outputting data from multiple methods in java - arrays

Question

currently the program is listing the planets in a solar system. each planet entered to the solarsystem has a position counter adding position++
after all the planets are listed I want to SystemPrintln a statement saying, There are this many planets in your solar system. Should I not be able to just return position; for this?
At this point the result is in a toString so to add this final line stating the number of planets how would I do this?
Could I add a second method "position" to the toString?
can I just return position in a system.out.println statement from the drive class?
class Planet:
package planets;
public class Planet {
String name;
int moons;
public Planet(String name, int moons)
{
this.moons = moons;
this.name = name;
}
public String toString() {
return "The Planet " + name + " Has " + moons + " Moon(s) \r\n ";
}
}
Class SolarSystem:
package planets;
public class SolarSystem {
private Planet[]planets;
private int position = 0;
public SolarSystem(int size) {
planets = new Planet[size];
}
public void add(Planet planet) {
planets[position] = planet;
position++;
}
public String toString(){
String result = "";
for(int i = 0; i < planets.length; i++){
result += planets[i].toString();
}
return result;
}
}
Class Driver:
package planets;
public class Driver {
public static void main(String[]args) {
Planet mercury = new Planet ("Mercury", 0);
Planet venus = new Planet ("Venus", 0);
Planet earth = new Planet ("Earth", 1);
Planet mars = new Planet ("Mars", 2);
Planet jupiter = new Planet ("Jupiter", 67);
Planet saturn = new Planet ("Saturn", 62);
Planet uranus = new Planet ("Uranus", 27);
Planet neptune = new Planet ("Neptune", 14);
Planet pluto = new Planet ("Pluto", 5);
SolarSystem solarSystem = new SolarSystem(9);
solarSystem.add(mercury);
solarSystem.add(venus);
solarSystem.add(earth);
solarSystem.add(mars);
solarSystem.add(jupiter);
solarSystem.add(saturn);
solarSystem.add(uranus);
solarSystem.add(neptune);
solarSystem.add(pluto);
System.out.println(solarSystem);
}
}

Answer 1

For your class you have to return the position variabel.
public int sumPlanets(){
return position;
}
and in your method toString use :
public String toString(){
return Integer.toString(sumPlanets());
}
but i recommend only use the position for return the total elements
public String toString(){
return position;
}
In your in your code :
package planets;
public class SolarSystem {
private Planet[]planets;
private int position = 0;
public SolarSystem(int size) {
planets = new Planet[size];
}
public void add(Planet planet) {
planets[position] = planet;
position++;
}
public String toString(){
return Integer.toString(sumPlanets());
}
public int sumPlanets(){
return position;
}
}

Answer 2

In order to print out the total number of planets I used the position variable which adds one each time a planets object is made.
position++
so to print this I added
System.out.println("You Have " + position + " Planets In Your Solar System");
Directly after the loop so It would be printed out one time with the total amount.
The full class ended up like this.
package planets;
public class SolarSystem {
private Planet[]planets;
private int position = 0;
public SolarSystem(int size) {
planets = new Planet[size];
}
public void add(Planet planet) {
planets[position] = planet;
position++;
}
public String toString(){
String result = "";
for(int i = 0; i < planets.length; i++){
result += planets[i].toString();
}
System.out.println("You Have " + position + " Planets In Your Solar System");
return result;
}
}