Weight_Adj_List.java

import java.util.ArrayList;

public class Weight_Adj_List {
  //Edge class
    static class Edge {
        int src;    
        int dest; 
        int wt;
   
        public Edge(int s, int d, int w){
            this.src = s;
            this.dest = d;
            this.wt = w;
        }
    }

    public static void createGraph(ArrayList<Edge> graph[]){
        for (int i = 0; i < graph.length; i++) {
            graph[i] = new ArrayList<Edge>(); 
                                          
        }
        graph[0].add(new Edge(0,2,2));

        graph[1].add(new Edge(1,2,10));
        graph[1].add(new Edge(1,3,10));
        
        graph[2].add(new Edge(2,0,2));
        graph[2].add(new Edge(2,1,10));
        graph[2].add(new Edge(2,3,-1));

        graph[3].add(new Edge(3,1,0));
        graph[3].add(new Edge(3,2,-1));

    }
    public static void main(String[] args) {

        int V = 4;

        ArrayList<Edge> graph[] = new ArrayList[V];
        createGraph(graph);
   
        for (int i = 0; i < graph[2].size(); i++) {
            Edge e = graph[2].get(i);
            System.out.println(+e.dest+ " "+e.wt);
        }
    }
} 
/*
2's neibers

0 2
1 10
3 -1
 */