我有以下JUNG库中Hypergraph实现的接口和类。我扩展了接口Hypergraph以创建接口ISimpleHypergraph,使其包含一些新方法,然后通过扩展类SetHypergraph并实现ISimpleHypergraph来创建新的类SimpleHypergraph。
我还创建了具有id和weight字段的自定义SimpleV和SimpleH类型。现在如何使用id字段在SimpleHypergraph中实现一些方法?在SimpleHypergraph内部,无法识别SimpleV和SimpleH。有什么建议或更好的方法吗?
请注意,接口Hypergraph和类SetHypergraph是JUNG libray的一部分。
public interface Hypergraph<V, H> {
// Other definitions
}
public interface ISimpleHypergraph<V, H> extends Hypergraph<V, H> {
H get(int id);
H get(Set<V> vSet);
// Other definitions
}
public class SetHypergraph<V, H> implements Hypergraph<V, H> {
protected Map<H, Set<V>> edges;
// Other fields
public SetHypergraph() {
edges = new HashMap<H, Set<V>>();
}
// Other methods
}
public class SimpleHypergraph<V, H> extends SetHypergraph<V, H> implements ISimpleHypergraph<V, H> {
public H get(int id) {
// How to use SimpleH.id and SimpleV.id here to get the
// searched Key entry from the Map<H, Set<V>> edges
}
public H get(Set<V> vSet) {
// How to use SimpleH.id and SimpleV.id here to get the
// searched Key entry from the Map<H, Set<V>> edges
}
}
public class SimpleV {
public int id;
public int weight;
public SimpleV(int id, int weight) {
this.id = id;
this.weight = weight;
}
// Other methods
}
public class SimpleH {
public int id;
public int weight;
public SimpleH(int id, int weight) {
this.id = id;
this.weight = weight;
}
// Other methods
}
最佳答案
public interface Hypergraph<V, H> {
// Other definitions
}
...
public class SetHypergraph<V, H> implements Hypergraph<V, H> {
protected Map<H, Set<V>> edges;
// Other fields
public SetHypergraph() {
edges = new HashMap<H, Set<V>>();
}
// Other methods
}
...
public interface SimpleHypergraph<V extends SimpleV, H extends SimpleH> extends Hypergraph<V, H> {
H get(int id);
H get(Set<V> vSet);
}
...
public class SimpleHypergraphImpl<V extends SimpleV, H extends SimpleH> extends SetHypergraph<V, H> implements SimpleHypergraph<V, H> {
public H get(int id) {
// your code
return null;
}
public H get(Set<V> vSet) {
// your code (V is at least SimpleV, so you can use its accessible properties/methods here
return null;
}
// example of usage
public static void main(String[] args) {
SimpleHypergraph<SimpleV, SimpleH> simpleHyperGraph = new SimpleHypergraphImpl<SimpleV, SimpleH>();
Set<SimpleV> set = new HashSet<SimpleV>();
set.add(new SimpleV(1,1));
set.add(new ComplicatedV(1000,1000));
SimpleH h = simpleHyperGraph.get(0);
h = simpleHyperGraph.get(set);
}
}
...
public class SimpleV {
private int id;
private int weight;
public SimpleV(int id, int weight) {
this.id = id;
this.weight = weight;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
// Other methods
}
...
public class SimpleH {
private int id;
private int weight;
public SimpleH(int id, int weight) {
this.id = id;
this.weight = weight;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
// Other methods
}
public class ComplicatedV extends SimpleV {
public ComplicatedV(int id, int weight) {
super(id, weight);
}
}
避免对类属性使用公共/受保护的访问修饰符。请改用getter和setter。
您可以使您的接口SimpleHypergraph通用,但我认为这在您的情况下是多余的。