toString()

public class GeometricObject {
    protected String color;
    protected double weight;


    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public double getWeight() {
        return weight;
    }

    public void setWeigut(double weight) {
        this.weight = weight;
    }

    protected GeometricObject() {
        super();
        this.color = "white";
        this.weight = 1.0;
    }


    protected GeometricObject(String color, double weight) {
        super();
        this.color = color;
        this.weight = weight;
    }


}

public class Circle extends GeometricObject {
    private double radius;

    public Circle() {
        super();
//        this.color = "white";
//        this.weight = 1.0;
        this.radius = 1.0;
    }

    public Circle(double radius) {
        super();
        this.radius = radius;
    }

    public Circle(double radius, String color, double weight) {
        super(color, weight);
        this.weight = weight;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    /**
     * 求圆的面积
     * @return
     */
    public double findArea(){
        return 3.14 * radius * radius;
    }


    @Override
    public  boolean equals(Object obj){
        if(this == obj){
            return true;
        }
        if(obj instanceof  Circle){
            Circle circle = (Circle) obj;
            return this.radius == circle.radius;
        }
        return false;
    }

    @Override
    public  String toString(){
        return "Circle [ radios =" + radius + " ]";
    }

}

public class CicleTest {
    public static void main(String[] args) {
        Circle circleOne = new Circle(6.0);
        Circle circleTwo = new Circle(6.0,"white",2.0);
        System.out.println(circleOne.findArea());

        System.out.println(circleOne.getColor().equals(circleTwo.getColor()));
        System.out.println(circleOne.equals(circleTwo));

        System.out.println();
    }
}