calculator.java

simulating a calculator in java

public class Calculator extends javax.swing.JFrame {
    
    /** Creates new form Calculator */
    public Calculator() {
        initComponents();
        setSize(500,150);
    }
 
  
    private void initComponents() {
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jComboBox1 = new javax.swing.JComboBox();
        jButton2 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();

        getContentPane().setLayout(null);

        setTitle("Mini Calculator");
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });

        jTextField1.setToolTipText("Primul argument");
        getContentPane().add(jTextField1);
        jTextField1.setBounds(20, 60, 70, 20);

        jTextField2.setToolTipText("Al doilea argument");
        getContentPane().add(jTextField2);
        jTextField2.setBounds(190, 60, 60, 20);

        jTextField3.setToolTipText("Rezultatul");
        getContentPane().add(jTextField3);
        jTextField3.setBounds(310, 60, 80, 20);

        jButton1.setText("=");
        jButton1.setToolTipText("Calculeaza!");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        getContentPane().add(jButton1);
        jButton1.setBounds(250, 60, 50, 26);

        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "+", "-", "*", "/", "^", "sin", "radical" }));
        jComboBox1.setToolTipText("Pt. un singur argument se introduce oarece  la al doilea argument");
        getContentPane().add(jComboBox1);
        jComboBox1.setBounds(100, 60, 80, 25);

        jButton2.setText("Sterge");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        getContentPane().add(jButton2);
        jButton2.setBounds(400, 60, 72, 26);

        jLabel1.setText("Operatia:");
        getContentPane().add(jLabel1);
        jLabel1.setBounds(100, 40, 80, 16);

        jLabel2.setText("Operator1:");
        getContentPane().add(jLabel2);
        jLabel2.setBounds(20, 40, 70, 16);

        jLabel3.setText("Operator2:");
        getContentPane().add(jLabel3);
        jLabel3.setBounds(180, 40, 70, 16);

        jLabel4.setText("Rezultat");
        getContentPane().add(jLabel4);
        jLabel4.setBounds(310, 40, 80, 16);

        pack();
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        
         jTextField1.setText("");
         jTextField2.setText("");
         jTextField3.setText("");
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        double x,y,z=0;
        Double xx,yy,zz;
        String s1,s2;
        s1=jTextField1.getText();
        s2=jTextField2.getText();
        xx=Double.valueOf(s1);
        yy=Double.valueOf(s2);
        x=xx.doubleValue();
        y=yy.doubleValue();
        switch (jComboBox1.getSelectedIndex()){
            case 0:z=x+y; break;
            case 1:z=x-y; break;
            case 2:z=x*y; break;
            case 3: if (y!=0) z=x/y;
             else {jTextField3.setText("Impartire la zero!");return;}
            case 4:z=java.lang.Math.pow(x,y);break;
            case 5:z=java.lang.Math.sin(x);break;
            case 6: z=java.lang.Math.sqrt(x);break;
        }
    
    jTextField3.setText(String.valueOf(z));
    }
    
   
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    }
    
   
    public static void main(String args[]) {
        new Calculator().show();
    }
    
    private javax.swing.JLabel jLabel4;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JButton jButton1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JComboBox jComboBox1;
    private javax.swing.JTextField jTextField1;
    
    
}