content: /*************************************************************************
   *  Compilation:  javac DirectedEdge.java
   *  Execution:    java DirectedEdge
   *
   *  Immutable weighted directed edge.
   *
   *************************************************************************/
  
  /**
   *  The <tt>DirectedEdge</tt> class represents a weighted edge in an directed graph.
   *  <p>
   *  For additional documentation, see <a href="http://algs4.cs.princeton.edu/44sp">Section 4.4</a> of
   *  <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne.
   */
  
  public class DirectedEdge { 
      private final int v;
      private final int w;
      private final double weight;
  
     /**
       * Create a directed edge from v to w with given weight.
       */
      public DirectedEdge(int v, int w, double weight) {
          this.v = v;
          this.w = w;
          this.weight = weight;
      }
  
     /**
       * Return the vertex where this edge begins.
       */
      public int from() {
          return v;
      }
  
     /**
       * Return the vertex where this edge ends.
       */
      public int to() {
          return w;
      }
  
     /**
       * Return the weight of this edge.
       */
      public double weight() { return weight; }
  
     /**
       * Return a string representation of this edge.
       */
      public String toString() {
          return v + "->" + w + " " + String.format("%5.2f", weight);
      }
  
     /**
       * Test client.
       */
      public static void main(String[] args) {
          DirectedEdge e = new DirectedEdge(12, 23, 3.14);
          StdOut.println(e);
      }
  }
  