Extending DirectedSparseEdge

[Anonymous]

When trying to extend DirectedSparseEdge I get the following error:

jungtest.java:6: cannot resolve symbol
symbol  : constructor DirectedSparseEdge ()
location: class edu.uci.ics.jung.graph.impl.DirectedSparseEdge
    public jungtest(DirectedSparseVertex from, DirectedSparseVertex to) {
                                                                        ^
The file is simply contains:
import edu.uci.ics.jung.graph.impl.DirectedSparseEdge;
import edu.uci.ics.jung.graph.impl.DirectedSparseVertex;

public class jungtest extends DirectedSparseEdge {
   
    public jungtest(DirectedSparseVertex from, DirectedSparseVertex to) {
       
    }
}

[Anonymous]

Sorry about the text formatting. The Carot marking the error is under the first curly bracket in the constructor

[D. Fisher]

Joshua,

By default, in Java, a constructor starts off by calling the constructor of its superclass. Thus, your function is essentially

public jungtest ( ... ) {
   super();
}

As the system is pointing out, that's not the appropriate constructor for the superclass. Try, instead,

public jungtest(DirectedSparseVertex from, DirectedSparseVertex to) {
   super( from, to );
}

For a good example, look at the source code for BipartiteGraph, which extends UndirectedSparseGraph.