java 子类访问父类私有成员_子类为什么可以访问父类的私有方法

class PrivateOverride {

private void f() {

System.out.println("private f()");

}

public void hello(){

this.f();

this.bar();

}

protected void bar(){

System.out.print("pri bar");

}

}

class Derived extends PrivateOverride {

public void f() {

System.out.println("public f()");

}

public void bar(){

System.out.print("deri bar");

}

}

class Test4{

public static void main(String[] args) {

Derived po = new Derived();

po.hello();

}

}

输出:

private f()

deri bar

为什么呢