Modify methods so they are given an array index value of the moon whose name or radius is required - processing

Question

So the part of my question is ''Modify getMoonName() and getMoonRadius() so they are given an array index value of the moon whose name or radius is required.''
I've tried adding moons[i].getRadius but then end up getting ''The variable i does not exist''. Here's the code.
PLANET CLASS
public class Planet
{
private float angle=0.01;
// add class member variables here
private String name;
private float radius;
private float distance;
private float speed;
private Moon[] moons;
// add constructor here
public Planet(String n, float r, float d, float s, Moon[] m)
{
this.name=n;
this.radius=r;
this.distance=d;
this.speed=s;
this.moons=m;
}
// add other methods here
public String getName()
{
return name;
}
public float getRadius()
{
return radius;
}
public float getDistance()
{
return distance;
}
public float getSpeed()
{
return speed;
}
public Moon[] getMoons()
{
return moons;
}
public void setRadius(float r)
{
this.radius=r;
}
public String getMoonName()
{
return moons[i].getName();
}
public float getMoonRadius()
{
return moons[i].getRadius();
}
public String toString()
{
int n=0;
for (int i=0; i<moons.length; i++)
{
n++;
}
return "Planet" + name + ("Radius: " +radius +"Distance: " +distance) +n +"moons.";
}
public void printMoons()
{
for (int i=0; i<moons.length; i++)
{
System.out.println(moons[i]);
}
}
// This will display the moon when other code is completed. You don't need to understand this code.
public void display()
{
angle=angle+(0.01*speed);
pushMatrix();
rotate(angle);
translate(distance,0);
fill(255, 255, 255);
ellipse(0, 0, radius*2, radius*2);
for(Moon moon: getMoons())
moon.display();
popMatrix();
}
}`
MOON CLASS
public class Moon
{
private float angle=0.01;
// add class member variables here
private String name;
private float radius;
private float distance;
private float speed;
private int orbitalPeriod;
// add constructor here
public Moon(String n, float r, float d, float s, int o)
{
this.name=n;
this.radius=r;
this.distance=d;
this.speed=s;
this.orbitalPeriod=o;
}
// add other methods here
public String getName()
{
return name;
}
public float getRadius()
{
return radius;
}
public float getDistance()
{
return distance;
}
public float getSpeed()
{
return speed;
}
public float getOrbitalPeriod()
{
return orbitalPeriod;
}
public void setName(String n)
{
this.name=n;
}
public void setOrbitalPeriod(int o)
{
this.orbitalPeriod=o;
}
public String toString()
{
return ("Moon : " +name +" "+"orbit="+orbitalPeriod);
}
// This will display the moon when other code is completed. You don't need to understand this code.
public void display()
{
angle=angle+(0.01*speed);
pushMatrix();
rotate(angle);
translate(distance, 0);
fill(149, 149, 149);
ellipse(0, 0, radius*2, radius*2);
popMatrix();
}
}

Answer 1

Let's look at this function:
public String getMoonName()
{
return moons[i].getName();
}
Where do you think the i variable is defined? Your instructions say to take an argument, but this function does not take any arguments.
As a small example, let's say I had this function:
public void printMessage(){
println("Hello!");
}
If I wanted to modify that function to take a parameter, I would have to add that to the method like this:
public void printMessage(String message){
println(message);
}
You have to do something similar with your getMoonName() function.
If you're still stuck, please post a small example like mine instead of your whole sketch, and we'll go from there.