thinking in java µÚÎåÕÂ2 ³õʼ»¯
µÚÒ»µã£º
ÔÚ±àд³ÌÐòµÄ¹ý³ÌÖУ¬java»á±£Ö¤¾¡Á¿ÔÚʹÓõÄʱºò³õʼ»¯£¬ËùÒÔÔÚûÓгõʼ»¯µÄ±äÁ¿ÔÚʹÓùý³ÌÖбàÒëÆ÷»á±¨´í£¬ÕâÀïÎÒÃÇ˵µÄ±äÁ¿ÓÐ2ÖÖ£¬Ò»ÖÖÊÇÈ«¾Ö±äÁ¿£¬Ò»ÖÖÊǾֲ¿±äÁ¿£¬È«¾Ö±äÁ¿±àÒëÆ÷»á×Ô¶¯¸³¸ø³õÖµ£¬¶ø¾Ö²¿±äÁ¿²»ÄÜ£¬¿´ÏÂÃæÀý×Ó£º
public class Chushihua {
private int j;
private Integer i1;
public void f() {
int i;
int n = j * 12;
Integer i2;
// int m = i*12;ûÓгõʼ»¯£¬²»ÄÜʹÓÃ
System.out.println(j);
System.out.println(i1);
// System.out.println(i2); ûÓгõʼ»¯£¬²»ÄÜʹÓÃ
}
public static void main(String[] args) {
new Chushihua().f();
}
}
ËùÒÔ˵¶ÔÏóºÍ±äÁ¿ÊÇÒ»ÑùµÄ£¬È«¾ÖµÄjvm»á¸³¸ø³õÖµ£¬µ«ÊǾֲ¿µÄ±ØÐ븳¸ø³õÖµºó²ÅÄÜʹÓã¬ÔÚʹÓõĹý³ÌÖл¹Òª×¢Òâ±äÁ¿µÄ³õʼ»¯Ë³ÐòµÄÎÊÌâ¡£
µÚ¶þµã£º
¹¹ÔìÆ÷ºÍϵͳ×Ô¶¯³õʼ»¯µÄ˳Ðò£¬
public class Counter {
private Integer i = new Integer(5);
Counter() {
System.out.println(i);
System.out.println(j);
i = new Integer(7);
System.out.println(i);
}
private Integer j;
public static void main(String[] args) {
new Counter();
}
}
Êä³ö½á¹û£º
5
null
7
ÓÉ´ËÀý×Ó¿ÉÒÔ¿´³ö˳Ðò£¬jvm»áÏȶÔÈ«¾Ö±äÁ¿½øÐгõʼ»¯£¬Ò²¾ÍÊǹ¹Ôì·½·¨µÄ¸³Öµ²Ù×÷ÊÇÔÚ³õʼ»¯Ö®ºóµÄ¡£
Ò²¾ÍÊÇÔÚÀàµÄÄÚ²¿£¬±äÁ¿¶¨ÒåµÄÏȺó˳Ðò¾ö¶¨Á˳õʼ»¯µÄ˳Ðò¡£¼´Ê¹±äÁ¿É¢ÂäÔÚ¸÷¸ö·½·¨Ö®¼ä£¬ËûÃÇÈÔ»áÔÚ¹¹ÔìÆ÷֮ǰ³õʼ»¯¡£
¾²Ì¬Êý¾ÝµÄ³õʼ»¯£ºÎÞÂÛ´´½¨¶àÉÙ¸ö¶ÔÏ󣬾²Ì¬¶ÔÏóÖ»Õ¼ÓÐÒ»·Ý´æ´¢ÇøÓò¡£Static¹Ø¼ü×Ö²»ÄÜÓ¦ÓÃÓÚ¾Ö²¿±äÁ¿£¬Òò´ËËûÖ»ÄÜ×÷ÓÃÓÚÓò¡£
