bluej-ueberlauf-demo/Zaehlen.java

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

/**
 *
 * Applet zum ZahlUeberlauf
 *
 * @version 1.0 from 11.10.2016
 * @author Tom Schaller, Dirk Zechnall
 */

public class Zaehlen extends JFrame {
    // Anfang Attribute
    private JButton jButton1 = new JButton();
    private JButton jButton2 = new JButton();
    private JLabel jLabel1 = new JLabel();
    private JLabel jLabel2 = new JLabel();
    private JLabel jLabel3 = new JLabel();
    private JLabel jLabel4 = new JLabel();
    private JLabel jLabel5 = new JLabel();
    private JLabel jLabel6 = new JLabel();
    private JButton jButton3 = new JButton();
    private JButton jButton4 = new JButton();
    private JButton jButton5 = new JButton();
    private JButton jButton6 = new JButton();
    private JLabel jLabel7 = new JLabel();
    private JLabel jLabel8 = new JLabel();
    private JButton jButton7 = new JButton();
    private JButton jButton8 = new JButton();
    
    private byte b = 120;
    private short s = 32760;
    private int i = 2147483647;
    private long l = 9223372036854775807L;
    // Ende Attribute

    public Zaehlen () {
        super ("Zaehlen mit elementaren Datentypen");
        int frameWidth = 494; 
        int frameHeight = 177;
        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);
        Container cp = getContentPane();
        cp.setLayout(null);
        // Anfang Komponenten
        jButton1.setBounds(288, 40, 75, 25);
        jButton1.setText("+1");
        jButton1.setMargin(new Insets(2, 2, 2, 2));
        jButton1.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton1_ActionPerformed(evt);
                }
            });
        cp.add(jButton1);
        jButton2.setBounds(288, 72, 75, 25);
        jButton2.setText("+1");
        jButton2.setMargin(new Insets(2, 2, 2, 2));
        jButton2.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton2_ActionPerformed(evt);
                }
            });
        cp.add(jButton2);
        jLabel1.setBounds(8, 40, 78, 20);
        jLabel1.setText("short");
        cp.add(jLabel1);
        jLabel2.setBounds(8, 72, 54, 20);
        jLabel2.setText("int");
        cp.add(jLabel2);
        jLabel3.setBounds(8, 104, 78, 20);
        jLabel3.setText("long");
        cp.add(jLabel3);
        jLabel4.setBounds(96, 40, 110, 20);
        jLabel4.setText("240");
        cp.add(jLabel4);
        jLabel5.setBounds(96, 72, 110, 20);
        jLabel5.setText("text");
        cp.add(jLabel5);
        jLabel6.setBounds(96, 104, 166, 20);
        jLabel6.setText("text");
        cp.add(jLabel6);
        jButton3.setBounds(288, 104, 75, 25);
        jButton3.setText("+1");
        jButton3.setMargin(new Insets(2, 2, 2, 2));
        jButton3.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton3_ActionPerformed(evt);
                }
            });
        cp.add(jButton3);
        jButton4.setBounds(392, 40, 75, 25);
        jButton4.setText("-1");
        jButton4.setMargin(new Insets(2, 2, 2, 2));
        jButton4.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton4_ActionPerformed(evt);
                }
            });
        cp.add(jButton4);
        jButton5.setBounds(392, 72, 75, 25);
        jButton5.setText("-1");
        jButton5.setMargin(new Insets(2, 2, 2, 2));
        jButton5.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton5_ActionPerformed(evt);
                }
            });
        cp.add(jButton5);
        jButton6.setBounds(392, 104, 75, 25);
        jButton6.setText("-1");
        jButton6.setMargin(new Insets(2, 2, 2, 2));
        jButton6.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton6_ActionPerformed(evt);
                }
            });
        cp.add(jButton6);
        jLabel7.setBounds(8, 8, 78, 20);
        jLabel7.setText("byte");
        cp.add(jLabel7);
        jLabel8.setBounds(96, 8, 110, 20);
        jLabel8.setText("text");
        cp.add(jLabel8);
        jButton7.setBounds(288, 8, 75, 25);
        jButton7.setText("+1");
        jButton7.setMargin(new Insets(2, 2, 2, 2));
        jButton7.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton7_ActionPerformed(evt);
                }
            });
        cp.add(jButton7);
        jButton8.setBounds(392, 8, 75, 25);
        jButton8.setText("-1");
        jButton8.setMargin(new Insets(2, 2, 2, 2));
        jButton8.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent evt) { 
                    jButton8_ActionPerformed(evt);
                }
            });
        cp.add(jButton8);
        jLabel4.setText(""+s);
        jLabel5.setText(""+i);
        jLabel6.setText(""+l);
        jLabel8.setText(""+b);

        // Ende Komponenten
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setResizable(false);
        setVisible(true);
    }

    // Anfang Methoden
    public void jButton1_ActionPerformed(ActionEvent evt) {
        s++;
        jLabel4.setText(""+s);
    } // end of jButton1_ActionPerformed

    public void jButton2_ActionPerformed(ActionEvent evt) {
        i++;
        jLabel5.setText(""+i); 
    } // end of jButton2_ActionPerformed

    public void jButton3_ActionPerformed(ActionEvent evt) {
        l++;
        jLabel6.setText(""+l);
    } // end of jButton3_ActionPerformed

    public void jButton4_ActionPerformed(ActionEvent evt) {
        s--;
        jLabel4.setText(""+s);
    } // end of jButton4_ActionPerformed

    public void jButton5_ActionPerformed(ActionEvent evt) {
        i--;
        jLabel5.setText(""+i);
    } // end of jButton5_ActionPerformed

    public void jButton6_ActionPerformed(ActionEvent evt) {
        l--;
        jLabel6.setText(""+l);
    } // end of jButton6_ActionPerformed

    public void jButton7_ActionPerformed(ActionEvent evt) {
        b++;
        jLabel8.setText(""+b);
    } // end of jButton7_ActionPerformed

    public void jButton8_ActionPerformed(ActionEvent evt) {
        b--;
        jLabel8.setText(""+b);
    } // end of jButton8_ActionPerformed

    // Ende Methoden

    public static void main(String[] args) {
        new Zaehlen();
    }
}