@@ -0,0 +1,90 @@
+package bankaccountquiz;
+import java.util.Date;
+/**
+ *
+ * @author Ares
+ */
+public class BankAccount {
+
+    private long accId;
+    private double balance;
+    private Date dateCreated;
+    private Customer cust;
+    private static final String ACCTYPE="";
+    private static int generate_id=10001;
+
+    public BankAccount() {
+    }
+    
+    public String getAccType(){
+        return BankAccount.ACCTYPE;
+    }
+
+    public long getAccId() {
+        return accId;
+    }
+
+   public long genAccountId(){
+       accId=generate_id++;
+       return accId;
+   }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    private void setBalance(double balance) {
+        this.balance = balance;
+    }
+
+    public Date getDateCreated() {
+        return dateCreated;
+    }
+
+    public void setDateCreated(Date dateCreated) {
+        this.dateCreated = dateCreated;
+    }
+
+    public Customer getCust() {
+        return cust;
+    }
+
+    public void setCust(Customer cust) {
+        this.cust = cust;
+    }
+    
+    public void deposit(double amount){
+        if(!(amount<0)){
+            this.setBalance(this.getBalance()+amount);
+        }
+        else{
+            System.err.println("Error from deposit : Amount is less than zero.");
+        }
+    }
+    
+    public void withdraw(double amount){
+        if(!(amount<0 || (amount>this.getBalance()))){
+            this.setBalance(this.getBalance()-amount);
+        }
+        else{
+           System.err.println("Error from withdraw : Amount is less than zero or amount is greater than your balance."); 
+        }
+    }
+    
+    public void transfer(BankAccount target,double amount){
+       if(!(amount<0 || (amount>this.getBalance()))){
+            this.setBalance(this.getBalance()-amount);
+            target.deposit(amount);
+        }
+       else{
+           
+       }
+    }
+
+    @Override
+    public String toString() {
+        return "BankAccount{" + "accId=" + accId + ", balance=" + balance + ", dateCreated=" + dateCreated + ", cust=" + cust + ", ACCTYPE="+BankAccount.ACCTYPE+'}';
+    }
+  
+    
+}
@@ -0,0 +1,32 @@
+package bankaccountquiz;
+
+/**
+ *
+ * @author Ares
+ */
+public class CurrentDepositAccount extends BankAccount {
+    private static final String ACCTYPE="Current Deposit Account";
+    private long linkSavingsAccount;
+
+    public CurrentDepositAccount() {
+    }
+
+    @Override
+    public String getAccType() {
+        return CurrentDepositAccount.ACCTYPE;
+    }
+
+    public long getLinkSavingsAccount() {
+        return linkSavingsAccount;
+    }
+
+    public void setLinkSavingsAccount(long linkSavingsAccount) {
+        this.linkSavingsAccount = linkSavingsAccount;
+    }
+
+    @Override
+    public String toString() {
+        return "CurrentDepositAccount{" +super.toString() + ", linkSavingsAccount=" + linkSavingsAccount + '}';
+    }
+    
+}
@@ -0,0 +1,8 @@
+package bankaccountquiz;
+/**
+ *
+ * @author Ares
+ */
+public class Customer {
+    // do something
+}
@@ -0,0 +1,59 @@
+package bankaccountquiz;
+
+/**
+ *
+ * @author Ares
+ */
+public class SavingsAccount extends BankAccount {
+    private static final String ACCTYPE="Savings Account";
+    private double interestRate;
+    private static double TRANSFER_FEE=20;
+
+    public SavingsAccount() {
+    }
+
+    public double getInterestRate() {
+        return interestRate;
+    }
+
+    public void setInterestRate(double interestRate) {
+        this.interestRate = interestRate;
+    }
+    
+    public void addInterest(){
+        double balance=super.getBalance()*this.interestRate;
+        super.deposit(balance);
+    }
+
+    @Override
+     public String getAccType(){
+        return SavingsAccount.ACCTYPE;
+    }
+
+    @Override
+    public void transfer(BankAccount target, double amount) {
+        if(target instanceof CurrentDepositAccount){
+            CurrentDepositAccount tg=(CurrentDepositAccount)target;
+            if(this.getAccId()==tg.getLinkSavingsAccount()){
+                super.withdraw(amount+SavingsAccount.TRANSFER_FEE);
+                target.deposit(amount);
+            }
+            else{
+               super.withdraw(amount);
+               target.deposit(amount); 
+            }
+        }
+        else{
+            super.withdraw(amount);
+            target.deposit(amount); 
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "SavingsAccount{"+super.toString() + ", interestRate=" + interestRate + '}';
+    }
+    
+    
+    
+}
@@ -0,0 +1,17 @@
+package bankaccountquiz;
+
+/**
+ *
+ * @author Ares
+ */
+public class TestBankAccount {
+    public static void main(String[] args) {
+        BankAccount ba=new SavingsAccount();
+        BankAccount ba1=new CurrentDepositAccount();
+        ba.deposit(3000);
+        CurrentDepositAccount ba1Tran=(CurrentDepositAccount)ba1;
+        ba1Tran.setLinkSavingsAccount(1);
+        ba.transfer(ba1Tran,300);
+        System.out.println(ba.getBalance());
+    }
+}