DirectedEdge

java.lang.Object
- edu.princeton.cs.algs4.DirectedEdge

```
public class DirectedEdge
extends java.lang.Object
```
The DirectedEdge class represents a weighted edge in an EdgeWeightedDigraph. Each edge consists of two integers (naming the two vertices) and a real-value weight. The data type provides methods for accessing the two endpoints of the directed edge and the weight.
For additional documentation, see Section 4.4 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

构造器概要

构造器
构造器说明

DirectedEdge(int v, int w, double weight)
Initializes a directed edge from vertex v to vertex w with the given weight.

方法概要

修饰符和类型	方法	说明
`int`	`from()`	Returns the tail vertex of the directed edge.
`static void`	`main(java.lang.String[] args)`	Unit tests the `DirectedEdge` data type.
`int`	`to()`	Returns the head vertex of the directed edge.
`java.lang.String`	`toString()`	Returns a string representation of the directed edge.
`double`	`weight()`	Returns the weight of the directed edge.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - DirectedEdge
```
public DirectedEdge(int v,
                    int w,
                    double weight)
```
    Initializes a directed edge from vertex v to vertex w with the given weight.
    
    参数:
    
    v - the tail vertex
    
    w - the head vertex
    
    weight - the weight of the directed edge
    
    抛出:
    
    java.lang.IllegalArgumentException - if either v or w is a negative integer
    
    java.lang.IllegalArgumentException - if weight is NaN
- 方法详细资料
  - from
```
public int from()
```
    Returns the tail vertex of the directed edge.
    
    返回:
    
    the tail vertex of the directed edge
  - to
```
public int to()
```
    Returns the head vertex of the directed edge.
    
    返回:
    
    the head vertex of the directed edge
  - weight
```
public double weight()
```
    Returns the weight of the directed edge.
    
    返回:
    
    the weight of the directed edge
  - toString
```
public java.lang.String toString()
```
    Returns a string representation of the directed edge.
    
    覆盖:
    
    toString 在类中 java.lang.Object
    
    返回:
    
    a string representation of the directed edge
  - main
```
public static void main(java.lang.String[] args)
```
    Unit tests the DirectedEdge data type.
    
    参数:
    
    args - the command-line arguments