protected Modifier: inheritance and Encapsulation

In this problem, you will create a program that implements a BankAccount class with a protected balance field and a SavingsAccount subclass that inherits from it, reads a deposit amount and interest rate from standard input, and displays the resulting balance to standard output.

Learning Objective: Understand field sharing within inheritance hierarchy using protected access modifier

Overview

The protected modifier allows access from the same package or child classes. It sits between private and public, designed for inheritance-based designs.

Specifications

Create parent class BankAccount:

• protected field balance (initial value 0)
• deposit(int amount) method: add to balance
• getBalance() method: return balance

Create child class SavingsAccount:

• Extends BankAccount
• addInterest(double rate) method: calculate and add interest to balance (balance × rate)
  • Directly access protected field balance

In Main class:

• Read deposit amount (integer) and interest rate (decimal) from standard input
• Create SavingsAccount instance
• Deposit the input amount
• Add interest at the input rate
• Output balance

Input Format

amount
rate

Output Format

Balance: <balance>