DiEdge (Data Structures and Algorithms, and Client Programs from Algorithms by Robert Sedgewick and Kevin Wayne)

java.lang.Object
- dsa.DiEdge

```
class DiEdge
extends Object
```
An immutable data type to represent a weighted edge in an directed graph.

Constructor Summary

Constructors
Constructor Description

DiEdge(int v, int w, double weight)
Constructs a directed edge from vertex v to vertex w of the given weight.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`from()`	Returns the tail vertex of this directed edge.
`static void`	`main(String[] args)`	Unit tests the data type.
`int`	`to()`	Returns the head vertex of this directed edge.
`String`	`toString()`	Returns a string representation of this directed edge.
`double`	`weight()`	Returns the weight of this directed edge.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - DiEdge
```
public DiEdge(int v,
              int w,
              double weight)
```
    Constructs a directed edge from vertex v to vertex w of the given weight.
    
    Parameters:
    
    v - the tail vertex.
    
    w - the head vertex.
    
    weight - the weight.
- Method Detail
  - from
```
public int from()
```
    Returns the tail vertex of this directed edge.
    
    Returns:
    
    the tail vertex of this directed edge.
  - to
```
public int to()
```
    Returns the head vertex of this directed edge.
    
    Returns:
    
    the head vertex of this directed edge.
  - weight
```
public double weight()
```
    Returns the weight of this directed edge.
    
    Returns:
    
    the weight of this directed edge
  - toString
```
public String toString()
```
    Returns a string representation of this directed edge.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a string representation of this directed edge.
  - main
```
public static void main(String[] args)
```
    Unit tests the data type.
    
    Parameters:
    
    args - the command-line arguments.