从一个类到另一个Java使用变量

Question

I have a java we application that is working with velocity. I get two variables in the first page via url that I extract using ureq.getParameter() method. One of the other classes that has a velocity container and I need to send one of the variables from the url to this velocity container. I tried creating an instance of the first class in the second class and using getVariable name method to do that but it did not work. Can someone tell me how I can do this?

Class 1:

package org.olat.dispatcher;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.olat.core.gui.UserRequest;

public class RemoteLoginformDispatcher implements Dispatcher {

    private static final String PARAM_newUrl = "ret";
    private static String newURL;

    @Override
    public void execute(
            final HttpServletRequest request, 
            final HttpServletResponse response, 
            final String uriPrefix) {

        UserRequest ureq = null;

        try {
            ureq = new UserRequest(uriPrefix, request, response);
            newURL = ureq.getParameter(PARAM_newUrl);
        } catch () {
        }

    }

    public String getURL(){
        return newURL;
    }

}

Class 2:

public class BaseChiefController extends DefaultChiefController implements ContentableChiefController {
    //Velocity container mainvc created here. It interacts with a html file. Removed the code that would not really matter

    //mainvc.contextPut("newURL", "something");
    //The below statement works. When I try with something, the something appears in the html file.
    mainvc.contextPut("newURL", myLogin.getURL());      

}

Answer 1

To create an instance of another class, simply create a "public CLASSNAME" method, and inside define all class variables with the "this" modfier. Then, call out the function you wish to use from that method, and when you want to use the class, just do "new CLASSNAME(args);"

Although, I am not really sure I am understanding your question.

Maybe this is your answer. You can use variables from one class to another class by making the variable static, then doing "CLASSNAME.VARIABLENAME = WHATEVER".

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EDITED:

Okay, so as far as I can tell, you are using a method to return a static value from the class, which is much slower than just doing "newURL", RemoteLoginformDispatcher.newURL);. Why not try this, as it is probably faster, and it should always work if newURL is defined. Otherwise, you have a different problem, and newURL is not being defined. If this is the case, try printing the caught Exception.