java - 实例化新内部类时，内部类不是公共(public)错误

Question

我有这门课

package com.rafael;

public class Vehicle {

    public class InnerVehicle {
        InnerVehicle() {
            System.out.println("This is InnerVehicle");
        }
    }
}

并在主函数中

import com.rafael.Vehicle;

public class VehicleTest {
    public static void main(String[] args) {
        Vehicle v = new Vehicle();
        Vehicle.InnerVehicle iv = v.new InnerVehicle();
    }
}

但这总是给我带来错误:

java: InnerVehicle() is not public in com.rafael.Vehicle.InnerVehicle; cannot be accessed from outside package

Answer 1

创建内部类public static

否则，您需要外部类的一个对象来创建内部类的实例，如 Tim Biegeleisen 已经提到的

并创建内部类的构造函数 public也是

类似于:

public class Vehicle {    
    public static class InnerVehicle {
        public InnerVehicle() {
            System.out.println("This is InnerVehicle");
        }
    }
}