java - Access the pointer to an ArrayList?

I have an ArrayList in Java. Now, I want to access the pointer to the said list. This is so that I can make a variable out of the pointer and make operations using it. Any advise on how to do this?

What I want to do exactly is similar to making "list" below always point to the value of "someOtherList".

import java.util.ArrayList;
import java.util.List;

public class ListContainingObject {

    private List list;


    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

    public static void main(String args[]){
        ListContainingObject listContainingObject= new ListContainingObject();


        System.out.println(listContainingObject.getList());

        List someOtherList = new ArrayList();
        listContainingObject.setList(someOtherList);
        System.out.println(listContainingObject.getList());
        System.out.println(someOtherList);

        someOtherList.add("1");
        System.out.println(listContainingObject.getList());

        System.out.println(someOtherList);

        //I want the two below to have the same value
        someOtherList = new ArrayList();
        System.out.println(listContainingObject.getList());
        System.out.println(someOtherList);
    }
}

The seemingly appropriate workaround would be to call the setters again explicitly like below.

public class ListContainingObject {
    public void resetList(List toReset) {
        this.list = new ArrayList();
        toReset = this.list;
    }
}
listContainingObject.resetList(someOtherList);

But this would lead to another problem wherein I want solcowiab.getList() and listContainingObject.getList() below to always be the same, assuming that I don't have the source code for SomeOtherListContainingObjectWhichIsABlackBox.

import java.util.ArrayList;
import java.util.List;

    public class ListContainingObject {

    private List list;


    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

    public static void main(String args[]) {
        ListContainingObject listContainingObject = new ListContainingObject();

        SomeOtherListContainingObjectWhichIsABlackBox solcowiab = new SomeOtherListContainingObjectWhichIsABlackBox();
        List aNewList = new ArrayList();
        aNewList.add("1");
        solcowiab.setList(aNewList);
        listContainingObject.setList(solcowiab.getList());
        System.out.println(listContainingObject.getList());
        System.out.println(solcowiab.getList());

        //The two below will have the same value but
        //at some point "list" did not point to "someOtherList"

        solcowiab.aMethodThatSupposedlyWontCallSetList();
        listContainingObject.setList(solcowiab.getList());
        System.out.println(listContainingObject.getList());
        System.out.println(solcowiab.getList());
    }
}

class SomeOtherListContainingObjectWhichIsABlackBox {

    private List someOtherList;


    public List getList() {
        return someOtherList;
    }

    public void setList(List list) {
        this.someOtherList = list;
    }

    public void aMethodThatSupposedlyWontCallSetList() {

        //this one won't be observed by ListContainingObject
        setList(new ArrayList());
        getList().add("2");
        //do some other stuff

        //only this assignment will be controlled by ListContainingObject's main method
        setList(new ArrayList());
    }
}