class
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
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Consider the following class (which represents a bank account) for the following questions:
public class Account{
private int accountId;
private int userId;
private double balance;
public Account(int accountId, int userId, double balance){
this.accountId = accountId;
this.userId = userId;
this.balance = balance;
}
public Account(int accountId, int userId){
this.accountId = accountId;
this.userId = userId;
this.balance = 0;
}
public int getAccountId(){
return accountId;
}
public int getuserId(){
returnuserId;
}
public double getBalance(){
return balance;
}
public void withdraw(double amount){
if(checkWithdrawal(amount){
balance -= amount;
}
}
private boolean checkWithdrawal(double amount){
if(amount < balance){
return true;
}
return false;
}
public void deposit(double amount){
balance += amount;
}
}
Which of the following are possible proper ways (i.e, cause no compilation or runetime error) to instantiate/create a new Account object based on the above Account class? (choose all that apply)
A. Account d = new Account(12345);
B. Account b = new Account();
C. Account a = new Account(12345, 67890, 100);
D. Account c = new Account(12345, 67890);
E. Account e = new Account(12345, 67890.50, 100.50);
Of the following snippets, what are proper usages (i.e., will not cause a compilation or runetime error) of an Account object? (Assume an Account object has been successfully created and is held in the variable ‘acc’, which is of type Account) (Choose all that apply)
A. System.out.println(acc);
B.int balance = acc.getBalance();
C. boolean b = acc.checkWithdrawal(50.25);
D. acc.setBalance(1000.50);
Suppose a class SavingsAccount extended/inherited from the Account class. Select ALL of the following methods and attributes that would be available to the new SavingsAccount class that was inherited from Account.
A. getAccountId
B. userId
C. deposit
D. getBalance
E. checkWithdrawal
F. balance
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