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Effective Java¶ÁÊé±Ê¼Ç

package chape8;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* µÚ°ËÕ ͨÓóÌÐòÉè¼Æ
* µÚ45Ìõ£º ½«¾Ö²¿±äÁ¿µÄ×÷ÓÃÓò¼õСµ½×îС
*   ½«¾Ö²¿±äÁ¿µÄ×÷ÓÃÓò×îС»¯¡£¿ÉÒÔÔöÇ¿´úÂëµÄ¿É¶ÁºÍ¿Éά»¤ÐÔ£¬²¢½µµÍ³ö´íµÄ¿ÉÄÜÐÔ
*   Ҫʹ×÷ÓÃÓò×îС£¬×îÓÐÁ¦µÄ·½·¨¾ÍÊÇÔÚµÚÒ»´ÎʹÓÃËüµÄʱºòÉùÃ÷£»Èç¹ûÌáǰÉùÃ÷»áÔì³É
* һƬ»ìÂÒ£»Ò²»á·ÖÉ¢×¢ÒâÁ¦
* ¼¸ºõÿ¸ö¾Ö²¿±äÁ¿µÄÉùÃ÷¶¼Ó¦¸Ã°üÀ¨Ò»¸ö³õʼ»¯µÃ±í´ïʽ£»
* ÀýÈ磺
* for(Element e : c)
* {
* dosomthing(e);
* }
* Õâ¸öÊÇjava1.5ÒÔÉϵİ汾µÄforÑ­»·µÄÊ×ÏÈ¿¼ÂǵÄд·¨£»
* ¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£
* ÔÙÀ´¿´£ºÏÂÃæÊÇjava1.5ÒÔǰµÄforÑ­»·
* List c = new ArrayList ();
Iterator it = c.iterator();
while(it.hasNext())
{
it.next();
}
List c1 = new ArrayList();
Iterator it1 = c1.iterator();
while(it.hasNext())
{
it1.next();
}
* µ«Äã±È½ÏÒ»ÏÂÕâÁ½¸öÑ­»·£¬µÚ¶þ¸öÑ­»·ÊÇÎÒÒªµÄµÚ¶þ¸öÑ­»· ÎÒΪÁË·½±ã½«µÚÒ»¸öÑ­»·
* ¸´ÖÆÁËÒ»·Ý £¬È»ºó¸Ä±äÁ˱äÁ¿µÄÃû³ÆÀ´´ïµ½Á½¸öÑ­»·µÄÄ¿µÄ£¬這樣寫 ide²»會報錯
* µ«ÊÇÏÔÈ»ÎÒÍüÁËÐÞ¸ÄһЩ±ØÐëÐ޸ĵĶ«Î÷£¬µ«ÊǵÚÒ»¸öÑ­»·ÖеÄitÔÚµÚ¶þ¸öµÄ×÷ÓÃÓòÖÐÒÀÈ»ÓÐЧ ÕâÑù»áÔì³ÉÄãÈÏΪ
* ĪÃûÆäÃîµÄÎÊÌ⣻
* Èç¹û這樣寫£º
*   List c = new ArrayList ();
for (Iterator it = c.iterator();it.hasNext();)
{
it.next();
}
List c1 = new ArrayList();
while(Iterator it1 = c1.iterator();it.hasNext();)
{
it1.next();
}
    µÚÒ»個Ñ­環ÖеÄ變Á¿µÄ×÷ÓÃÓò²»會Ó°響µ½µÚ¶þ個 這樣ide¾Í會報錯 ¿ÉÒÔ¼°時¸Ä³É£»
   
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* @author lee
*
*/
public class Chape45 {
public static void main(String[] args) {
/*List c = new ArrayList ();
Iterator it = c.iterator();
while(it.hasNext())
{
it.next();
}
List c1 = new ArrayList();
Iterator it1 = c1.iterator();
while(it.hasNext())
{
it1


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