java - 如何将代理移动到空间中

Question

我被困在我的家庭作业的一部分上。我不确定如何将代理运送到另一个空间。

向 Agent 类添加一个usePortal没有参数且返回类型为 void 的方法。此方法获取代理位置的门户，并检查它是否为空。

• 如果门户不为空，则让门户使用门户的传输方法传输代理。您将需要使用这个词来指代需要运输的代理。

• 如果门户为空，则不执行任何操作。

public class Agent {
    private Space _location;
    private String _name;

    public Space get_location() {
        return _location;
    }
    public void set_location(Space _location) {
        this._location = _location;
    }
    public String get_name() {
        return _name;
    }
    public void set_name(String _name) {
        this._name = _name;
    }

    public String toString(){
        return _name;
    }

    public String toStringLong(){
        return _name + " is in " + _location;
    }

    public void usePortal(){

        if(Portal.get_destination() == null){

        }else{

        }
    }
}


public class Portal {
    private static String _name;
    private static String _direction;
    private static Space _destination;


    public String get_name() {
        return _name;
    }

    public void set_name(String  _name) {
        Portal._name = _name;
    }

    public String get_direction() {
        return _direction;
    }

    public void set_direction(String _direction) {
        Portal._direction = _direction;
    }

    public static Space get_destination() {
        return _destination;
    }

    public  void set_destination(Space _destination) {
        Portal._destination = _destination;
    }


    public String toString(){
        return _name + " that goes " + _direction;
    }

    public String toStringLong(){
        return _name + " that goes " + _direction + " to " + _destination;  
    }

    public void transport(Agent student){
        student.set_location(_destination);
    }
}

public class Space {
    Portal p = new Portal();
    private String _name;
    private String _description;
    private Portal _portal;

    public String get_name() {
        return _name;
    }

    public void set_name(String _name) {
        this._name = _name;
    }

    public  String get_description() {
        return _description;

    }

    public void set_description(String _description) {
        this._description = _description;
    }

    public Portal get_portal() {
        return _portal;
    }

    public void set_portal(Portal _portal) {
        this._portal = _portal;
    }

    public String toString() {
        return _name;
    }

    public String toStringLong(){
        if (_portal != null){
        return _name + ": " + _description + " with a " + p.toStringLong();
        }
        return _name + ": " + _description;

    }
}

Answer 1

列表和数组是基于 Java 的零。第一个元素0不是1。