Question

is it possible in java to have a class where it has EventHandlers for with different functions? for example button1 will log you in, while button2 will log you out, is this possible? Here’s the code I made it seems to be not working.

package event.handlers;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class TheHandler implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent logInEvent) {
        System.out.println("Button Login");
    }

    public void actionPerformed(ActionEvent cancelEvent) {
        System.out.println("Cancel Login");
    }
}

Answer 1

No. You can not have a class implement two methods with the same function signature. How would the compiler know which one to call for different events? The name you give to the arguments has no meaning to the compiler.

As an alternative, you can create multiple anonymous action listeners that simply forward the call to a method that does have a unique name if you want everything to be in the same class.

public class TheHandler {

    public TheHandler() {
        JButton login, cancel;

        //initialize code here

        login.addActionListener( new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent logInEvent) {
                loginPerformed(logInEvent);
            }
        });
        cancel.addActionListener( new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent cancelEvent) {
                cancelPerformed(cancelEvent);
            }
        });
    }

    public void loginPerformed(ActionEvent logInEvent) {
        System.out.println("Button Login");
    }

    public void cancelPerformed(ActionEvent cancelEvent) {
        System.out.println("Cancel Login");
    }
}