zad 1

class Account {
 final public int SAVING = 0;
 final public int CHEQUE = 1;
 final public int FIXED = 2; //Portuguese currency
 private int accountType;
 private double balance;
 public double getInterestRate(...) { // Some method;
  ...
 }
 public Account(int accountType) {
  this.accountType = accountType;
 }
 public double calcInterest() {
  switch (accountType) {
   case SAVING:
    return balance * getInterestRate();
   case CHEQUE:
    return 0;
   case FIXED:
    return balance * (getInterestRate() + 0.02);
  }
 }
}

zad 2

class ParticipantsInDB {
 Connection conn;
 final String tableName = "participants";
 void addParticipant(Participant part) {
   PreparedStatement st = conn.prepareStatement("INSERT INTO " + tableName + "
    VALUES( ? , ? , ? , ? , ? )
    ");
    try {
     st.setString(1, part.getId());
     st.setString(2, part.getEFirstName());
     st.setString(3, part.getELastName());
     //...
     st.executeUpdate();
    } finally {
     st.close();
    }
   }
   void deleteAllParticipants() {
    PreparedStatement st = conn.prepareStatement("DELETE FROM " + tableName);
    try {
     st.executeUpdate();
    } finally {
     st.close();
    }
   }
   void deleteParticipant(String participantId) {
    PreparedStatement st = conn.prepareStatement("DELETE FROM " + tableName + "
     WHERE id = ? ");
     try {
      st.setString(1, participantId);
      st.executeUpdate();
     } finally {
      st.close();
     }
    }
   }

 zad 3
 class Form1 extends JDialog {
 JComboBox comboBoxReportType;
 Form1() {
  comboBoxReportType = new JComboBox();
  comboBoxReportType.addItem("r1");
  comboBoxReportType.addItem("r2");
  ...
  comboBoxReportType.addItem("r31c");
 }
 void processReport1() {
  //print some fancy report...
 }
 void processReport2() {
   //print another totally different fancy report...
  }
  ...
  void processReport31c() {
   //print yet another totally different fancy report...
  }
 void printReport(String repNo) {
  if (repNo.equals("r1"))
   processReport1();
  else if (repNo.equals("r2"))
   processReport2();
  ...
  else if (repNo.equals("r31c"))
   processReport31c();
 }
 void onPrintClick() {
   printReport((String) comboBoxReportType.getSelectedItem());