Now, we'll look at how to ask Prolog queries in Java. Let's get to the Java code and see how this can be done.

Create a Java project in NetBeans, and type the following code:

import java.util.Map;
import jpl.Query;
import jpl.JPL;

public class ProrlogJava {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        String t1 = "consult('/Users/admin/Documents/NetBeansProjects/JPLwJava/family.pl')";
        System.out.println(t1 + " " + (Query.hasSolution(t1) ? "succeeded" : "failed"));
        String t2 = "child(sonny, vito)";
        System.out.println(t2 + " " + (Query.hasSolution(t2) ? "provable" : "not provable"));
        String t3 = "grandfather(vito, anthony)";
        System.out.println(t3 + " " + (Query.hasSolution(t3) ? "provable" : "not provable"));
    }

}

First, we have to call the JPL libraries by adding the jpl.jar file, as seen in the previous...