Question

I need help Writing a test java program that creates objects of Account, SavingsAccount, and CheckingAccount and invokes their toString() methods.

Account.java

TestBankAccount.java

Answer 1

File name :Account.java

class Account{//base class definition
   //class variables declaration
   private static int nextAvailableAcctNumber=0;//variable common for all the objects
   double bal;
   int number;
   //constructors definition
   Account(double bal){
       nextAvailableAcctNumber++;
       number=nextAvailableAcctNumber;
       this.bal=bal;  

   }
   Account(){
       this(0.00);
   }
   Account(Account acct){
       this.bal=acct.bal;
       this.number=acct.number;
      
   }
   //method for deposit
   void deposit(double amt){
       if(amt>0)
           bal+=amt;
   }
   //method to override the object class toString method to return the details of the class
   public String toString(){

       return "\nAccount number: "+number+"\nBalance: "+bal;
   }
   //method to compare two objects of Accont type
   public boolean equals(Account thisAccount){
       if(this.number==thisAccount.number)
           return true;
       else
           return false;

   }
   //method to return the balance of the account
   double getBal(){
       return bal;
   }
   //method to return the account number
   int getAcctNumber(){
       return number;
   }
}
File name:SavingsAccount.java

class SavingsAccount extends Account{
   double rate;
   static double DEFAULT_RATE=0.05,DEFAULT_BALANCE=1000.00;
   SavingsAccount(double bal,double rate){
       super(bal);//to call the parent class constructor
       this.rate=rate;
  
   }
   SavingsAccount(double bal){
       super(bal);
       rate=DEFAULT_RATE;  
   }
   SavingsAccount(){
       super(DEFAULT_BALANCE);
       rate=DEFAULT_RATE;      

   }
   SavingsAccount(SavingsAccount acct){
       super(acct);
       rate=acct.rate;
      
   }
  
   double compound(){
       return bal+=bal*rate;  
   }
   double withd(double amt){
       if(amt<bal)
           bal-=amt;
       else
           amt=0;
       return amt;
      
   }
   double getRate(){
       return rate;
   }
   public String toString(){
       return "\n"+super.toString()+"\nRate: "+rate;

   }
}
File Name :CheckingAccount.java

class CheckingAccount extends Account{
   double limit,charge;
   static double DEFAULT_LIMIT=1000.00,DEFAULT_CHARGE=2.00;
   CheckingAccount(double bal,double limit,double charge){
       super(bal);
       this.limit=limit;
       this.charge=charge;
   }
   CheckingAccount(double bal){
       super(bal);
       limit=DEFAULT_LIMIT;
       charge=DEFAULT_CHARGE;

   }
   CheckingAccount(){
       super(1000.00);
       limit=DEFAULT_LIMIT;
       charge=DEFAULT_CHARGE;

   }
   CheckingAccount(CheckingAccount acct){
       super(acct);
       limit=acct.limit;
       charge=acct.charge;

   }                  
  
   //methods
   double withd(double amt){
       if(amt<bal)
           bal-=amt;
       else
           amt=0;
       return amt;

   }
   public String toString(){
       return "\n"+super.toString()+"\nLimit: "+limit+"\nCharge: "+charge;

   }
   double getLimit(){
       return limit;
   }
   double getCharge(){
       return charge;
   }

}
File name :TestBankAccount.java

//driver class to test other classes
class TestBankAccount{
   public static void main(String args[]){
       //SavingAccount class checking
       SavingsAccount sa1=new SavingsAccount(2000,8);
       SavingsAccount sa2=new SavingsAccount(3000);
       SavingsAccount sa3=new SavingsAccount();
       SavingsAccount sa4=new SavingsAccount(sa3);
      
       System.out.println(sa1.toString());
       System.out.println(sa2.toString());
       System.out.println(sa3.toString());
       System.out.println(sa4.toString());
       System.out.println("\nBalance :"+sa2.getBal());
       System.out.println("Account Number :"+sa2.getAcctNumber());
       System.out.println("getRate() :"+sa2.getRate());
       System.out.println("Amount withdrawl :"+sa2.withd(200));
       System.out.println("Afer withdrawl :"+sa2.getBal());
       System.out.println("Test for equals() :"+sa3.equals(sa4));
       System.out.println("After compounding :"+sa3.compound());

       //ChekingAccount class verification
  
       CheckingAccount ca1=new CheckingAccount(2000,500.00,5.00);
       CheckingAccount ca2=new CheckingAccount(3000);
       CheckingAccount ca3=new CheckingAccount();
       CheckingAccount ca4=new CheckingAccount(ca3);
      
       System.out.println(ca1.toString());
       System.out.println(ca2.toString());
       System.out.println(ca3.toString());
       System.out.println(ca4.toString());
       System.out.println("\nBalance :"+ca2.getBal());
       System.out.println("Account Number :"+ca2.getAcctNumber());
       //System.out.println("getRate() :"+ca2.getRate());
       System.out.println("Amount withdrawl :"+ca2.withd(200));
       System.out.println("Afer withdrawl :"+ca2.getBal());
       System.out.println("Test for equals() :"+ca3.equals(ca4));
       System.out.println("Balance before deposit :"+ca3.getBal());
       ca3.deposit(5000);
       System.out.println("Balance after deposit of 5000:"+ca3.getBal());
   }
}

Output:

Explanation:

the above program includes not only the toString method it also includes different constructors, different methods