Re: method for a class constructor

This is what your code should look like

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Test extends JFrame { // Class names should begin with a
capital letter
  Alpha alpha = null; // Alpha is spelled with a 'ph', not 'f'
  Beta beta = null; // although not required, you should always
initialize all variables
  Gamma gamma = null; // instance names should begin with a lowercase
letter

  public Test () {
    alpha = new Alpha(this, null);
    beta = new Beta(this, null, null);
    gamma = new Gamma(this, null);

    alpha.setBeta(beta); // method names should begin with a lowercase
letter, but capitalize all other words.
    beta.setAlpha(alpha);
    beta.setGamma(gamma);
    gamma.setBeta(beta);
  }
}

class Alpha extends JPanel implements ActionListener {
  Test test = null;
  Beta beta = null;

  public Alpha(Test test, Beta beta) {
    this.test = test;
    this.beta = beta;
  }

  public void setBeta(Beta beta) {
    this.beta = beta;
  }

  public void actionPerformed(ActionEvent actionEvent) {
    // this method is here because this class implements
ActionListener
  }
}

class Beta extends JPanel implements ActionListener {
  Test test = null;
  Alpha alpha = null;
  Gamma gamma = null;

  public Beta(Test test, Alpha alpha, Gamma gamma) {
    this.gamma = gamma;
    this.test = test;
    this.alpha = alpha;
  }

  public void setAlpha(Alpha alpha) {
    this.alpha = alpha;
  }

  public void setGamma(Gamma gamma) {
    this.gamma = gamma;
  }

  public void actionPerformed(ActionEvent actionEvent) {
    // this method is here because this class implements
ActionListener
  }
}

class Gamma extends JPanel {
  Test test = null;
  Beta beta = null;

  public Gamma(Test test, Beta beta) {
    this.test = test;
    this.beta = beta;
  }
  public void setBeta(Beta beta) {
    this.beta = beta;
  }
}