Java中如何正确地将包含数组的对象传递给方法并访问其内部数组

public class Route {
   private int id;
   private String name;

   public Route() {}

   public Route(int id, String name) {
      this.id = id;
      this.name = name;
   }

   // 需要getter方法来访问id
   public int getId() {
       return id;
   }

   public void setName(String name) {
       this.name = name;
   }
}

public class ControllerRoute {
   Route[] routes; // 内部的Route数组

   public ControllerRoute(int size) {
      routes = new Route[size];
   }
}

import javax.swing.JOptionPane;

public class Menu {
    private ControllerRoute cr = new ControllerRoute(100);
    UpdateAndDelete ud = new UpdateAndDelete();

    public void updateRoute() {
        int id;
        id = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter an Id"));
        ud.updateRoutes(id, cr); // 将cr对象本身传递给方法
    }
}

import javax.swing.JOptionPane;

public class UpdateAndDelete {

    public Route updateRoutes(int id, ControllerRoute cr) { // 参数类型是ControllerRoute
        int pos = -1;
        String nwname;
        // 尝试将cr作为数组使用，导致编译错误
        for (int i = 0; i < cr.length; i++) { // 错误：cannot find symbol (cr.length)
            if (id == cr[i].getId()) {        // 错误：array required, but ControllerRoute found
                pos = i;
            }
        }
        // ... 后续更新逻辑
        return null;
    }
}

public class ControllerRoute {
   Route[] routes;

   public ControllerRoute(int size) {
      routes = new Route[size];
   }

   // 新增的getter方法，用于获取内部的routes数组
   public Route[] getRoutes() {
       return routes;
   }

   // 可以在这里添加其他管理routes数组的方法，例如addRoute, deleteRoute等
}

import javax.swing.JOptionPane;

public class Menu {
    private ControllerRoute cr = new ControllerRoute(100);
    UpdateAndDelete ud = new UpdateAndDelete();

    public void updateRoute() {
        int id;
        id = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter an Id"));
        // 传递通过getter方法获取到的Route[]数组
        ud.updateRoutes(id, cr.getRoutes());
    }
}

import javax.swing.JOptionPane;

public class UpdateAndDelete {

    // 参数类型现在是Route[]，可以直接进行数组操作
    public Route updateRoutes(int id, Route[] routesArray) {
        int pos = -1;
        String nwname = ""; // 初始化，避免潜在的未初始化使用错误

        // 现在可以正确地使用routesArray.length和routesArray[i]
        for (int i = 0; i < routesArray.length; i++) {
            // 需要确保routesArray[i]不为null，且Route类有getId()方法
            if (routesArray[i] != null && id == routesArray[i].getId()) {
                pos = i;
                break; // 找到后即可退出循环
            }
        }

        if (pos != -1) {
            // 假设我们在这里进行更新操作
            nwname = JOptionPane.showInputDialog(null, "Enter new name for ID " + id);
            if (routesArray[pos] != null) {
                routesArray[pos].setName(nwname); // 更新Route对象的name属性
                JOptionPane.showMessageDialog(null, "Route ID " + id + " updated successfully.");
                return routesArray[pos];
            }
        } else {
            JOptionPane.showMessageDialog(null, "Route with ID " + id + " not found.");
        }
        return null;
    }
}