《疯狂Java讲义》——闭包和回调

//教师接口
interface Teachable
{
void work();//work方法
}

//程序员类
class Programmer
{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Programmer(){}
public Programmer(String name)
{
this.name = name;
}
//work方法
public void work()
{
System.out.println(name + "programming");
}
}

//Programer类的子类
class TeachableProgrammer extends Programmer
{
public TeachableProgrammer(){}
public TeachableProgrammer(String name)
{
super(name);//调用其父类含参的构造方法
}
//私有的teach方法
private void teach()
{
System.out.println("teaching");
}
//非静态内部类实现教师接口
private class Closure implements Teachable
{
//实现其work方法
public void work()
{
teach();//调用外部类的私有的teach方法
}
}
//返回内部类的实例
public Teachable getCallbachReference()
{
return new Closure();
}
}

public class Test{

public static void main(String[] args) {
TeachableProgrammer tp = new TeachableProgrammer("Jane");
tp.work();//调用继承自父类的work方法
//表面上调用的是Closure类的work方法
//实际上调用的是TeachableProgrammer的teach方法
tp.getCallbachReference().work();
}
}