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我已經定義了一個自定義邊和頂點類型以用於無向稀疏圖。問題是圖形添加了我不想要的多條邊。例如，考慮下面的代碼：JUNG - 自定義邊和頂點問題
UndirectedSparseGraph<Vertex, Edge> graphX = new UndirectedSparseGraph<Vertex, Edge>();
graphX.addEdge(new Edge("1#2"), new Vertex("1"), new Vertex("2"));
graphX.addEdge(new Edge("1#2"), new Vertex("1"), new Vertex("2"));
graphX.addEdge(new Edge("2#1"), new Vertex("2"), new Vertex("1"));
graphX.addEdge(new Edge("1#3"), new Vertex("1"), new Vertex("3"));
graphX.addEdge(new Edge("1#4"), new Vertex("1"), new Vertex("4"));
我有意加入的兩個相似的邊緣（第一的）。我已經爲我創建的兩個類（即Edge和Vertex）重寫了一個equals方法，但是該圖假定邊的頂點是不同的，並添加了所有這些邊。 下面是輸出：
Vertices:1,4,1,1,2,1,1,2,2,3
Edges:1#3[1,3] 1#4[1,4] 1#2[1,2] 1#2[1,2] 2#1[2,1]
那麼，我究竟做錯了什麼？
PS。 FYI這裏是我創建的類：
public class Vertex {
private String id;
//More info in the future
public Vertex(String id){
this.id = id;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Override
public boolean equals(Object obj){
return ((Vertex) obj).id.equals(this.id);
}
@Override
public String toString(){
return this.id;
}
}
public class Edge {
private String id;
private double weight;
public Edge(String id, double weight){
this.id = id;
this.weight = weight;
}
public Edge(String id){
this.id = id;
this.weight = -1;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
@Override
public boolean equals(Object obj){
return ((Edge) obj).id.equals(this.id);
}
@Override
public String toString(){
return this.id;
}
}