Adding vertices to graph using ArrayList

Question

I am trying to add create two ArrayList of vertices (setA, setB) which will store the stores for comparing them late how ever I am unable to add vertices to the arraylist.

here is the code

import java.util.*;


public class BipartiteGraph<Vertex> {

    private String strName;
    ArrayList<Vertex>[] vertexList;

    public BipartiteGraph(){

        vertexList = new ArrayList[2];
        vertexList[0] = new ArrayList<Vertex>();
        vertexList[1] = new ArrayList<Vertex>();
        Scanner vertexInput = new Scanner(System.in);
        int vertex;
        vertex = vertexInput.nextInt();
        for(int i = 0; i < 10; i++){
            vertexList[0].add(vertexInput.nextInt());
        }
    }
}

Also if someone could guide me if I am in the right direction.

You are trying to add an int to an ArrayList that contains Vertexes. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Nov 24, 2013 at 21:24

lejlot · Accepted Answer · 2013-11-24 21:24:29Z

1

You are trying to add int variable into the container of Vertex objects. Assuming, that your Vertex has a constructor accepting int you should rather use:

vertexList[0].add(new Vertex(vertexInput.nextInt()));

answered Nov 24, 2013 at 21:24

lejlot

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2 Comments

Maddy Over a year ago

how can I instantiate the vertex here?

lejlot Over a year ago

simply define the constructor accepting int, like: public Vertex(int v){ .... }`

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