Laender und Staedte

Bundesland.java

/**
 *
 * @author max
 */
import java.util.ArrayList;

public class Bundesland extends Land {

  public Bundesland(String name) {
    super(name);
  }

  @Override
  public int compareTo(Land vergleichsLand) {
    return this.getName().compareTo(vergleichsLand.getName());
  }
}

DAO.java

/**
 *
 * @author max
 */
import java.util.*;

public class DAO {

  List<Land> laender = new ArrayList<Land>();

  /**
   * @param args
   */
  public DAO() {
    Land nrw = new Bundesland("Nordrhein-Westfalen");
    Land he = new Bundesland("Hessen");
    Stadt f = new Stadt("Frankfurt", false);
    Stadt wi = new Stadt("Wiesbaden", true);
    Stadt d = new Stadt("Duesseldorf", true);
    Stadt bi = new Stadt("Bielefeld", false);
    laender.add(nrw);
    laender.add(he);
  }

  public List<Land> getLaender() {

    return laender;
  }
  
  
}

GUI.java

/**
 *
 * @author max
 */
public class GUI extends javax.swing.JFrame {

  /**
   * Creates new form GUI
   */
  public GUI() {
    initComponents();
  }

  /**
   * This method is called from within the constructor to initialize the form.
   * WARNING: Do NOT modify this code. The content of this method is always
   * regenerated by the Form Editor.
   */
  @SuppressWarnings("unchecked")
  // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
  private void initComponents() {

    jButton1 = new javax.swing.JButton();
    jScrollPane2 = new javax.swing.JScrollPane();
    jTextArea1 = new javax.swing.JTextArea();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jButton1.setText("Städte anzeigen");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
        jButton1ActionPerformed(evt);
      }
    });

    jTextArea1.setColumns(20);
    jTextArea1.setRows(5);
    jScrollPane2.setViewportView(jTextArea1);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
        .addGap(33, 33, 33)
        .addComponent(jButton1)
        .addContainerGap(15, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addComponent(jButton1))
        .addContainerGap(176, Short.MAX_VALUE))
    );

    pack();
  }// </editor-fold>                        

  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
    java.util.List<Land> laender = this.dao.getContries();
    for (Land land: laender)
    {
      jTextArea1.append(land + "\n");
    }
  }                                        

  /**
   * @param args the command line arguments
   */
  public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
     */
    try {
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
        if ("Nimbus".equals(info.getName())) {
          javax.swing.UIManager.setLookAndFeel(info.getClassName());
          break;
        }
      }
    } catch (ClassNotFoundException ex) {
      java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
      java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
      java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
      java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        new GUI().setVisible(true);
      }
    });
  }
  
  private Transfer dao = new Transfer();
  // Variables declaration - do not modify                     
  private javax.swing.JButton jButton1;
  private javax.swing.JScrollPane jScrollPane2;
  private javax.swing.JTextArea jTextArea1;
  // End of variables declaration                   
}

JavaEditorGui.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

/**
  *
  * Beschreibung
  *
  * @version 1.0 vom 25.06.2013
  * @author 
  */

public class gui2 extends JFrame {
  // Anfang Attribute
  private JTextArea jTextArea1 = new JTextArea("");
    private JScrollPane jTextArea1ScrollPane = new JScrollPane(jTextArea1);
  private JButton jButton1 = new JButton();
  
  private DAO myDao = new DAO();
  // Ende Attribute
  
  public gui2(String title) { 
    // Frame-Initialisierung
    super(title);
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    int frameWidth = 300; 
    int frameHeight = 300;
    setSize(frameWidth, frameHeight);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    int x = (d.width - getSize().width) / 2;
    int y = (d.height - getSize().height) / 2;
    setLocation(x, y);
    setResizable(false);
    Container cp = getContentPane();
    cp.setLayout(null);
    // Anfang Komponenten
    
    jTextArea1ScrollPane.setBounds(32, 24, 200, 100);
    cp.add(jTextArea1ScrollPane);
    jButton1.setBounds(200, 168, 75, 25);
    jButton1.setText("jButton1");
    jButton1.setMargin(new Insets(2, 2, 2, 2));
    jButton1.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent evt) { 
        jButton1_ActionPerformed(evt);
      }
    });
    cp.add(jButton1);
    // Ende Komponenten
    
    setVisible(true);
  } // end of public gui2
  
  // Anfang Methoden
  public void jButton1_ActionPerformed(ActionEvent evt) {
    java.util.List<Land> laender = this.myDao.getLaender();
    for (Land land: laender)
    {
      jTextArea1.append(land + "\n");
    }
  } // end of jButton1_ActionPerformed
  
  // Ende Methoden
  
  public static void main(String[] args) {
    new gui2("gui2");
  } // end of main
  
} // end of class gui2

Land.java

/**
 *
 * @author max
 */
import java.util.*;

public abstract class Land implements java.lang.Comparable<Land> {

  private String name;
  private List<Stadt> staedteListe = new ArrayList<Stadt>();

  public Land(String name) {
    this.name = name;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public void setStadt(Stadt pStadt) {
    staedteListe.add(pStadt);
  }

  public Stadt getStadt(int pos) {
    return staedteListe.get(pos);
  }

  public Stadt getHauptstadt() {
    for (Stadt s : staedteListe) {
      if (s.isCapital()) {
        return s;
      }
    }
    return null;
  }

  @Override
  public String toString() {
    String output = "Name: " + this.getName();
    return output;
  }

  @Override
  public int compareTo(Land vergleichsLand) {
    return this.getName().compareTo(vergleichsLand.getName());
  }
}

Stadt.java

/**
 *
 * @author max
 */
import java.util.*;
public class Stadt implements Comparable<Stadt> {
private String name;
private boolean isCapital;
 
public String getName() {
return name;
}
 
public void setName(String name) {
this.name = name;
}
 
public boolean isCapital() {
return isCapital;
}
 
public void setCapital(boolean isCapital) {
this.isCapital = isCapital;
}
 
public Stadt(String name, boolean isCapital) {
this.name = name;
this.isCapital = isCapital;
}
public int compareTo(Stadt vergleichsStadt) {
return this.getName().compareTo(vergleichsStadt.getName());
}
 
}

Transfer.java

import java.util.List;

/**
 *
 * @author max
 */
public class Transfer {
  
  private DAO dao = new DAO();
  
  
  public List<Land> getContries() {
    return dao.getLaender();
  }
  
}