protected

Order类

package com.atguigu.java1;

public class Order {
    public int numberPublic;
    int numberDefault;
    protected int numberProtected;
    private int numberPrivate;
    
    public void methodPublic() {
        System.out.println("methodPublic");
    }
    
    void methodDefault() {
        System.out.println("methodDefault");
    }
    
    protected void methodProtected() {
        System.out.println("methodProtected");
    }
    
    private void methodPrivate() {
        System.out.println("methodPrivate");
    }
    
}

SubOrder类（Order不同包下的子类）

package com.atguigu.java2;

import com.atguigu.java1.*;

public class SubOrder extends Order{
    public static void main(String[] args) {
        SubOrder s1 = new SubOrder();
        s1.numberPublic = 1;
        s1.numberProtected = 2;     //不同包下的子类可以调用
        //s1.numberDefault = 3;     报错：The field Order.numberDefault is not visible
        //s1.numberPrivate = 4;     报错：The field Order.numberDefault is not visible
        
        s1.methodPublic();
        s1.methodProtected();
        //s1.methodDefault();       报错：The method methodDefault() from the type Order is not visible
        //s1.methodPrivate();       报错：The method methodDefault() from the type Order is not visible
    } 
}