为什么JGraphT中的isEulerian（）对我来说是一个未定义的符号？

Question

package org.jgrapht.alg; 
import java.util.List;
import org.jgrapht.alg.*;
import org.jgrapht.*;
import org.jgrapht.graph.*;

public class testowa{

    public static void main(String args[]) {
        UndirectedGraph<String, DefaultEdge> stringGraph = createStringGraph();
        // note undirected edges are printed as: {<v1>,<v2>}
        System.out.println(stringGraph.toString());
        boolean check = isEulerian(stringGraph);
    }



    private static UndirectedGraph<String, DefaultEdge> createStringGraph()
    {
        UndirectedGraph<String, DefaultEdge> g =
            new SimpleGraph<String, DefaultEdge>(DefaultEdge.class);

        String v1 = "v1";
        String v2 = "v2";
        String v3 = "v3";
        String v4 = "v4";

        // add the vertices
        g.addVertex(v1);
        g.addVertex(v2);
        g.addVertex(v3);
        g.addVertex(v4);

        // add edges to create a circuit
        g.addEdge(v1, v2);
        g.addEdge(v2, v3);
        g.addEdge(v3, v4);
        g.addEdge(v4, v1);

        return g;
    }
}

我不断收到的错误：

testowa.java:14: error: cannot find symbol
        boolean check = isEulerian(stringGraph);
                        ^
  symbol:   method isEulerian(UndirectedGraph<String,DefaultEdge>)
  location: class testowa
1 error

Answer 1

您尚未定义任何名为iseulerian()；的方法

根据文档文档

你必须传递一些参数。