Queuing Nodes

[m4773rz]

I am trying to make a basic program for an Air traffic controller to land planes as the come in using nodes but i cant get the nodes to order properly as when i add a new one in it deletes the first node.

here is my code for the ordering of the nodes.

public void addPlane (PlaneNode planeIn) {

    if (start == null) {
        
        start = planeIn;
        end = planeIn;
        planeIn.setNext(null);
        planeIn.setPrevious(null);
        end = start;
        System.out.println("Thank you the plane has been added");
        System.out.println(planeIn.toString());
       } else {
//        if(end == start ){
//        // get the lastNode in queue
//        PlaneNode currentFirst = new PlaneNode ();
//        currentFirst = this.getEnd();
//        currentFirst.setNext(planeIn);
//        planeIn.setPrevious(currentFirst);
//        planeIn.setNext(null);
//        end = planeIn;
//        System.out.println(currentFirst.toString());
//        System.out.println(planeIn.toString());
//        System.out.println("Thank you the plane has been added1");
//             } else {
//          
       // if already nodes in queue
       // get the lastNode in queue
        PlaneNode currentLast = this.getEnd();
         //  current update 
        currentLast.setNext(planeIn);    
        // new plane update
        planeIn.setPrevious(currentLast);
        planeIn.setNext(null);

        // update queue's last value to point to new plane 
        this.end = planeIn;
        System.out.println("Thank you the plane has been added2");
        }
}

The add planeIn PlaneNode works fine. Any help would be great. Thanks
Matt

[Norm]

Could you provide some print out that shows what is happening?
What is the code you posted supposed to do?

How can it be tested? Can you provide a small class with a main method that calls the posted method and shows the problem?