Stack overflow error in main instantiating two objects?

Question

Hello I'm still new to Java and OOP and am having issues trying to get my code to compile. I understand the issue with my code is the instantiation of the same object twice however I'm not sure how I can work around that to compile my code.

package week2;

import java.util.*

public class aBug {

    aBug theBug = new aBug();
    String Inspecies, Inname;
    int Inx, Iny, Inenergy, Inid;
    char Insymbol;

    Scanner scan = new Scanner(System.in);
    aWorld newWorld = new aWorld();

    public static void main(String[] args) {
        aBug theBug = new aBug();


        theBug.mainMenu();

    }

    public void mainMenu() {

        int choice;
        do {

            System.out.print("1\t Create bug\n");
            System.out.print("2\t Enter world\n");
            System.out.print("3\t Quit\n");
            choice = scan.nextInt();
            switch (choice) {

            case 1:
                bugInit();
                break;

            case 2:
                System.out.println();
                newWorld.mapInit(theBug.Inx, theBug.Iny, theBug.Insymbol);
                System.out.println();
                break;
            }
        } while (choice != 3);
    }

    public void bugInit() {
        String species, name;
        int x, y, energy, id;
        char symbol;



        System.out.print("Species: ");
        species = scan.nextLine();

        System.out.print("Name: ");
        name = scan.nextLine();

        System.out.print("X position: ");
        x = scan.nextInt();

        System.out.print("Y position: ");
        y = scan.nextInt();

        System.out.print("Energy: ");
        energy = scan.nextInt();

        System.out.print("ID: ");
        id = scan.nextInt();

        theBug.Insymbol = 'b';
        theBug.Inspecies = species;
        theBug.Inname = name;
        theBug.Inx = x;
        theBug.Iny = y;
        theBug.Inenergy = energy;
        theBug.Inid = id;

        System.out
                .format("\nThe bug is of the species %s, called %s, "
                        + "with positions %d & %d, with energy amount: %d, and %d as it's id number\n\n",
                        theBug.Inspecies, theBug.Inname, theBug.Inx, theBug.Iny,
                        theBug.Inenergy, theBug.Inid);

    }


}

Exception in thread "main" java.lang.StackOverflowError at week2.aBug.<init>(aBug.java:6) at week2.aBug.<init>(aBug.java:6) at week2.aBug.<init>(aBug.java:6) at week2.aBug.<init>(aBug.java:6) at week2.aBug.<init>(aBug.java:6) at week2.aBug.<init>(aBug.java:6) — Patryk
– Patryk, Commented Oct 19, 2014 at 18:14

luk32 · Accepted Answer · 2014-10-19 18:23:50Z

1

In the constructor you have:

public class aBug {
    aBug theBug = new aBug();
...
}

So while creating an instance of aBug (for example in your main) you call new aBug(), which calls the constructor again recurrently with out end overflowing the stack.

I am not sure why do you think you need to create an instance of the object within itself. So it's hard to give any hints. If I guess correctly, you merged the idea of aBug and "main program" in one class. You should split it and put aBug internal stuff in its own class.

edited Oct 19, 2014 at 18:23

answered Oct 19, 2014 at 18:18

luk32

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