cant find variables problems

[Ben Hultin]

.\Cat.java:26: cannot find symbol
symbol : variable selectedMouse
location: class java.util.ArrayList<Mouse>
mouseWeight = Mammal.getWeight(mice.selectedMouse);

^
.\Mouse.java:44: cannot find symbol
symbol : variable mouse1
location: class java.util.ArrayList<Mouse>
boolean mouse1Sex = Mammal.getIsMale(mice.mouse1);
^
.\Mouse.java:45: cannot find symbol
symbol : variable mouse2
location: class java.util.ArrayList<Mouse>
boolean mouse2Sex = Mammal.getIsMale(mice.mouse2);

I have declared these variables already inside the same method, so there is no issue with it being accessible or not.

My Mouse.java:

  
import java.util.*;



public class Mouse extends Mammal{

	Mammal mammal = new Mammal();
	Random random = new Random();

	public Mouse () { }

	public Mouse (int a, double w) {
		// mouse  constructor: (default constructor)

	// Randomly choose sex and assign to isMale as appropriate.
	int sexSelected = (int) (Math.random() * 1);
	
	isMale = (sexSelected == 1); 

	// Set age to 1.
	age = 1;

	// Set weight to 1.
	weight = 1.0;
	}
	
	
	public void setSex(boolean newIsMale)
    {
        isMale = newIsMale; 
    }

	public void grow () {
		// Increase age of mouse by 1 and weight of mouse by 1% of current weight.
		age += 1;
		weight += (weight * 0.01);
	
	} // end grow()
	
	public void mate (ArrayList<Mouse> mice) {
		// Randomly choose 2 mice objects from arraylist
		int mouse1 = Math.random(nextInt(mice.size()));
		int mouse2 = Math.random(nextInt(mice.size()));
		boolean mouse1Sex = Mammal.getIsMale(mice.mouse1);
		boolean mouse2Sex = Mammal.getIsMale(mice.mouse2);
		
		if (mouse1Sex != mouse2Sex) { // 1 male, 1 female mouse, Both mice older than 1 day
			// If successful mating, randomly create between 0-4 mice and append to arraylist received as argument.
			int offspring = (int) (Math.random() * 4);
			
			for (int i = 0; i <= offspring; i++) {
				mice.add(new Mouse());
			} // end for loop in mate()
		} // end if statement in mate()
	} // end mate()
	
} // end Mouse class





  

My Cat.java file:

  
import java.util.*;

public class Cat extends Mammal{

	Cat sylvester = new Cat();
	Mammal mammal = new Mammal();
	Random random = new Random();

	public void eat (ArrayList<Mouse> mice) {
	
// Randomly removes a mouse from the population 70% of the time and increases cat weight by the chosen 
// mouse weight. Only increase weight if mouse is removed/eaten. (See chapter 5, lottery example, 
// for random example)
//Random random = new Random();

	double catWeight;
	double mouseWeight;
	int selectedMouse;

	int percentagePicked = (int) (Math.random() * 100);
	
	if (percentagePicked <= 70) { // eat mouse if % is under 70%
		selectedMouse = (int) Math.random(nextInt(mice.size())); // select mouse from arraylist at random
		
		// get weight from selected mouse
		mouseWeight = Mammal.getWeight(mice.selectedMouse);
		
		// get weight from sylvester
		catWeight = sylvester.getWeight();
		
		// set new weight of added mouse weight
		sylvester.setWeight(catWeight + mouseWeight);
		
		// remove selectedMouse from Arraylist
		mice.remove(selectedMouse);
		
	}

	}

	public void grow () { // Set the cats age to the current age plus 1. (use accessor/mutator methods)
	
		int i;
		getAge ();
		setAge (i++);
	} // end grow method

} // end Cat class



  

I appreciate the help

[Ireneusz Kordal]

Ben Hultin wrote:
symbol : variable selectedMouse
location: class java.util.ArrayList<Mouse>
mouseWeight = Mammal.getWeight(mice.selectedMouse);

mice is declared as ArrayList .... ArrayList dos not have field named 'selectedMouse'

Ben Hultin wrote:
symbol : variable mouse1
location: class java.util.ArrayList<Mouse>
boolean mouse1Sex = Mammal.getIsMale(mice.mouse1);

mice is declared as ArrayList .... ArrayList dos not have field named 'mouse1'

Ben Hultin wrote: ^
symbol : variable mouse2
location: class java.util.ArrayList<Mouse>
boolean mouse2Sex = Mammal.getIsMale(mice.mouse2);

mice is declared as ArrayList .... ArrayList dos not have field named 'mouse2'

[David Newton]

And getIsMale shouldn't be a static method in Mammal, it should be an instance method of a Mammal.

Why do you construct a new Mammal in Mouse:8?

In any case--it still looks like you're just writing random code with the hope that it will compile and work. You really need to take a step back, write a *small* amount of code, make sure it compiles, make sure it does what you want, and move forward from there. Trying to fix *all* the problems at once is a sub-optimal solution (and there are a *lot* of problems here).

Make it easier on yourself and stop trying to do everything at once.

[Ben Hultin]

mice is declared as ArrayList .... ArrayList dos not have field named 'mouse1'

so how wpuld I go about giving ArrayList a field named 'mouse1'. Are you meaning to say that it is trying to access an element inside the array called mouse1? How would define the arraylist to access an index number that is stored inside a varaible?

[Henry Wong]

Ben Hultin wrote:so how wpuld I go about giving ArrayList a field named 'mouse1'. Are you meaning to say that it is trying to access an element inside the array called mouse1? How would define the arraylist to access an index number that is stored inside a varaible?

Click on any of the many ArrayList links that the JavaRanch forum provided for you, in this topic. They go to the JavaDoc which describes the methods that does exactly what you want.

Henry

[Steven Hill]

Where is the mammal class?