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


import java.util.Iterator;


public class Tutorial11 extends JFrame implements ActionListener{
  JButton bnPrev = new JButton("Prev");
  JButton bnShow = new JButton("Show");
  JButton bnNext = new JButton("Next");
  
  JTextArea editor = new JTextArea();
   // Konstruktor
  public Tutorial11() {
    this.setSize( 400, 400);
    setLocation(400,10);
    setTitle( "11. Tutorial");
    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    setGUI();
    init();
  }

  /**
   * Aufbau der GUI-Elemente.
   * Einfuegen der "desktopPane" in CENTER.
   */
  public void setGUI() {
      // BorderLayout setzen
    this.getContentPane().setLayout( new BorderLayout() );
   JPanel panelBn = new JPanel();
   panelBn.setLayout( new FlowLayout(FlowLayout.RIGHT));
      panelBn.add(bnPrev);
      panelBn.add(bnShow);
      panelBn.add(bnNext);
      this.getContentPane().add(panelBn,BorderLayout.NORTH);
      setFonts(getContentPane(), 18);
      bnPrev.addActionListener(this);
      bnShow.addActionListener(this);      
      bnNext.addActionListener(this);      

      this.getContentPane().add( new JScrollPane(editor) ,BorderLayout.CENTER);
      editor.setFont(new Font("Arial", Font.BOLD, 18));
  }

  
  private void setFonts(Container cont, int size) {
      for (int i = 0; i < cont.getComponentCount(); i++) {
         Component c = cont.getComponent(i);
         if (c instanceof JPanel)
            setFonts((JPanel) c, size);
         else
            c.setFont(new Font("Arial", Font.BOLD, size));
      }
   }
  
   public void actionPerformed(ActionEvent e) {
      if (e.getSource() == bnPrev) {
         bnPrev_click();
      }
      if (e.getSource() == bnShow) {
         bnShow_click();
      }
      if (e.getSource() == bnNext) {
         bnNext_click();
      }
   }


   private void   init() {
     editor.setText("2. Test:\n");    
/*
     new Student("Meier",11111);
     new Student("Müller",11112);
     new Student("Schmidt",11113);
     new Student("Schulze",11114);
     new Student("Gumm",11115);
     new Student("Dijkstra",11116);
     new Student("Brandt",11117);
     new Student("Hohmann",11118);
     new Student("Hundertwasser",11119);
     new Student("Bloch",11121);
*/
     bnShow_click();
   }

   private void   bnPrev_click() {
   }

   private void   bnShow_click() {
   }


   private void   bnNext_click() {
     /*
     if(iterator.hasNext()) {
       editor.append("  "+iterator.next()+"\n");
     }
     */
   }

   public static void main(String[] args) {
    Tutorial11 frame = new Tutorial11();
    frame.setVisible(true);
  }
}