JAVA回调机制(CallBack)

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java 回调机制基本可以描述为： 一个类A调用另一个类B的方法，调用的同时传入必要参数及A的对象； 在B拿到其他参数并处理完后，可以把原参数和结果或其他中间值当做参数， 通过A的对象调用A的方法，这个方法我们称之为回调方法。

回调机制模板：
//实现回调的接口类 public
interface doJob{     public
void fillBlank(int
a, int b, int result);} //计算器公共类 public
class SuperCalculator{    public
void add(int
a, int b, doJob  customer)    {        int
result = a + b;        customer.fillBlank(a, b, result);    }} //学生使用计算器 public
class Student{    private
String name = null;     public
Student(String name)    {        // TODO Auto-generated constructor stub        this.name = name;    }     public
void setName(String name)    {        this.name = name;    }     public
class doHomeWork implements doJob    {         @Override        public
void fillBlank(int
a, int b, int result)        {            // TODO Auto-generated method stub            System.out.println(name + "求助小红计算:" + a + " + " + b + " = " + result);        }     }     public
void callHelp (int
a, int b)    {        new
SuperCalculator().add(a, b, new doHomeWork());    }}//商家使用计算器public
class Seller{    private
String name = null;     public
Seller(String name)    {        // TODO Auto-generated constructor stub        this.name = name;    }     public
void setName(String name)    {        this.name = name;    }     public
class doHomeWork implements doJob    {         @Override        public
void fillBlank(int
a, int b, int result)        {            // TODO Auto-generated method stub            System.out.println(name + "求助小红算账:" + a + " + " + b + " = " + result + "元");        }     }     public
void callHelp (int
a, int b)    {        new
SuperCalculator().add(a, b, new doHomeWork());    }}//测试类，main方法public
class Test{    public
static void main(String[] args)    {        int
a = 56;        int
b = 31;        int
c = 26497;        int
d = 11256;        Student s1 = new Student("小明");        Seller s2 = new Seller("老婆婆");         s1.callHelp(a, b);        s2.callHelp(c, d);    }}