[Solved] Given the class below, how can you create a method that returns a new Rectangle object with double the width and height of the current one?class Rectangle { int width; int height;... | Java

Java - Object-Oriented Programming Concepts

Given the class below, how can you create a method that returns a new Rectangle object with double the width and height of the current one?

class Rectangle {
  int width;
  int height;

  Rectangle(int w, int h) {
    width = w;
    height = h;
  }

  // Your method here
}

ARectangle doubleSize() { return new Rectangle(width * 2, height * 2); }

Bvoid doubleSize() { width *= 2; height *= 2; }

CRectangle doubleSize() { width *= 2; height *= 2; return this; }

DRectangle doubleSize() { return new Rectangle(width + 2, height + 2); }

Step-by-Step Solution

Solution:

Step 1: Understand the requirement
The method should return a new Rectangle object with width and height doubled, without changing the current object.
Step 2: Evaluate each option
Rectangle doubleSize() { return new Rectangle(width * 2, height * 2); } creates and returns a new Rectangle with doubled dimensions. void doubleSize() { width *= 2; height *= 2; } changes current object and returns void. Rectangle doubleSize() { width *= 2; height *= 2; return this; } changes current object and returns it. Rectangle doubleSize() { return new Rectangle(width + 2, height + 2); } adds 2 instead of doubling.
Final Answer:
Rectangle doubleSize() { return new Rectangle(width * 2, height * 2); } -> Option A
Quick Check:
Return new object with doubled size = Rectangle doubleSize() { return new Rectangle(width * 2, height * 2); } [OK]

Quick Trick: Return new object; don't modify current one [OK]

Common Mistakes:

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Given the class below, how can you create a method that returns a new Rectangle object with double the width and height of the current one?