savingcaculatordone.java

Java 的计算器

/*
 * SavingCaculatorDone.java
 *
 * Created on 2008年11月11日, 下午7:14
 */

package savingcaculator;

/**
 *
 * @author  Administrator
 */
public class SavingCaculatorDone extends javax.swing.JFrame {

    /** Creates new form SavingCaculatorDone */
    public SavingCaculatorDone() {
        initComponents();
    }

    /** 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() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        BtnCalc = new javax.swing.JButton();
        BtnExit = new javax.swing.JButton();
        BtnNext = new javax.swing.JButton();
        txtCustomer = new javax.swing.JTextField();
        txtStartAmt = new javax.swing.JTextField();
        cboRate = new javax.swing.JComboBox();
        jScrollPane1 = new javax.swing.JScrollPane();
        lstNoYears = new javax.swing.JList();
        jScrollPane2 = new javax.swing.JScrollPane();
        txaDisplay = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setFont(new java.awt.Font("Algerian", 3, 36));
        jLabel1.setForeground(new java.awt.Color(51, 51, 255));
        jLabel1.setText("Saving Caculator");

        jLabel2.setFont(new java.awt.Font("宋体", 0, 24));
        jLabel2.setText("Customer:");

        jLabel3.setFont(new java.awt.Font("Tahoma", 1, 14));
        jLabel3.setText("Start Amount");

        jLabel4.setFont(new java.awt.Font("Tahoma", 1, 14));
        jLabel4.setText("Yearly % Rate");

        jLabel5.setFont(new java.awt.Font("Tahoma", 1, 14));
        jLabel5.setText("No. Years Deposited");

        BtnCalc.setBackground(new java.awt.Color(153, 204, 255));
        BtnCalc.setFont(new java.awt.Font("Tahoma", 1, 14));
        BtnCalc.setText("Calculate Savings");
        BtnCalc.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                BtnCalcActionPerformed(evt);
            }
        });

        BtnExit.setBackground(new java.awt.Color(153, 204, 255));
        BtnExit.setFont(new java.awt.Font("Tahoma", 1, 14));
        BtnExit.setText("Exit");
        BtnExit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                BtnExitActionPerformed(evt);
            }
        });

        BtnNext.setBackground(new java.awt.Color(153, 204, 255));
        BtnNext.setFont(new java.awt.Font("Tahoma", 1, 14));
        BtnNext.setText("Next Calculation");
        BtnNext.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                BtnNextActionPerformed(evt);
            }
        });

        txtStartAmt.setFont(new java.awt.Font("Tahoma", 0, 14));

        cboRate.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "0.72", "2.88", "3.24", "3.60" }));

        lstNoYears.setModel(new javax.swing.AbstractListModel() {
            String[] strings = { "1", "2", "3", "4", "5" };
            public int getSize() { return strings.length; }
            public Object getElementAt(int i) { return strings[i]; }
        });
        jScrollPane1.setViewportView(lstNoYears);

        txaDisplay.setColumns(20);
        txaDisplay.setRows(5);
        jScrollPane2.setViewportView(txaDisplay);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(37, 37, 37)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(4, 4, 4)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel3)
                                .addGap(27, 27, 27)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                    .addComponent(txtCustomer, javax.swing.GroupLayout.Alignment.TRAILING)
                                    .addComponent(txtStartAmt, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 126, Short.MAX_VALUE)))
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(jLabel4)
                                .addGap(18, 18, 18)
                                .addComponent(cboRate, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 8, Short.MAX_VALUE)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 294, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(jLabel5)
                                        .addGap(18, 18, 18)
                                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 98, javax.swing.GroupLayout.PREFERRED_SIZE))))))
                    .addComponent(jLabel1)
                    .addComponent(jLabel2)
                    .addComponent(BtnNext)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addComponent(BtnCalc, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(BtnExit, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                .addGap(46, 46, 46))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(53, 53, 53)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                    .addComponent(jLabel2)
                                    .addComponent(txtCustomer, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addGap(18, 18, 18)
                                .addComponent(jLabel3))
                            .addComponent(txtStartAmt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(33, 33, 33)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel4)
                            .addComponent(jLabel5)
                            .addComponent(cboRate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(BtnCalc)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(BtnNext)
                        .addGap(13, 13, 13)
                        .addComponent(BtnExit)
                        .addGap(34, 34, 34))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 210, Short.MAX_VALUE)
                        .addContainerGap())))
        );

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

private void BtnCalcActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnCalcActionPerformed
// TODO add your handling code here:
        double startAmt;
        double newAmt;
        int noYears;
        double rate=0;
        double interest=0;
        double total = 0;        
        String output="Years\tstartAmt\tinterest\ttotal"+"\n";
        
        startAmt = Integer.parseInt(txtStartAmt.getText());
      
        //get the rate
        switch(cboRate.getSelectedIndex()){
            case 0:
                rate=0.72;
                break;
            case 1:
                rate=2.88;
                break;
            case 2:
                rate=3.24;
                break;
            case 3:
                rate=3.60;
        }
        
        //get the No of years
        noYears=lstNoYears.getSelectedIndex()+1;
        
        for(int i=1;i<=noYears;i++){
            interest=startAmt*rate/100;
            total=startAmt + interest;
            output+=String.format("%4d\t%.2f\t%.2f\t%.2f\n",i,startAmt,interest,total);
            startAmt = total;      
            
          
        }
        txaDisplay.setText(output);
}//GEN-LAST:event_BtnCalcActionPerformed

private void BtnNextActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnNextActionPerformed
// TODO add your handling code here:
    txtCustomer.setText("");
    txtStartAmt.setText("");
    txaDisplay.setText("");
}//GEN-LAST:event_BtnNextActionPerformed

private void BtnExitActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnExitActionPerformed
// TODO add your handling code here:
    System.exit(0);
}//GEN-LAST:event_BtnExitActionPerformed

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new SavingCaculatorDone().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton BtnCalc;
    private javax.swing.JButton BtnExit;
    private javax.swing.JButton BtnNext;
    private javax.swing.JComboBox cboRate;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JList lstNoYears;
    private javax.swing.JTextArea txaDisplay;
    private javax.swing.JTextField txtCustomer;
    private javax.swing.JTextField txtStartAmt;
    // End of variables declaration//GEN-END:variables

}