[Solved] Identify the error in the following Java code snippet: class Car { private int speed; public void setSpeed(int speed) { speed = speed; } public int getSpeed() { return speed; } } | Java

Java - Encapsulation

Identify the error in the following Java code snippet:

class Car {
  private int speed;
  public void setSpeed(int speed) {
    speed = speed;
  }
  public int getSpeed() {
    return speed;
  }
}

AThe setter method does not update the private variable

BThe private variable speed should be public

CThe getter method should return void

DThe class Car should be declared public

Step-by-Step Solution

Solution:

Step 1: Analyze the setter method
The setter method assigns the parameter speed to itself, not to the private variable.
Step 2: Understand variable shadowing
The parameter speed shadows the private variable. To update the private variable, use this.speed = speed;.
Final Answer:
The setter method does not update the private variable -> Option A
Quick Check:
Use 'this' to update private variable in setter [OK]

Quick Trick: Use 'this.' to refer to class variable in setters [OK]

Common Mistakes:

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