How to add elements to array in java

Question

Write an instance method, updateWeight(double rate) in java that updates the weight for all animals in a collection of animals. There are getters and setters for weight already. Here is a sample of animal class.

public Animal(String t, String n, String v,

boolean fly, int numlegs, double weight) {

Answer 1

Assuming your list of animals is maintained as an instance variable for a Zoo class, and assuming the Animal class has a setWeight() method, you could do something like this:

public class Zoo {

ArrayList<Animal> animals = new ArrayList<Animal>();

//...

public void updateWeight (double weight) {

for (Animal animal:animals) {

animal.setWeight(weight);

}

}

}

The answer would be slightly different for an array of Animal, but the substance is the same.