I need help on an equals method

[ryan vines]

I am currently working on an object, and writing a class(Trangle) that extends another class of an object. I am stuck on inputting an eaquals method in the ain object method. Basically i dont know where to put it. The code i am supposed to use is

 object1.equals(object2)

My enitre code is quite long, but here it is.

package Chapter8;
public class CHapter8_1 {
    
    /** Creates a new instance of CHapter8_1 */
    public static void main(String[] args) {
        Triangle myTriangle = new Triangle();
        
        System.out.println(myTriangle.toString());
    }
    
}
abstract class GeometricObject {
    private String color = "white";
    private boolean filled;
    
    protected GeometricObject() {
        }
    protected GeometricObject(String color, boolean filled) {
            this.color = color;
            this.filled = filled;
        }
    public String getColor() {
            return color;
        }
    public void setColor(String color) {
            this.color = color;
        }
        public boolean isFilled() {
            return filled;
        }
        public void setFilled(boolean filled) {
            this.filled = filled;
        }
        public abstract double findArea();
        
        public abstract double findPerimeter();
        
        
    }
class Triangle extends GeometricObject {
    private double side1;
    private double side2;
    private double side3;
    
    public Triangle() {
        this(1.0, 2.0, 1.0);
    }
    public Triangle(double side1, double side2, double side3) {
        this(side1, side2, side3, "white", false);
    }
    public Triangle(double side1, double side2, double side3, String color, boolean filled) {
        super(color, filled);
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }
    
    public double getside1() {
        return side1;
    }
    public void setSide1( double side1) {
        this.side1 = side1;
    }
    public double getside2() {
        return side2;
    }
    public void setSide2( double side2) {
        this.side2 = side2;
    }
    public double getside3() {
        return side3;
    }
    public void setSide3( double side3) {
        this.side3 = side3;
    }
    public double findArea() {
        double s;
        s = (side1 + side2 + side3) / 2;
        return Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
    }
    public double findPerimeter() {
        return side1 + side2 + side3;
    }
    public boolean equals(Triangle triangle) {
        return (area == triangle.findArea()) && (perimeter == triangle.findPerimeter());
    }
    public String toString() {
        return "[Triangle] area = " + area + "\n [Triangle] perimeter = " + perimeter;
}
}

public boolean equals(Triangle triangle) {
        return (area == triangle.findArea()) && (perimeter == triangle.findPerimeter());
    }

this is the methed that i need object1.equals(object2) to reference to.

[Sonny Gill]

Hi,
I only had a quick look thru the whole code,
but I think you can put it anywhere in Triangle class.
Also, I think the signature of equals method should be
boolean equals(Object a),
and not boolean equals(Triangle t)
to properly over-ride the equals method in Object.
Then in the method you can do a check like
if (!(a instanceof T)) return false
hope that helps!

[Tom Blough]

You might want to consider two triangle objects "equal" if they both have the same color, are both filled or unfilled, and have the same verticies. This is in lieu of only considering objects equal if they are the exact same object.

[ryan vines]

Thanks a lot guys. I fully understand the problem now. And again, i think all of tyou very much.
Ryan Vines