ï»??xml version="1.0" encoding="utf-8" standalone="yes"?>日韩精品免费一区二区三区,欧美hdxxxxx,欧美麻豆精品久久久久久http://www.aygfsteel.com/irusist/category/50601.htmlzh-cnTue, 10 Jan 2012 15:02:23 GMTTue, 10 Jan 2012 15:02:23 GMT60- javaä¸çš„"+"æ“作½W?/title><link>http://www.aygfsteel.com/irusist/archive/2012/01/10/368268.html</link><dc:creator>irusisit</dc:creator><author>irusisit</author><pubDate>Tue, 10 Jan 2012 14:35:00 GMT</pubDate><guid>http://www.aygfsteel.com/irusist/archive/2012/01/10/368268.html</guid><wfw:comment>http://www.aygfsteel.com/irusist/comments/368268.html</wfw:comment><comments>http://www.aygfsteel.com/irusist/archive/2012/01/10/368268.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/irusist/comments/commentRss/368268.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/irusist/services/trackbacks/368268.html</trackback:ping><description><![CDATA[ java虚拟机处ç†byteåQŒshortåQŒcharåQŒint¾cÕdž‹ä¹‹é—´çš?#8220;+”æ“作都是ž®†ä»–们è{化æˆint¾cÕdž‹åQŒåŽ‹å…¥æ“ä½œæ•°æ ˆï¼Œç”¨int¾cÕdž‹æ¥åšåŠ 法æ“作的，当java½E‹åºä¸æœ‰˜q˜æœ‰longåQŒfloatåQŒdoubleä¸çš„一¿Uæ—¶åQŒä¼šè½¬åŒ–æˆä»–们之ä¸ä¼˜å…ˆçñ”最高的åQŒä¼˜å…ˆçñ”从longåQŒfloatåQŒdoubleä¾æ¬¡å¢žé«˜ã€‚boolean¾cÕdž‹ä¸Žä¸Šé¢æ‰€è¯´çš„4¿U类型进è¡?+"˜qç®—åQŒç¼–译报错ä¸é€šè¿‡ã€‚基¼‹€¾cÕdž‹ä¸ŽString以外的引用类型进è¡?+"æ“作æ—Óž¼Œ¾~–译器报错ä¸é€šè¿‡ã€?nbsp;当两个éžString的引用类型进è¡?#8220;+”æ“作æ—Óž¼Œ¾~–译器会报错ä¸é€šè¿‡ã€?br /> 当byteåQŒshortåQŒint¾cÕdž‹ä¸ŽString的引用类型进è¡?#8220;+”æ“作æ—Óž¼Œæ¯”如åQŒåœ¨ä¸€ä¸ªé™æ€æ–¹æ³•é‡Œå®šä¹‰å¦‚下åQ?br /><span style="font-size: 12px;"> </span><span style="background-color: #eeeeee; font-size: 13px; color: #0000ff; ">byte</span><span style="background-color: #eeeeee; font-size: 13px; "> b </span><span style="background-color: #eeeeee; font-size: 13px; ">=</span><span style="background-color: #eeeeee; font-size: 13px; "> </span><span style="background-color: #eeeeee; font-size: 13px; ">127</span><span style="background-color: #eeeeee; font-size: 13px; ">;</span><br /><div style="background-color:#eeeeee;font-size:13px;border:1px solid #CCCCCC;padding-right: 5px;padding-bottom: 4px;padding-left: 4px;padding-top: 4px;width: 98%;word-break:break-all"> String str1 = "string";</div><span style="background-color: #eeeeee; font-size: 13px; "> String str </span><span style="background-color: #eeeeee; font-size: 13px; ">=</span><span style="background-color: #eeeeee; font-size: 13px; "> b </span><span style="background-color: #eeeeee; font-size: 13px; ">+</span><span style="background-color: #eeeeee; font-size: 13px; "> str1; </span><span style="font-size: 12px;"> <br /></span><div><p><font size="1"> 产生的å—节ç 为：</font><br /></p><div style="text-align: left;"><span style="font-size: 10pt; "> 0: bipush 127</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 2: istore_1</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 3: ldc #2; //String string</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 5: astore_2</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 6: new #3; //class java/lang/StringBuilder</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 9: dup</span></div><div style="text-align: left; "><span style="font-size: 10pt; "> 10: invokespecial #4; //Method java/lang/StringBuilder."<init>":()V</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 13: iload_1</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 14: invokevirtual #5; //Method java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 17: aload_2</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 18: invokevirtual #6; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 21: invokevirtual #7; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;</span></div><div style="text-align: left;"><span style="font-size: 10pt; "> 24: astore_3</span></div><div><div style="text-align: left;"><span style="font-size: 10pt; "> 25: return</span></div> å¯è§åQŒString对象的与byte˜q›è¡Œ“+”æ“作会先生æˆä¸€ä¸ªStringBuilder(jdk5以åŽåQŒjdk5以å‰æ˜¯StringBuffer)对象åQŒå°†byte¾cÕdž‹è½¬æ¢ä¸ºint¾cÕdž‹ä¼ å…¥StringBuilder.append(int)的方法内,å†å°†Stringå¯¹è±¡ä¼ å…¥StringBuilder.append(String)æ–ÒŽ(gu¨©)³•å†…，最åŽè°ƒç”¨è¿™ä¸ªStringBuilder对象的toStringæ–ÒŽ(gu¨©)³•å¾—到String对象。åŒç†ï¼ŒshortåQŒboolean,long,float,double¾cÕdž‹åQŒå¼•ç”¨ç±»åž‹ä¸ŽString对象˜q›è¡Œ“+”æ“作也是åŒæ ·å¤„ç†åQŒåˆ†åˆ«è°ƒç”¨StringBuilderçš„ä¸åŒå‚æ•°çš„é‡è²æ–ÒŽ(gu¨©)³•åQŒä¸˜q‡char对象与short会有所ä¸åŒåQŒä»–ä¸ä¼šè½¬æ¢æˆint¾cÕdž‹åQŒè€Œæ˜¯ç›´æŽ¥ž®†char¾cÕdž‹çš„å€ég¼ 递给StringBuilderçš„append(char)的方法ã€?/div></div><div><p> </p></div><img src ="http://www.aygfsteel.com/irusist/aggbug/368268.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/irusist/" target="_blank">irusisit</a> 2012-01-10 22:35 <a href="http://www.aygfsteel.com/irusist/archive/2012/01/10/368268.html#Feedback" target="_blank" style="text-decoration:none;">å‘表评论</a></div>]]></description></item></channel></rss> <footer>
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