线程“主”中的异常java.lang.IllegalAccessError

Question

我是Java的新手，我能够编译两个Java文件（即BicycleRegistration.java和Bicycle.java。

但是当我尝试运行BicycleRegistration.java时，出现以下错误

Exception in thread "main" java.lang.IllegalAccessError: failed to access class Bicycle from class BicycleRegistration (Bicycle is in unnamed module of loader 'app'; BicycleRegistration is in unnamed module of loader com.sun.tools.javac.launcher.Main$MemoryClassLoader @2eda0940)
    at BicycleRegistration.main(BicycleRegistration.java:8)

保存在BicycleRegistration.java中：

class BicycleRegistration{

public static void main(String[] args){

    Bicycle bike1, bike2;
    String  owner1, owner2;

    bike1 = new Bicycle(); // Create and assign values to bike1
    bike1.setOwnerName("Adam Smith");        

    bike2 = new Bicycle(); // Create and assign values to bike2
    bike2.setOwnerName("Ben Jones");

    // output the information
    owner1 = bike1.getOwnerName();
    owner2 = bike2.getOwnerName();

    System.out.print(owner1 + "owns a bicycle.");
    System.out.print(owner2 + "also owns a bicycle");
}
}

保存在Bicycle.java中：

class Bicycle{

//Data member
private String ownerName;

//Constructor: Initialise the data member
public Bicycle(){

    ownerName = "Unassigned";
}

//Returns the name of this bicycle's owner
public String getOwnerName(){

    return ownerName; 
}

//Assigns the name of this bicycle owner
public void setOwnerName(String name){
    ownerName = name; 
}
}