java 包和访问权限 小练习1

package pack1;

public class A {

    private int i;
    float f;
    public double d;
}

package pack1;

public class B {
    public static void main(String[] args) {

        A a = new A();
        a.f=2;
        a.d=3;
    }

}

package pack2;

public class B {

    public void f()
    {
        System.out.println("执行pack2包中的类B的方法f");
    }
}

package pack2;

import pack1.A;

public class C {
    public static void main(String[] args) {

        A a = new A();
        a.d=3;
        B b = new B();
    }

}