Java中的GUI接口类？

Question

My question is about using interface class with graphical user interface in java.

Now i have interface class which have methods like this:

public interface management
{
    public void loginActionPerformed(java.awt.event.ActionEvent evt);
}

then i create a class that implements the interface but this class is written with gui design and has a button that will implement the method login

the problem: the button method is private and cannot be converted to public because iam using the drag and drop to make the design.

how to fix this problem or how to use interface class with gui design?

code of the class that has the design:

public class employee extends javax.swing.JFrame implements management
{
private void loginActionPerformed(java.awt.event.ActionEvent evt) {
   // implementation 
   }
}

Answer 1

Java doesn't allow private methods in interfaces .

A possible workaround solution, is to use another method name in the interface and delegate in the implementation:

public class Employee extends javax.swing.JFrame implements Management
{
   @Override
   public void myLoginActionPerformed(java.awt.event.ActionEvent evt) {
       loginActionPerformed(evt);
   }

   // @javax.annotation.Generated 
   private void loginActionPerformed(java.awt.event.ActionEvent evt) {
       // implementation 
   }
}

with

public interface Management
{
    void myLoginActionPerformed(java.awt.event.ActionEvent evt);
}

Answer 2

Finally i found the solution for my question:

Interface class like this:

public interface Management
{
     public void login(Account a); // object from a class instead of gui frame.
}

The class implemented the interface:

public class Employee extends javax.swing.JFrame implements Management
{
    private void loginActionPerformed(java.awt.event.ActionEvent evt) {
    Account a = new Account();
    login(a); 
    // button method that should clicked on.
   }
}

 public void login(Account a)
 {
     // implementation of what button should do when clicked on.
 }

Special thanks to @RC :)