Passing Objects as a Parameter in a Method in Java

package ch7.l9;

//Objects may be passed to methods.
class MyTest
{
	int a, b;
	MyTest(int i, int j) 
	{
		a = i;
		b = j;
	}
	
	// return true if obj is equal to the invoking object
	boolean equalTo(MyTest obj) 
	{
		if(obj.a == a && obj.b == b) {
			return true;
		}
		else 
			return false;
	}
}

public class PassingObjToMethod {

	public static void main(String[] args) {
		MyTest ob1 = new MyTest(10, 11);
		MyTest ob2 = new MyTest(10, 11);
		MyTest ob3 = new MyTest(-1, -1);
		System.out.println("ob1 == ob2: " + ob1.equalTo(ob2));
		System.out.println("ob1 == ob3: " + ob1.equalTo(ob3));

	}
}

ob1 == ob2: true
ob1 == ob3: false

package ch7.l9;

class Rectangle {
    double length;
    double breadth;

    // Constructor to initialize the dimensions of the rectangle
    public Rectangle(double length, double breadth) {
        this.length = length;
        this.breadth = breadth;
    }

    // Method to calculate the area of the rectangle
    public double calculateArea() {
        return length * breadth;
    }
}

public class PassingObject {
    // Method to compare the areas of two rectangles
    public void compareArea(Rectangle rect1, Rectangle rect2) {
        double area1 = rect1.calculateArea();
        double area2 = rect2.calculateArea();

        if (area1 > area2) {
            System.out.println("Rectangle 1 is larger with an area of " + area1);
        } else if (area2 > area1) {
            System.out.println("Rectangle 2 is larger with an area of " + area2);
        } else {
            System.out.println("Both rectangles have the same area of " + area1);
        }
    }

    // Main method to run a simple test
    public static void main(String[] args) {
        // Creating two rectangle objects
        Rectangle rectangle1 = new Rectangle(5.0, 2.0);
        Rectangle rectangle2 = new Rectangle(3.0, 4.0);

        // Creating an instance of RectangleOperations
        PassingObject po = new PassingObject();

        // Comparing the areas of the two rectangles
        po.compareArea(rectangle1, rectangle2);
    }
}

Rectangle 2 is larger with an area of 12.0