我在Java中遇到事件有问题。我有两个玉石班：
头等
import jade.core.Agent;
import jade.core.behaviours.*;
import jade.lang.acl.ACLMessage;
import jade.lang.acl.MessageTemplate;
import jade.domain.DFService;
import jade.domain.FIPAException;
import jade.domain.FIPAAgentManagement.DFAgentDescription;
import jade.domain.FIPAAgentManagement.ServiceDescription;
import java.util.*;
public class BookSellerAgent extends Agent {
// The catalogue of books for sale (maps the title of a book to its price)
private Hashtable catalogue;
// The GUI by means of which the user can add books in the catalogue
private BookSellerGui myGui;
// Put agent initializations here
protected void setup() {
// Create the catalogue
catalogue = new Hashtable();
// Create and show the GUI
myGui = new BookSellerGui(this);
myGui.showGui();
if(myGui.var==true)
System.out.println("it is work");
// Register the book-selling service in the yellow pages
DFAgentDescription dfd = new DFAgentDescription();
dfd.setName(getAID());
ServiceDescription sd = new ServiceDescription();
sd.setType("book-selling");
sd.setName("JADE-book-trading");
dfd.addServices(sd);
try {
DFService.register(this, dfd);
}
catch (FIPAException fe) {
fe.printStackTrace();
}
// Add the behaviour serving queries from buyer agents
addBehaviour(new OfferRequestsServer());
// Add the behaviour serving purchase orders from buyer agents
addBehaviour(new PurchaseOrdersServer());
}
// Put agent clean-up operations here
protected void takeDown() {
// Deregister from the yellow pages
try {
DFService.deregister(this);
}
catch (FIPAException fe) {
fe.printStackTrace();
}
// Close the GUI
myGui.dispose();
// Printout a dismissal message
System.out.println("Seller-agent "+getAID().getName()+" terminating.");
}
/**
This is invoked by the GUI when the user adds a new book for sale
*/
public void updateCatalogue(final String title, final int price) {
addBehaviour(new OneShotBehaviour() {
public void action() {
catalogue.put(title, new Integer(price));
System.out.println(title+" inserted into catalogue. Price = "+price);
}
} );
}
/**
Inner class OfferRequestsServer.
This is the behaviour used by Book-seller agents to serve incoming requests
for offer from buyer agents.
If the requested book is in the local catalogue the seller agent replies
with a PROPOSE message specifying the price. Otherwise a REFUSE message is
sent back.
*/
private class OfferRequestsServer extends CyclicBehaviour {
public void action() {
MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.CFP);
ACLMessage msg = myAgent.receive(mt);
if (msg != null) {
// CFP Message received. Process it
String title = msg.getContent();
ACLMessage reply = msg.createReply();
Integer price = (Integer) catalogue.get(title);
if (price != null) {
// The requested book is available for sale. Reply with the price
reply.setPerformative(ACLMessage.PROPOSE);
reply.setContent(String.valueOf(price.intValue()));
}
else {
// The requested book is NOT available for sale.
reply.setPerformative(ACLMessage.REFUSE);
reply.setContent("not-available");
}
myAgent.send(reply);
}
else {
block();
}
}
} // End of inner class OfferRequestsServer
/**
Inner class PurchaseOrdersServer.
This is the behaviour used by Book-seller agents to serve incoming
offer acceptances (i.e. purchase orders) from buyer agents.
The seller agent removes the purchased book from its catalogue
and replies with an INFORM message to notify the buyer that the
purchase has been sucesfully completed.
*/
private class PurchaseOrdersServer extends CyclicBehaviour {
public void action() {
MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.ACCEPT_PROPOSAL);
ACLMessage msg = myAgent.receive(mt);
if (msg != null) {
// ACCEPT_PROPOSAL Message received. Process it
String title = msg.getContent();
ACLMessage reply = msg.createReply();
Integer price = (Integer) catalogue.remove(title);
if (price != null) {
reply.setPerformative(ACLMessage.INFORM);
System.out.println(title+" sold to agent "+msg.getSender().getName());
}
else {
// The requested book has been sold to another buyer in the meanwhile .
reply.setPerformative(ACLMessage.FAILURE);
reply.setContent("not-available");
}
myAgent.send(reply);
}
else {
block();
}
}
} // End of inner class OfferRequestsServer
}
第二课
import jade.core.AID;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
@author Giovanni Caire - TILAB
*/
class BookSellerGui extends JFrame {
private BookSellerAgent myAgent;
private JTextField titleField, priceField;
boolean var;
BookSellerGui(BookSellerAgent a) {
super(a.getLocalName());
myAgent = a;
JPanel p = new JPanel();
p.setLayout(new GridLayout(2, 2));
p.add(new JLabel("Book title:"));
titleField = new JTextField(15);
p.add(titleField);
p.add(new JLabel("Price:"));
priceField = new JTextField(15);
p.add(priceField);
getContentPane().add(p, BorderLayout.CENTER);
JButton addButton = new JButton("Add");
addButton.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent ev) {
try {
String title = titleField.getText().trim();
String price = priceField.getText().trim();
myAgent.updateCatalogue(title, Integer.parseInt(price));
titleField.setText("");
priceField.setText("");
var=true;
}
catch (Exception e) {
JOptionPane.showMessageDialog(BookSellerGui.this, "Invalid values. "+e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
} );
p = new JPanel();
p.add(addButton);
getContentPane().add(p, BorderLayout.SOUTH);
// Make the agent terminate when the user closes
// the GUI using the button on the upper right corner
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
myAgent.doDelete();
}
} );
setResizable(false);
}
public void showGui() {
pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int centerX = (int)screenSize.getWidth() / 2;
int centerY = (int)screenSize.getHeight() / 2;
setLocation(centerX - getWidth() / 2, centerY - getHeight() / 2);
super.setVisible(true);
}
}
问题是，当我点击添加gui时，我想查看“这是工作”。为什么它不起作用？
答案 0 :(得分：0)
我不知道Jade但是在你的代码中，当点击添加按钮时var被设置为true。如果您在第二个班级的System.out.println("something")行后面加var=true，您会看到单击按钮时按预期发生。
如果您更改第一个类：
if(myGui.var==true)
System.out.println("it is work");
else
System.out.println("Add button has not been pressed yet");
在测试该条件时，您还会看到var仍为false，因为您还没有时间单击“添加”按钮。
处理这个问题的正确方法是让第一个类听取第二个类，以便在单击按钮时收到警报并在发生这种情况时运行适当的类。