Answer to Question #178143 in Java | JSP | JSF for fify

Question

Method overriding to calculate simple interestCreate an abstract class Bank with method calculateSimpleInterest method which takes the amount of type double and time of type int (in years) as parameters and returns double type simple interest with interest at 6 PPA.

 

Create classes BankA, BankB and BankC which extends class Bank and override the method calculateSimpleInterest. Class BankA, BankB, and BankC calculate the interest at 10 PPA, 9 PPA, and 7 PPA respectively in an overridden method.

 

Input

   1

   45000

   3

   where,

• First line represents a choice for calling one of the three classes. (1 for BankA, 2 for BankB and 3 for BankC)
• Second line represents principal amount.
• Third line represents time in years.

 

 

Output

   13500.00

 

  where the output in 2 decimal numbers.

Answer 1

import java.util.Scanner;


public class Q178143 {
	/**
	 * abstract class Bank
	 * @author Stavr
	 *
	 */
	public static abstract class Bank{
		/**abstract
		 * method calculateSimpleInterest method which takes the amount of type double and time of type int (in years) 
		 * as parameters and returns double type simple interest with interest at 6 PPA.
		 * @param principalAmount
		 * @param years
		 * @return
		 */
		public double calculateSimpleInterest(double principalAmount,int years) {
			final double PPA=0.06;
			return principalAmount*(1+PPA*years)-principalAmount;
			
		}
	}
	public static class BankA extends Bank{
		@Override
		public double calculateSimpleInterest(double principalAmount,int years) {
			final double PPA=0.1;
			return principalAmount*(1+PPA*years)-principalAmount;
		}
	}
	public static class BankB extends Bank{
		@Override
		public double calculateSimpleInterest(double principalAmount,int years) {
			final double PPA=0.09;
			return principalAmount*(1+PPA*years)-principalAmount;
		}
	}
	public static class BankC extends Bank{
		@Override
		public double calculateSimpleInterest(double principalAmount,int years) {
			final double PPA=0.07;
			return principalAmount*(1+PPA*years)-principalAmount;
		}
	}


	/**
	 * The start point of the program
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		// Create Scanner object
		Scanner keyboard = new Scanner(System.in);
		try {
			// Get the input values
			System.out.print("Select bank (1 for BankA, 2 for BankB and 3 for BankC): ");
			int choice =keyboard.nextInt();
			Bank selectedBank=null;
			if(choice==1) {
				selectedBank=new BankA();	
			}
			if(choice==2) {
				selectedBank=new BankB();	
			}
			if(choice==3) {
				selectedBank=new BankC();	
			}
			System.out.print("Enter principal amount: ");
			double principalAmount = keyboard.nextDouble();
			System.out.print("Enter time in years: ");
			int years =keyboard.nextInt();
			if(selectedBank!=null) {
				System.out.println("Simple interest: "+String.format("%.2f",selectedBank.calculateSimpleInterest(principalAmount, years)));
			}else {
				System.out.println("Select correct bank.");
			}
		
		} catch (Exception e) {
			// Display error message
			System.out.println(e.getMessage());
		}
		// close Scanner
		keyboard.close();
	}


}