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();

B b=new B();

b.f();

a.d=3;

}

}

按要求编写一个Java应用程序程序？

interface CanFly{

public void fly();}

class Plane implements CanFly{

public void fly(){

System.out.println(Plane fly);

}

}

class Bird implements CanFly{

public void fly(){

System.out.println(Bird fly);

}

}

public class Test{

public static void main(String[] args){

Plane p = new Plane();

Bird b = new Bird();

new Test().makeFly(p,b);

}

void makeFly(Plane p,Bird b){

p.fly();

b.fly();

}

}