1. 閉包代表（定義）了一段代碼（操作）：光看這一句，其實方法也能實現(xiàn)相同的功能呀。
2. 閉包可以作為方法的參數(shù)：這才是閉包的特殊之處和真正意義。


下面演示一個只有閉包能做，方法做不到的例子。

方法的作用是提煉共性，再代之以不同的參數(shù)。即對不同的“數(shù)據(jù)”進行相同的“操作”。從3個loop可以看出：
????Comm1：相同的數(shù)據(jù)
????Comm2：相同的for循環(huán)
????Diff1：循環(huán)體內(nèi)執(zhí)行的操作不同

Comm1很好搞定，參數(shù)aa就是提煉出的共性
Comm2看似是共性，卻很難提煉，因為for循環(huán)和循環(huán)體內(nèi)的操作實際是一個整體；Comm2被Diff1糾纏，3個loop是完全不同的3組操作，無法提煉。

比如，如果現(xiàn)在想要按照奇數(shù)循環(huán)，只能依次改動三個循環(huán)。?

int []?aa? = ?[ 1 ,? 2 ,? 3 ,? 4 ,? 5 ,? 6 ] // ?loop1 for ?( int ?i? = ? 0 ;?i? < ?aa.length;?i ++ )?{ ????println?aa[i] } // ?loop2 for ?( int ?i? = ? 0 ;?i? < ?aa.length;?i ++ )?{ ????print?aa[i] } // ?loop3 for ?( int ?i? = ? 0 ;?i? < ?aa.length;?i ++ )?{ ????print?aa[i]? + ? ' ? ' }

???????? // ?loop1 for ?( int ?i? = ? 0 ;?i? < ?aa.length;?i? += ? 2 )?{ ????println?aa[i] } // ?loop2 for ?( int ?i? = ? 0 ;?i? < ?aa.length;?i? += ? 2 )?{ ????print?aa[i] } // ?loop3 for ?( int ?i? = ? 0 ;?i? < ?aa.length;?i? += ? 2 )?{ ????print?aa[i]? + ? ' ? ' }

下面我們看看閉包的強大之處，Comm1和Comm2都被很好的封裝在了loop方法里；Diff1則作為參數(shù)（閉包）傳入loop方法。

如果我們想要改變循環(huán)的方式，只需要改一處

static?void?loop(int[]?aa,?Closure?c)?{ ????for?(int?i?=?0;?i?<?aa.length;?i++)?{ ????????c.call(aa[i]) ????} ????println?'?' }	static?void?loop(int[]?aa,?Closure?c)?{ ????for?(int?i?=?0;?i?<?aa.length;?i?+=?2)?{ ????????c.call(aa[i]) ????} ????println?'?' }

總結(jié)，閉包本身并沒什么難點，關(guān)鍵是怎樣合理的設(shè)計一個接受Closure類型參數(shù)的方法。從GDK的方法也可以看出，大多數(shù)接受閉包的方法都是和數(shù)組迭代有關(guān)（也即循環(huán)）。

Definition

Using




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附上一個Java的匿名內(nèi)部類的例子，用來和閉包對比一下。
2008

10-25 Bind the thief's arms with rope.

10-26 Beer tests bitter.

10-27 This pocketknife has two blades.

10-28 If you don't do the work well, you will incur blame.

10-29 My mind was a total blank.

10-30 A blast of wind stirred up the dust.

10-31 The two brothers bled for their country and died happily.

11-1? His manner was a blend of friendliness and respect.

11-2 He gets an awful bloody nose.

11-3 The roses are in bloom.

11-4 The mother often boasts to the neighbors about the success of her children.

11-5 It is very bold of them to venture to travel by sea.

11-6 The bolts are all tight enough.

11-7 The terrorists planted a bomb in the building.

11-8 Comment interests form a bond between us.

11-9 I've booked you in at the hotel.

11-10 China is having a great boom in real estate.

11-11 This new technology will boost the production by 30% next year.

11-12 The criminal escaped over the border.

11-13 I am bored by his tedious talk.

11-14 The football bounced off the goal-post.

11-15 You are bound to succeed.

11-16 The new boundaries of the country were fixed after war.

11-17 The arrow was still held in the bow.

11-18 The brake didn't work.

11-19 He has his own brand of humour.

11-20 He has traveled the length and breadth of China.

11-21 Tom was bred up as a sailor.

11-22 We enjoyed the cool breeze that came from the lake.

11-23 Next Sunday Alvon will become AFu's bride.

11-24 Be brief and to the point.
最近BI的項目不忙，抽空懷念了一下編程技術(shù)：

1. <Flex 3> 同事給了我份Flex的教程，把前三章看了一下，有了初步的了解；FlexBuilder也用了一把，不錯，效果很絢麗。

2. <IDEA 8> 恰逢IDEA 8 EAP (Early Access Preview)發(fā)布，搞了一個裝上試試。主要試了試對Flex的支持，感覺還有待提升。另外IDEA對內(nèi)存的消耗似乎越來越多了，沒做深入體驗。

3. <Grails 1.0.3> 拿出了小二去年送我的生日禮物《Grails權(quán)威指南》，翻了翻，Hello World一會就做好了。打算再進一步體驗一下。
這是飛俠兄做的Flex網(wǎng)站，很好玩。
2008

國慶這個假放的，一直沒背單詞，又要慢慢追趕了。


9-25
All bacteria are larger than viruses.

