3 接口 interface 内部类

package love;



public interface sport {
void run();
void jump();

}
abstract class athlete implements sport
{
public void run()
{
System.out.println("runner");
}
public void jump()
{
System.out.println("jumper");
}
public static void main(String[] args)
{
athlete zhangsan=new love();//love 还得定义一个class不懂为什么
zhangsan.run();
zhangsan.jump();

}
}
接口中都是 public


=======================================================
内部类


public interface animal {
   void eat();
   void sleep();

}
class zoo
{
class tiger implements animal
{
public void eat()
{
System.out.println("tiger eat");

}
public void sleep() {
System.out.println("tiger sleep");

}
}
/*aniaml getanimal()
{
return new tiger();
}*/
animal getanimal()
{
return new animal()
//class aa
{
public void eat() {
System.out.println("animal eat");

}
public void sleep() {
System.out.println("animal sleep");

}

};//分号很重要啊不要忘了
}
}
class test
{
public static void main(String[] args) {
zoo z=new zoo();
animal an=z.getanimal();
an.eat();
an.sleep();

}
}
=========================


public interface machine {
void run();

}
class person
{
void run()
{
System.out.println("run");
}
}
class Robot extends person
{
  // @SuppressWarnings("unused")
private class machineheart implements machine
{
public void run() {
// TODO Auto-generated method stub
System.out.println("heart run");
}
machine getmachine()
{
return new machineheart();
}
}
}
class test
{
public static void main(String[] args)
{
Robot robot=new Robot();
machine m=robot.getmachine();
m.run();
robot.run();
}
}//为什么不行呢？？？？？