Kalkulator i przelicznik paliwa

src/main/java/swing/kalkulator/LogikaKalkulatora.java

+package swing.kalkulator;
+
+public class LogikaKalkulatora {
+    
+    public static long oblicz(long arg1, long arg2, String operacja) {
+        switch(operacja) {
+            case "+": return arg1 + arg2;
+            case "-": return arg1 - arg2;
+            case "*": return arg1 * arg2;
+            case "/": return arg1 / arg2;
+            default : return 0;
+        }
+    }
+    
+}

src/main/java/swing/kalkulator/OknoKalkulatora.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/GUIForms/JFrame.java to edit this template
+ */
+package swing.kalkulator;
+
+import java.awt.Color;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
+
+/**
+ *
+ * @author patryk
+ */
+public class OknoKalkulatora extends javax.swing.JFrame {
+
+    /**
+     * Creates new form OknoKalkulatora
+     */
+    public OknoKalkulatora() {
+        initComponents();
+        mojeDodatki();
+    }
+    
+    private void mojeDodatki() {
+        DocumentListener dl = new DocumentListener() {
+            public void insertUpdate(DocumentEvent evt) {
+                przelicz();
+            }
+
+            public void removeUpdate(DocumentEvent evt) {
+                przelicz();
+            }
+
+            public void changedUpdate(DocumentEvent evt) {
+                przelicz();
+            }
+        };
+        
+        jTextField1.getDocument().addDocumentListener(dl);
+        jTextField2.getDocument().addDocumentListener(dl);
+    }
+
+    /**
+     * 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() {
+
+        jTextField1 = new javax.swing.JTextField();
+        jTextField2 = new javax.swing.JTextField();
+        jComboBox1 = new javax.swing.JComboBox<>();
+        jButton1 = new javax.swing.JButton();
+        jTextField3 = new javax.swing.JTextField();
+
+        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
+        setTitle("Kalkulator");
+        setResizable(false);
+
+        jTextField1.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
+        jTextField1.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
+
+        jTextField2.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
+        jTextField2.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
+
+        jComboBox1.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
+        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "+", "-", "*", "/" }));
+        jComboBox1.addActionListener(new java.awt.event.ActionListener() {
+            public void actionPerformed(java.awt.event.ActionEvent evt) {
+                jComboBox1ActionPerformed(evt);
+            }
+        });
+
+        jButton1.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
+        jButton1.setText("Oblicz");
+        jButton1.addActionListener(new java.awt.event.ActionListener() {
+            public void actionPerformed(java.awt.event.ActionEvent evt) {
+                jButton1ActionPerformed(evt);
+            }
+        });
+
+        jTextField3.setEditable(false);
+        jTextField3.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
+        jTextField3.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
+        jTextField3.setText("0");
+
+        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()
+                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
+                    .addGroup(layout.createSequentialGroup()
+                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 415, javax.swing.GroupLayout.PREFERRED_SIZE)
+                        .addGap(169, 169, 169)
+                        .addComponent(jTextField3))
+                    .addGroup(layout.createSequentialGroup()
+                        .addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 414, Short.MAX_VALUE)
+                        .addGap(18, 18, 18)
+                        .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE)
+                        .addGap(18, 18, 18)
+                        .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 415, javax.swing.GroupLayout.PREFERRED_SIZE)))
+                .addContainerGap())
+        );
+
+        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jTextField1, jTextField2});
+
+        layout.setVerticalGroup(
+            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
+            .addGroup(layout.createSequentialGroup()
+                .addContainerGap()
+                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
+                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
+                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
+                    .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
+                .addGap(18, 18, 18)
+                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
+                    .addComponent(jButton1)
+                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
+                .addContainerGap(20, Short.MAX_VALUE))
+        );
+
+        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {jButton1, jComboBox1, jTextField1, jTextField2, jTextField3});
+
+        pack();
+    }// </editor-fold>//GEN-END:initComponents
+
+    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
+        przelicz();
+    }//GEN-LAST:event_jButton1ActionPerformed
+
+    private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jComboBox1ActionPerformed
+        przelicz();
+    }//GEN-LAST:event_jComboBox1ActionPerformed
+
+    private void przelicz() {
+        if(jTextField1.getText().isEmpty() || jTextField2.getText().isEmpty()) {
+            jTextField3.setText("");
+        } else try {
+            long liczba1 = Long.parseLong(jTextField1.getText());
+            long liczba2 = Long.parseLong(jTextField2.getText());
+            // String operacja = jComboBox1.getItemAt(jComboBox1.getSelectedIndex());
+            String operacja = (String)jComboBox1.getSelectedItem();
+            long wynik = LogikaKalkulatora.oblicz(liczba1, liczba2, operacja);
+            jTextField3.setText(String.valueOf(wynik));
+            jTextField3.setForeground(Color.BLUE);
+        } catch(Exception e) {
+            jTextField3.setText("BŁĄD");
+            jTextField3.setForeground(Color.RED);
+        }
+    }
+
+    /**
+     * @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(OknoKalkulatora.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (InstantiationException ex) {
+            java.util.logging.Logger.getLogger(OknoKalkulatora.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (IllegalAccessException ex) {
+            java.util.logging.Logger.getLogger(OknoKalkulatora.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
+            java.util.logging.Logger.getLogger(OknoKalkulatora.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        }
+        //</editor-fold>
+        //</editor-fold>
+
+        /* Create and display the form */
+        java.awt.EventQueue.invokeLater(new Runnable() {
+            public void run() {
+                new OknoKalkulatora().setVisible(true);
+            }
+        });
+    }
+
+    // Variables declaration - do not modify//GEN-BEGIN:variables
+    private javax.swing.JButton jButton1;
+    private javax.swing.JComboBox<String> jComboBox1;
+    private javax.swing.JTextField jTextField1;
+    private javax.swing.JTextField jTextField2;
+    private javax.swing.JTextField jTextField3;
+    // End of variables declaration//GEN-END:variables
+}