far is:");
System.out.println(customer);
}}
这是我所有的三个课程。一些功能被注释掉了，其他的只是不能正常工作（代码也有点乱，我昨天来回改变以试图让它工作）。任何帮助将不胜感激！:)