如何在我当前班级的其他课程中使用方法

Question

Greetings:I have a problem trying to use a method in my GUI class that i declared in another class.

This is the method in my Memba class that i'm trying to use:

public void newMember(String Memb_Name,String Memb_Surname,int age,int contact,String address,String username,String password){
    this.Memb_Name = Memb_Name;
    this.Memb_Surname = Memb_Surname;
    this.age = age;
    this.contact = contact;
    this.address = address;
    Memba.username = username;
    Memba.password = password;  
}

The method creates a new member.

In my GUI class >>Register class<< i'm trying to use the method and i can't get it to work.I have tried creating instances,like so:

Memba mmb = new Memba();
Memba mem= new newMember();
Memba mm = new Memba(s1,s2,s3,s4,s5,s6,s7);

The code already gets data that is entered in the textfields.

String s1 = nameFld.getText();
String s2 = surnameFld.getText();
int s3 = Integer.parseInt(ageFld.getText());
int s4 = Integer.parseInt(contactFld.getText());
String s5 = addressFld.getText();
String s6 = usernameFld.getText();
String s7 = passwordFld.getText();

Please help me resolve this problem.Regards.

Answer 1

You need to use a constructor for that, or a method returning an instance of Memba , instead of void .

Constructor

public Memba(String Memb_Name,String Memb_Surname,int age,int contact,String address,String username,String password) {

    this.Memb_Name = Memb_Name;
    this.Memb_Surname = Memb_Surname;
    this.age = age;
    this.contact = contact;
    this.address = address;
    this.username = username;
    this.password = password;  
}

Method delivering new instance (usually in factory patterns and such like)

public static Memba newInstance(String Memb_Name,String Memb_Surname,int age,int contact,String address,String username,String password) {

    // you will need to declare an empty constructor in your Memba class, 
    // _if_ you have already declared the constructor above, 
    // for the following line to compile
    Memba result = new Memba(); 
    result.Memb_Name = Memb_Name;
    result.Memb_Surname = Memb_Surname;
    result.age = age;
    result.contact = contact;
    result.address = address;
    result.username = username;
    result.password = password;  
    return result;
}

Notes

• My advice is to stick to conventions regarding variable names - ie Memb_Name should be refactored as name or memberName , etc.
• In the last assignments in the void method you expose in your question, you seem to assign static fields with the parameters of your method. I am assuming here they are in fact instance fields of Memba

Answer 2

There are two options, using your non-static void method you would need an instance to call newMember on. Like,

Memba mmb = new Memba();
mmb.newMember(s1,s2,s3,s4,s5,s6,s7);

Alternatively, change newMember to return a Memba (and be static ), like

public static Memba newMember(String Memb_Name,String Memb_Surname,
        int age,int contact,String address,String username,String password){
    Memba m = new Memba();
    m.Memb_Name = Memb_Name;
    m.Memb_Surname = Memb_Surname;
    m.age = age;
    m.contact = contact;
    m.address = address;
    m.username = username;
    m.password = password;
    return m;
}

Then you could use it like,

Memba mmb = Memba.newMember(s1,s2,s3,s4,s5,s6,s7);

Answer 3

i resolved my problem above by create a constructor that i was able to re use in my GUI.

public Memba(String MembsName,String MembsSurname,int ages,int contacts,String addresses,String usernames,String passwords){


        this.MembName = MembsName;
        this.MembSurname = MembsSurname;
        this.age = ages;
        this.contact = contacts;
        this.address = addresses;
        Memba.username = usernames;
        Memba.password = passwords;


    }

i re used it as

String s1 = nameFld.getText();
            String s2 = surnameFld.getText();
            int s3 = Integer.parseInt(ageFld.getText());
            int s4 = Integer.parseInt(contactFld.getText());
            String s5 = addressFld.getText();
            String s6 = usernameFld.getText();
            String s7 = passwordFld.getText();

            new Memba(s1,s2,s3,s4,s5,s6,s7);