Java ArrayList Class: How to get a method to refer to the class

Question

I am doing a school project in java and I am trying, in a method, to refer to the class.

import java.util.ArrayList;

public class NumberIndex extends ArrayList<Integer> {
  private int s;
  public NumberIndex (){
    super();
    s = 10; // would be better if it was class.size() 
            //but I don't know how to refer to the class
  }
  public NumberIndex (int x){
    super(x);
    s = x;
  }
  public void addWord(int num) {
    for(i = 0; i < s; i++)
      //trying to make it so that for each Integer in ArrayList,
      // if there exists an Integer that has the value num, nothing would
      //happen. Else creates new Integer and adds it to the List

So in order for me to finish this code, all I need is a way to reference the class object NumberIndex itself.

It appears you should be using a Set<Integer> which is a collection without duplicates and you would be better off not having an s value and it can only bring your grief. — Peter Lawrey
– Peter Lawrey, Commented Jan 17, 2016 at 22:11
Google the static keyword. You can reference the actual class object with NumberIndex.class. — kuhnroyal
– kuhnroyal, Commented Jan 17, 2016 at 22:14
@kuhnroyal I need to create an an object so I can't use static. However, I will look into NumberIndex.class Thanks for that tidbit — Dave
– Dave, Commented Jan 17, 2016 at 22:30

someone_somewhere · Accepted Answer · 2016-01-17 22:36:48Z

2

Since add word is a member function use this. that refers to the current NumberIndex object.

EDIT:

public class NumberIndex extends ArrayList<Integer> {

    public NumberIndex() {
        super(10);//setting the size of your NumberIndex object -> list size
    }

    public NumberIndex(int x) {
        super(x);//setting the size of your NumberIndex object -> list size
    }

    public void addWord(int num) {
        if(!this.contains(num)){//if the current NumberIndex object (list) does not contain num
            this.add(num);//to the current NumberIndex object (list) add num
        }
    }

}

edited Jan 17, 2016 at 22:36

answered Jan 17, 2016 at 22:13

someone_somewhere

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1 Comment

Dave Over a year ago

Would it be this.NumberIndex

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