Polymorphism - method printing problem in Java
I am having problems with my code. So I have a GeoFig and Circle object that extends GeoFig. GeoFig contains private fields such as area, radius, and circumference. GeoFig also contains methods for setting and retrieving these fields. I tried to create a Circle object and create get methods but they don't work. Any advice? Here is my code below:
abstract public class GeoFig {
private double radius;
private double area;
private double circumference;
public void setRadius(double radius){
this.radius = radius;
}
public double getRadius(){
return this.radius;
}
public void setCircArea(double radius){
this.area = Math.pow(radius, 2) * Math.PI;
}
public double getCircArea(){
return this.area;
}
public void setCircumference(double radius){
circumference = 2*this.radius * Math.PI;
}
public double getCircumference(){
return this.circumference;
}
abstract String getMetrics();
public static void main(String[] args){
Circle circ = new Circle(2);
circ.getRadius();
}
}
public class Circle extends GeoFig {
public Circle(double radius) {
setRadius(radius);
setCircArea(radius);
setCircumference(radius);
}
@Override
public String getMetrics() {
return "Object of class Circle " +
"\nRadius:" + getRadius() +
"\nArea: " + getCircArea() +
"\nCircumference: " + getCircumference();
}
}
+3
source to share
3 answers
This worked for me. He prints2.0
abstract class GeoFig {
private double radius;
private double area;
private double circumference;
public void setRadius(double radius){
this.radius = radius;
}
public double getRadius(){
return this.radius;
}
public void setCircArea(double radius){
this.area = Math.pow(radius, 2) * Math.PI;
}
public double getCircArea(){
return this.area;
}
public void setCircumference(double radius){
circumference = 2*this.radius * Math.PI;
}
public double getCircumference(){
return this.circumference;
}
abstract String getMetrics();
public static void main(String[] args){
test circ = new test(2);
System.out.println(circ.getRadius()); }
}
public class test extends GeoFig {
public test(double radius){
setRadius(radius);
setCircArea(radius);
setCircumference(radius);
}
@Override
public String getMetrics(){
return "Object of class Circle " +
"\nRadius:" + getRadius() +
"\nArea: " + getCircArea() +
"\nCircumference: " + getCircumference();
}
}
0
source to share
I would suggest creating a method to display the content of the object you are trying to create eg. Create a ToSTRING method to view the contents of the object.
public void display () {
double radius = getRadius() ;
double area= getArea() ;
double circumference= getCircumference() ;
System.out.println("Radius" + radius + "Area" + area + "Circumference" + circumference) ;
} If you are using Eclipse for Windows control + alt s, you can create a ToSTRING method. Mac command + alt + s. hope it helps
0
source to share