Question

Hello I would like to create a Class which contains an array with the same class.

I tried with the code specified below, but the array i created has been infinite.

public class State {

private String Valor1;
private String Valor2;
private ArrayList arrayStatesAnteriores;

}

And i did the set and get with the refactor of netbeans

state.setArrayStatesAnteriores(arrayStateAnteriores);

But i have the problem of array being infinite. Any idea?

Answer 1

Here’s the way I understand it: You have a class that represents a program’s state in a given moment, and you want to keep a list of the state that the program has had, that’s why you say it’s an infinite list.

First the State class, which has two fields value1 and value2 one constructor which sets the two fields to the passed values:

public class State {

    /**
     * This is the constructor 
    */
    public State(String value1, String value2){
        this.value1 = value1;
        this.value2 = value2;
    }

    // Omiting getters/setters for brevety.
    // This will be set by the constructor using the values that it
    // receives as arguments 
    // e.g
    // new State("My Val1","My Val2");
    private String value1;
    private String value2;
}

Then this class would be contained in an array of States

List<State> states =  new ArrayList<States>();

Then you would use this classes in your main or other classes:

import State;
public class Program {

    // This array holds the states that the program has had.
    private static List<State> states =  new ArrayList<State>();
    public static void main(String[] args){
        // ...
        // Do something
        // ...

        // Save the states
        states.add(new State("State 1","Value 1"))
        // Save another state
        states.add(new State("State 2","Value 2"))
        // The arraylist  now contains two states of the program.
    }

}

Hope it helps feel free to ask more questions.