JAVA回调机制(CallBack)

http://www.importnew.com/19301.html

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);

}

}