跨包之间访问protected类型的问题

2001-08-23 06:00:37 232 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

//file：PackagedClass.java
package c05;

public class PackagedClass{
public PackagedClass(){
System.out.println("Creating a packaged class");
}

protected void f() {
System.out.println("protedted access identifier");
}
}

//file:Foreign.java
package c05.foreign;

import c05.*;

public class Foreign{
public static void main(String[] args) {
//PackagedClass pc = new PackagedClass();
//pc.f();
PackagedClassSub pcs = new PackagedClassSub();
pcs.f();
}
}

class PackagedClassSub extends PackagedClass {
public void test()
{
f();
}

}

编译时，pcs.f()出错，说：No method matching f() found in class c05.foreign.PackagedClassSub.
但是据我所知：子类（这里是PackagedClassSub)可以跨包访问父类（这里是PackagedClass)的protected方法f()，thinking in java书上也是这么说的，为什么会编译出错呢？？

...全文