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PO(non-static method Change(String,String,String) cannot be referenced from a static context
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copied!<p>I've searched, but didn't understand how to incorporate previous answers with my own code. I have an assigment to create a draft of a program for the schools "bank/scholarship"-system. Here we need to create a lot of different methods, that should be called instead of just doing the change directly.</p> <p>The thing is, I keep getting the error-message in the topic along with a few others, and I don't know how to fix it. I would really appreciate if someone could explain for me how and why to change one of my methods, then I assume I will be able to rewrite all the others myself. Here is my code so far:</p> <p>class Address</p> <pre><code>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); } } </code></pre> <p>class Customer</p> <pre><code>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); } } </code></pre> <p>class TestCustomer</p> <pre><code>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); }} </code></pre> <p>Here are all three of my classes. Some of the functions are commented away, others are just not working properly (the code is also a little extra messy, I was changing back and forth to try to get it working yesterday). Any help will be appreciated! :)</p>

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