×ܽᣬһ¸ö¶ÔÏóÔÚ´´½¨µÄ¹ý³ÌÖеijõʼ»¯¡£
³õʼ»¯µÄ˳ÐòÊÇÏȾ²Ì¬¶ÔÏó£¬È»ºóÊÇ“·Ç¾²Ì¬”µÄ¶ÔÏ󣬲¢ÇÒ¾²Ì¬µÄ¶ÔÏóÔÚµÚÒ»´Î¶ÔÏó³õʼ»¯µÄʱºòÖ»³õʼ»¯Ò»´Î¡£
¹¹ÔìÆ÷ÆäʵҲÊǾ²Ì¬·½·¨¡£
¾²Ì¬³õʼ»¯¿é£¬µ±Ê×´ÎÉú³ÉÕâ¸öÀàµÄÒ»¸ö¶ÔÏóʱ£¬»òÕßÊ״ηÃÎÊÊôÓÚÄǸöÀàµÄ¾²Ì¬Êý¾Ý³ÉԱʱ£¨¼´Ê¹´ÓδÊä³ö¹úÄǸöÀàµÄ¶ÔÏ󣩣¬Õâ¶Î´úÂë½öÖ´ÐÐÒ»´Î¡£·Ç¾²Ì¬µÄ³õʼ»¯¿éÊÀ½çºÍ¾²Ì¬µÄ³õʼ»¯¿éÊÇÒ»ÑùµÄ£¬Ö»ÊÇÉÙÁËstatic
class Cup {
Cup(int i) {
System
Ïà¹ØÎĵµ£º
JAVAºËÐļ¼Êõ¹Ûºó¸Ð
ÕâÖÜ´ó¼Ò¶¼»ù±¾ÉÏÂòÁËÒ»±¾¡¶JAVAºËÐļ¼Êõ¡·À´¿´£¬ËäÈ»ÎÒµÄÊéÏÂÖܲÅÄÜÄõ½£¬µ«ÊÇÎÒ»¹ÊÇ·ÁËϱðÈ˵쬴óÖÂÁ˽âÁËÒ»ÏÂÀïÃæµÄÄÚÈÝ¡£ÒÔϾÍÊÇÎÒ´Ö²ÚµÄÕûÀí¡£
JAVA²¢²»Ö»ÊÇÒ»ÖÖÓïÑÔ£¬¶øÊÇÒ»¸öÍêÕûµÄƽ̨£¬ÓÐÒ»¸öÅÓ´óµÄ¿â£¬ÆäÖаüº¬ºÜ¶à¿ÉÒÔÖØÓõĴúÂëºÍÒ»¸öÌṩÖîÈ簲ȫÐÔ£¬¿ç²Ù×÷ϵͳµÄ¿ÉÒÆ ......
1, ±£Ö¤Ḭ̈߳²È«µÄÈýÖÖ·½·¨
:
a, ²»Òª¿çÏ̷߳ÃÎʹ²Ïí±äÁ¿
b, ʹ¹²Ïí±äÁ¿ÊÇ
finalÀàÐ͵Ä
c, ½«¹²Ïí±äÁ¿µÄ²Ù×÷¼ÓÉÏͬ²½
2, Ò»¿ªÊ¼¾Í½«ÀàÉè¼Æ³ÉḬ̈߳²È«µÄ
, ±ÈÔÚºóÆÚÖØÐÂÐÞ¸´Ëü
,¸üÈÝÒ×
.
3, ±àд¶àÏ̳߳ÌÐò
, Ê×ÏÈ
±£Ö¤ËüÊÇÕýÈ·µÄ
, Æä´ÎÔÙ¿¼ÂÇÐÔÄÜ
......
±¾ÎÄ´Óhttp://www.blogjava.net/breezedancer/archive/2007/07/19/131264.html×ªÔØ
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
//¶ÏµãÐø´ ......
class EnclosingOne {
public class InsideOne {
}
}
public class B {
public static void main(String[] args) {
EnclosingOne eo = new EnclosingOne();
EnclosingOne.InsideOne ei = eo.new InsideOne();
}
} ......