protected Modifier: Inheritance and Encapsulation

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:

• Create SavingsAccount instance
• Deposit 1000
• Add interest at 5% rate (0.05)
• Output balance

Output Format

Balance: 1050