Calculator - Java Swing - Netbeans - Internet & Web Programming Lab

Calculator Implementation in Java Swing - NetBeans

Design:

Sourcecode (NetBeans):

/*
 * NewFrame.java
 *
 * Created on Nov 20, 2011, 4:29:49 AM
 */
package swing;

/**
 *
 * author nn
 */
public class swingCalc extends javax.swing.JFrame {
    String stringtemp;
    float resltemp;
    boolean opflag,startflag,decimalflag;
    int chooseop;
    /** Creates new form swingCalc */
    public swingCalc() {
        super("Calculator");
        initComponents();
        startflag=true;
    }

    /** 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">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jTextField1 = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jPanel2 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton11 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();
        jButton6 = new javax.swing.JButton();
        jButton12 = new javax.swing.JButton();
        jButton7 = new javax.swing.JButton();
        jButton8 = new javax.swing.JButton();
        jButton9 = new javax.swing.JButton();
        jButton13 = new javax.swing.JButton();
        jButton16 = new javax.swing.JButton();
        jButton10 = new javax.swing.JButton();
        jButton17 = new javax.swing.JButton();
        jButton14 = new javax.swing.JButton();
        jButton15 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setBackground(new java.awt.Color(36, 119, 125));

        jPanel1.setOpaque(false);

        jTextField1.setEditable(false);
        jTextField1.setFont(new java.awt.Font("DejaVu Sans", 1, 18));
        jTextField1.setHorizontalAlignment(javax.swing.JTextField.RIGHT);

        jLabel1.setFont(new java.awt.Font("URW Gothic L", 1, 24));
        jLabel1.setForeground(new java.awt.Color(52, 169, 236));
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("www.2k8618.blogspot.com");

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(32, 32, 32)
                        .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 328, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jLabel1)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        jPanel2.setLayout(new java.awt.GridLayout(4, 4));

        jButton1.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton1.setText("1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton1);

        jButton2.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton2.setText("2");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton2);

        jButton3.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton3.setText("3");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton3);

        jButton11.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18)); // NOI18N
        jButton11.setText("+");
        jButton11.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton11ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton11);

        jButton4.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton4.setText("4");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton4);

        jButton5.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton5.setText("5");
        jButton5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton5ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton5);

        jButton6.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton6.setText("6");
        jButton6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton6ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton6);

        jButton12.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton12.setText("-");
        jButton12.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton12ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton12);

        jButton7.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton7.setText("7");
        jButton7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton7ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton7);

        jButton8.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton8.setText("8");
        jButton8.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton8ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton8);

        jButton9.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton9.setText("9");
        jButton9.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton9ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton9);

        jButton13.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton13.setText("*");
        jButton13.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton13ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton13);

        jButton16.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton16.setText("Clear");
        jButton16.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton16ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton16);

        jButton10.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton10.setText("0");
        jButton10.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton10ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton10);

        jButton17.setFont(new java.awt.Font("DejaVu Sans", 1, 18)); // NOI18N
        jButton17.setText(".");
        jButton17.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton17ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton17);

        jButton14.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton14.setText("/");
        jButton14.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton14ActionPerformed(evt);
            }
        });
        jPanel2.add(jButton14);

        jButton15.setFont(new java.awt.Font("DejaVu Sans Condensed", 1, 18));
        jButton15.setText("=");
        jButton15.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton15ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGroup(layout.createSequentialGroup()
                .addGap(12, 12, 12)
                .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
                .addGap(12, 12, 12))
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jButton15, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 185, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jButton15, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
// TODO add your handling code here:
    if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"1");
    opflag=false;
}//GEN-LAST:event_jButton1ActionPerformed

private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton11ActionPerformed
// TODO add your handling code here:
    resltemp += Float.parseFloat(jTextField1.getText());
    jTextField1.setText(Float.toString(resltemp));
    chooseop=1;
    opflag=true;
    startflag=false;
    decimalflag=false;
}//GEN-LAST:event_jButton11ActionPerformed

private void jButton15ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton15ActionPerformed
// TODO add your handling code here:
    if(opflag||startflag) 
        jTextField1.setText("error");
    else{
        switch(chooseop)
        {
            case 1:
                jTextField1.setText(Float.toString(resltemp += Float.parseFloat(jTextField1.getText())));
                break;
            case 2:
                jTextField1.setText(Float.toString(resltemp -= Float.parseFloat(jTextField1.getText())));
                break;
            case 3:
                jTextField1.setText(Float.toString(resltemp *= Float.parseFloat(jTextField1.getText())));
                break;
            case 4:
                jTextField1.setText(Float.toString(resltemp /= Float.parseFloat(jTextField1.getText())));
                break;                
        }   
    
