loanaccount.java

A bank system

import java.text.DecimalFormat;
import java.util.ArrayList;

/**
 * This is LoanAccount class whcih is one type of Account class.
 * This class deals with the Loan account which allows people to make a loan
 *
 */
public class LoanAccount extends Account {
	private static final long serialVersionUID = 1L;
	public static double minimumLoanAmount;	//May be static
	private double numberOfYear;
	private double fixedInterestRate;
	private double loanRepaymentAmount;
	
	
	/**
	 * The constructor has a responsible to initial value for all essential data when the object is created
	 */
	public LoanAccount(){
		
		this.setAccountNumber(0);
		this.setAccountBalance(0.00);
		this.setOpeningBalance(0.00);
		this.setStatus('C');
		this.setAccountOwnerArrayList(null);
		this.setFixedInterestRate(0.00);
		this.setLoanRepaymentAmount(0.00);
		this.setNumberOfYear(0.00);
		
	}
	/**
	 * The constructor has a responsible to initial value for all essential data when the object is created
	 * @param accountNumber				: Account number of Account ID --> seven digit number	
	 * @param openingLoanAmount			: the initail loan amount
	 * @param interestRate				: the interest rate for calculating the loan repayment
	 * @param numberOfYear				: the duration of loan which can only be a number of years
	 * @param customerArrayListObject	: ArrayList of Customer class to keep the owner of this account
	 */
	public LoanAccount(	int accountNumber,
						double openingLoanAmount,
						double interestRate,
						double numberOfYear,// Whether be int or not
						ArrayList<Customer> customerArrayListObject){
		
		this.setAccountNumber(accountNumber);
		this.setAccountBalance(-openingLoanAmount);
		this.setOpeningBalance(-openingLoanAmount);
		this.setStatus('O');
		this.setAccountOwnerArrayList(customerArrayListObject);
		this.setFixedInterestRate(interestRate);
		this.setNumberOfYear(numberOfYear);
		
		this.setLoanRepaymentAmount(calculateLoan(openingLoanAmount,interestRate,numberOfYear));
		
		DecimalFormat decimalPattern = new DecimalFormat("0.00");
		System.out.println("Monthly Repayment: " + decimalPattern.format(this.getLoanRepaymentAmount()));
	}
	
	public void deposit(	int accountNumber, 
							double repaymentAmount, 
							ArrayList<Transaction> transactionArrayListObject){
		if(this.getAccountNumber() == accountNumber){
			if(repaymentAmount >= this.loanRepaymentAmount){
				double tempAccountBalance = this.getAccountBalance(); 
				tempAccountBalance = tempAccountBalance + repaymentAmount;
				if(tempAccountBalance <= 0){
					this.setAccountBalance(tempAccountBalance); 
			
					Transaction tObject = new Transaction();
					tObject.setAccountNumber(accountNumber);
					tObject.setTransactionType("DEPOSIT");
					tObject.setAmount(repaymentAmount);
					tObject.setBalance(tempAccountBalance);
					if(this.getAccountBalance() == 0.00){
						this.setStatus('C');
					}
					
					//Add transaction object to ArrayList of Transaction class
					transactionArrayListObject.add(tObject);	
					this.getTransactionHistoryArrayList().add(tObject);
				}else{
					DecimalFormat decimalPattern = new DecimalFormat("0.00");
					System.out.println("ERROR DEPOSIT : You can deposit only $"+decimalPattern.format(this.getAccountBalance()));
				}
			}else{
				DecimalFormat decimalPattern = new DecimalFormat("0.00");
				System.out.println("ERROR DEPOSIT : The deposit amount must >= loan repayment amount("
									+decimalPattern.format(this.loanRepaymentAmount)+")");
			}
		}else{
			System.out.println("Error!!! Wrong account number");
		}
	}
	
	public void withdraw(int accountNumber, double amount, ArrayList<Transaction> transactionArrayListObject){
		System.out.println("ERROR WITHDRAW LOAN account cannot withdraw!!!");
	}
	
	public void transaction(int accountNumber){
		DecimalFormat decimalPattern = new DecimalFormat("0.00");
		
		if(this.getAccountNumber() == accountNumber){
			System.out.println("Account number: 	"+this.getAccountNumber());
			System.out.print("Account owners: 	");
			
			for(Customer c: this.getAccountOwnerArrayList()){
				System.out.print(c.getCustomerID());
				System.out.print(" ");
			}
			
			System.out.println("");
			System.out.println("Interest rate:	"+decimalPattern.format(this.getFixedInterestRate())+" %");
			System.out.println("Duration:	"+this.getNumberOfYear());
			System.out.println("Repayment:	"+decimalPattern.format(this.getLoanRepaymentAmount()));
			
			System.out.printf("Opening balance:	");
			System.out.printf("$%-20.2f",this.getOpeningBalance());	
			System.out.println();
			for(Transaction t:this.getTransactionHistoryArrayList())
			{
				System.out.printf(t.getTransactionType()+"  \t");
				System.out.printf("\t$%-20.2f\t$%-20.2f%n",t.getAmount(),t.getBalance());
			}
		}else{
			System.out.println("Error!!! Wrong account number");
		}
	}
	
	/**
	 * This method is calculating the loan repayment amount
	 * @param loanAmount	: the amount of loan
	 * @param interestRate	: the interest rate for calculating the loan repayment
	 * @param numberOfYear	: the duration of loan which can only be a number of years
	 * @return repaymentAmount	: the amount of repayment per month
	 */
	private double calculateLoan(	double loanAmount,
									double interestRate,
									double numberOfYear
									){

			interestRate = (interestRate/100);	// To transform the input interest into percentage
			int numberOfMonths = 0;// Input only be years so I assume that month = 0

			double repaymentAmount 
			=(loanAmount*interestRate*(Math.pow((1+interestRate),numberOfYear))*(12+(interestRate*numberOfMonths)))/
			(12*(interestRate*numberOfMonths+((12+interestRate*numberOfMonths)*((Math.pow((1+interestRate),numberOfYear))-1))));

			return repaymentAmount;
	}
	public double getFixedInterestRate() {
		return fixedInterestRate;
	}
	public void setFixedInterestRate(double fixedInterestRate) {
		this.fixedInterestRate = fixedInterestRate;
	}
	public double getLoanRepaymentAmount() {
		return loanRepaymentAmount;
	}
	public void setLoanRepaymentAmount(double loanRepaymentAmount) {
		this.loanRepaymentAmount = loanRepaymentAmount;
	}
	public double getMinimumLoanAmount() {
		return minimumLoanAmount;
	}
	public double getNumberOfYear() {
		return numberOfYear;
	}
	public void setNumberOfYear(double numberOfYear) {
		this.numberOfYear = numberOfYear;
	}
	
		

}