Notes

public abstract class BankAccount implements Transsactions {
private int accountID; // common data members are encapsulated in BankAccount hierarchy
private double balance; // the information of the superclass is hidden from other classes including its subclasses


public BankAccount(int accountID, double balance) { // parameterized constructor
this.setAccountID(accountID);
this.setBalance(balance);
}

public int getAccountID() {
return this.accountID;
}

public void setAccountID(int parameterID) {
if(parameterID<=0) { // input validation
System.out.println("ID of an account should be a positive integer. Its default value will be 111 !");
parameterID = 111;
}
this.accountID = parameterID;
}

public double getBalance() {
return this.balance;
}

public void setBalance(double parameterBalanceValue) {
if(parameterBalanceValue<0.0) { // input validation
System.out.println("The balance of an account should be a non-negative real value. Its default value will be 0.0 !");
parameterBalanceValue = 0.0;
}
this.balance = parameterBalanceValue;
}



public void printAccountInfo() {
System.out.println("Information of account :");
System.out.println("Account ID : " + this.getAccountID());
System.out.printf( "Account Balance : %.3f n" , this.getBalance());
}

}