Dijkstra’s algorithm: Can you give an example of a graph that can be traversed using Dijkstra’s algorithm and explain how to implement it in Java?
Sure! Here's an example of a directed, weighted, unweighted undirected graph (digraph) with edges representing the distance between two nodes.

The vertices are labeled A, B, C, and D. The weight of each edge is represented by its length. In this case, we have set the weights as follows:

    A - 1
    B 0
    C 2
    D 3

And here's an implementation of Dijkstra's algorithm in Java:
```java
public class Graph {
  private int[] dist; // stores distances from all vertices to all other vertices
  private Vertex source = null; // starting vertex for search
  private boolean done = false; // whether or not the search has finished

  // constructor
  Graph(int[] dist){
      this.dist = new int[V+1];
      for(int i=0;i