[Solved] Identify the problem in this Java code snippet:class Account { private double balance; public void setBalance(double balance) { balance = balance; } } | Java

Java - Encapsulation

Identify the problem in this Java code snippet:

class Account {
  private double balance;
  public void setBalance(double balance) {
    balance = balance;
  }
}

AThe balance variable should be declared public.

BThe method parameter shadows the instance variable, so assignment does nothing.

CThe setBalance method should return a value.

DThe balance variable is not initialized.

Step-by-Step Solution

Solution:

Step 1: Understand variable shadowing
The parameter 'balance' shadows the instance variable 'balance'.
Step 2: Analyze assignment
Assignment 'balance = balance;' assigns the parameter to itself, not the instance variable.
Step 3: Correct approach
Use this.balance = balance; to assign parameter to instance variable.
Final Answer:
The method parameter shadows the instance variable, so assignment does nothing. -> Option B
Quick Check:
Use 'this' to refer to instance variables [OK]

Quick Trick: Use 'this' to distinguish instance variables [OK]

Common Mistakes:

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