  
    }
    resltemp=0;
    opflag=true;
    startflag=true;
    decimalflag=false;
}//GEN-LAST:event_jButton15ActionPerformed

private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton12ActionPerformed
// TODO add your handling code here:
    if(startflag)
      resltemp = Float.parseFloat(jTextField1.getText());
    else
      resltemp -= Float.parseFloat(jTextField1.getText());  
    jTextField1.setText(Float.toString(resltemp));
    opflag=true;
    chooseop=2;
    startflag=false;
    decimalflag=false;
}//GEN-LAST:event_jButton12ActionPerformed

private void jButton16ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton16ActionPerformed
// TODO add your handling code here:
    jTextField1.setText(null);
    resltemp=0;
    startflag=true;
    decimalflag=false;
    
}//GEN-LAST:event_jButton16ActionPerformed

private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton13ActionPerformed
// TODO add your handling code here:
   if(startflag)
      resltemp = Float.parseFloat(jTextField1.getText());
   else
      resltemp *= Float.parseFloat(jTextField1.getText());
    jTextField1.setText(Float.toString(resltemp));
    chooseop=3;
    opflag=true;
    startflag=false;
    decimalflag=false;
}//GEN-LAST:event_jButton13ActionPerformed

private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton14ActionPerformed
// TODO add your handling code here:
      if(startflag)
      resltemp = Float.parseFloat(jTextField1.getText());
    else
        resltemp /= Float.parseFloat(jTextField1.getText());
    
    jTextField1.setText(Float.toString(resltemp));
    chooseop=4;
    opflag=true;
   startflag=false;
   decimalflag=false;
}//GEN-LAST:event_jButton14ActionPerformed

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"2");
    opflag=false;
}//GEN-LAST:event_jButton2ActionPerformed

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"3");
    opflag=false;
}//GEN-LAST:event_jButton3ActionPerformed

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton4ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"4");
  opflag=false;
}//GEN-LAST:event_jButton4ActionPerformed

private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton5ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"5");
  opflag=false;
}//GEN-LAST:event_jButton5ActionPerformed

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"6");
  opflag=false;
}//GEN-LAST:event_jButton6ActionPerformed

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton7ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"7");
    opflag=false;
}//GEN-LAST:event_jButton7ActionPerformed

private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton8ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"8");
    opflag=false;
}//GEN-LAST:event_jButton8ActionPerformed

private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton9ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"9");
    opflag=false;
}//GEN-LAST:event_jButton9ActionPerformed

private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton10ActionPerformed
// TODO add your handling code here:
     if(opflag)
        jTextField1.setText(null);
    stringtemp = jTextField1.getText();
    jTextField1.setText(stringtemp+"0");
    opflag=false;
}//GEN-LAST:event_jButton10ActionPerformed

private void jButton17ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton17ActionPerformed
// TODO add your handling code here:
    if(!decimalflag)
    {
        if(opflag)
        jTextField1.setText(null);
        stringtemp = jTextField1.getText();
        jTextField1.setText(stringtemp+".");
        opflag=false;
        decimalflag=true;
    }
    else
    {
        jTextField1.setText("error");
        resltemp=0;
        opflag=true;
        startflag=true;
    }
}//GEN-LAST:event_jButton17ActionPerformed

    /**
     * @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(swingCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(swingCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(swingCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(swingCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new swingCalc().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton10;
    private javax.swing.JButton jButton11;
    private javax.swing.JButton jButton12;
    private javax.swing.JButton jButton13;
    private javax.swing.JButton jButton14;
    private javax.swing.JButton jButton15;
    private javax.swing.JButton jButton16;
    private javax.swing.JButton jButton17;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JButton jButton6;
    private javax.swing.JButton jButton7;
    private javax.swing.JButton jButton8;
    private javax.swing.JButton jButton9;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration//GEN-END:variables
}
}