9-26
The thief has gotten into the room off the balcony.

9-27
The treaty bans all nuclear tests.

9-28
On their way back home, they encountered a band of robbers.

9-29
We heard the bang of a gun.

9-30
The company went bankrupt.

10-1
The patriots hold aloft the banner of independence.

10-2
He opened a snake bar.
They barred the street to traffic.

10-3
The path leads to a bare hill.

10-4
He barely remembered anything she has said that day.

10-5
I make a fair bargain with the shopkeeper.

10-6
The dog always barks at strangers.

10-7
The horses seemed to be satisfied with the comfortable barn.

10-8
The river is a natural barrier between these two nations.

10-9
Baseball is the national sport of the USA.

10-10
Charity towards others is the basis of her philosophy.

10-11
The garden was bathed in moonlight.

10-12
They were faced with a battery of questions.

10-13
She spent her summer vacation in Sanya bay.

10-14
Beams support the roof of a house.

10-15
I cannot bear BB's nagging any longer.

10-16
He has a dense beard.

10-17
I have lost my bearings in all this mass of facts.

10-18
XX saves money on behalf of BB.

10-19
He behaves respectfully toward the elderly.

10-20
She was beloved of all who knew her.

10-21
Fresh air and good food are beneficial to one's health.

10-22
I'll bet you that they will win the next game.

10-23
The service included some readings from the Bible.

10-24
The dealers are bidding against each other at the auction.
2008

8-25
I saw the arrest of the thief.

8-26
The artificial flowers are quite beautiful.

8-27
Please assemble everybody in my office at 3'o clock.

8-28
It is hard to assess the impact of the war.

8-29
The firm's assets were taken over by the bank.

8-30
We assigned tomorrow morning for our meeting.

8-31
She spent most of her time associating with her friends.

9-1
I assume that you have heart the news.

9-2
I proceeded alone on the assumption that he would help.

9-3
He was assured a well paying job upon graduation.

9-4
Chinese athletes won many golden medals in the Olympic Games.

9-5
Attach a label to your suitcase.

9-6
Finally he attained his goal.

9-7
Her work attitude was poor.

9-8
The defendant was represented by his attorney.

9-9
What a singularly attractive lady!

9-10
My mother attributes her good health to careful living.

9-11
Many works of literature and art have a wide and devoted audience.

9-12
You will get an automatic increase in pay every year.

9-13
Some sailboats have auxiliary engines.

9-14
There are no tickets available for Friday's performance.

9-15
NY's avenue is famous for its advertising industry.

9-16
He avoid answering my question.

9-17
We have awaited your coming for days.

9-18
The university awarded him an honorary degree.

9-19
We are fully aware of the gravity of the situation.

9-20
I feel awful this morning.

9-21
He feel awkward with women.

9-22
He was a reporter by background.

9-23
He made a backward step.

9-24
Bacon and eggs are my favourite foods.
世界強隊從來不是靠抽簽抽出來的，中國男籃，我愛你！

“進場的時候，我們把手放在一起，把自己交給這支球隊，同時也把這支球隊扛在自己肩上，我們所有的人都在為這個球隊努力。” -- 大大的姚明
中國體操男團，背負四年的壓力，重獲金牌，超感人；

中國男籃vs西班牙，把世錦賽冠軍逼到打加時，雖敗猶榮；

中國男足都是Sha Bi，窩囊廢。 又堅持了一個月，中間短了4、5天，后來靠每天多背一個，給補了回來。


7/25/2008
It is very essential to analyze the causes of his failure.

7/26/2008
This is an old family firm founded by their French ancestor.

7/27/2008
Can you anchor the boat in this storm?

7/28/2008
His family has lived in this ancient city for more than two centuries.

7/29/2008
The roof is at an angle of 120 degrees to the walls.
I would like to hear your angle in this dispute.

7/30/2008
The whole nation celebrated cheerfully the fiftieth anniversary of the founding of the PRC.

7/31/2008
These flies are annoying me.
We can annoy the enemy by air raids.

8/1/2008
BB's thesis was published in the college annual.

8/2/2008
We are not anticipating that there will be much trouble.

8/3/2008
The antique dealer has a display of his valuable antiques.

8/4/2008
He caused his wife great anxiety by driving a long distance alone.

8/5/2008
It's too late now, anyhow.

8/6/2008
It was apparent that they all understood.

8/7/2008
We are appealing for money to build a teacher's club.

8/8/2008
He had no appetite to fight.

8/9/2008
He won standing applause after he ended his speech.

8/10/2008
This is an appliance for opening cans.

8/11/2008
That pretty lady is a hopeful applicant for the position.

8/12/2008
They applied to return to China.

8/13/2008
They arranged an appointment for next week.

8/14/2008
We really appreciate the peace and quite of the countryside.
They deeply appreciate his thoughtfulness.

8/15/2008
The professor is easy to approach

8/16/2008
It is appropriate that you should save some money in case you lose your job.

8/17/2008
The decision met the committee's approval.

8/18/2008
His statement is approximate to the truth.

8/19/2008
One should not make an arbitrary decision as to what to do in the future.

8/20/2008
DXP is called the general architect of the construction of socialist modernizations in China.

8/21/2008
Don't argue with me, just do as you are told.

8/22/2008
At later stage, there arose an new problem which seemed insoluble.

8/23/2008
We aroused him from his deep sleep.

8/24/2008
She has arranged numerous contacts between? XX and BB.