Java´«ÖµºÍ´«ÒýÓ㺠ÕÅÈýºÍÀîËĵĹÊÊÂ
ÏÂÃæ¿ª½²¹ÊÊ£º
´ÓǰÓиö·¿¼ä£¬·¿¼äÀïÓзÝÎĵµ£¬·¿¼ä»¹ÓÐÒ»°ÑÔ¿³×¡£ Õâ°ÑÔ¿³×ÔÚÕÅÈýÊÖÀï¡£
ÕâʱÀîËÄÀ´ÏòÕÅÈýÒªÄÇ·ÝÎĵµ¡£ ÕÅÈý²»Ì«Ï²»¶ÀîËÄ£¬µ«ÓÖŵ¢ÎóÁË
¹¤×÷²»ºÃ½»´ú¡£ÓÚÊÇÕÅÈý¾Í°Ñ·¿¼äÀïÎĵµµÄÎĵµ¸´Ó¡ÁËÒ»·Ý£¬È»ºó°ÑÄǸö¸´Ó¡¼þ½»¸øÁËÀîËÄ£¨Õâ½Ð´«Öµ£©¡£
ÀîËÄÄõ½Îĵµºó£¨¸´Ó¡¼þ£©£¬ºúÂÒÐÞ¸ÄÒ»·¬£¬ÐÄÏ룺ÕÅÈý£¬Õâ»ØÒªÄãºÃ¿´¡£¿ÉÊÇËûûÏëµ½ÄÇ·ÝÔ¼þ»¹ºÃºÃµÄÔÚÕÅÈýµÄ·¿¼äÀïËø×ÅÄØ¡£
ÒÔÉϹÊʶÔÓ¦£º
public static void counter(int count) {
count = 2;
}
Õâ¸öÀîËIJ»¸ÊÐÄ£¬ÓÚÊÇËû͵͵µØÅäÁËÒ»°ÑÕÅÈýµÄÔ¿³×£¨Õâ½Ð´«ÒýÓã©£¬ ×¼±¸½øÈë·¿¼äÐÞ¸ÄÄÇ·ÝÎĵµ¡£
Õâʱ»ÕÅÈý¼°Ê±·¢ÏÖ£¬ËûÇÄÇĵİÑÀîËÄÅäµÄÔ¿³×»»³ÉÁËÁíÍâÒ»¸ö·¿¼äµÄÔ¿³×¡£
ÀîËÄÈ¥ÁË´íÎóµÄ·¿¼ä¡£ ÕÅÈýÔÙ´ÎÒÔʤÀû¸æÖÕ£¡
ÒÔÉϹÊʶÔÓ¦£º
public static void changeA1(int[] ints) {
ints = temp;
int[] temp = new int[3];
ints[0] = 7;
ints[1] = 8;
ints[2] = 9;
}
ÀîËÄïÆ¶ø²»ÉᣬËû³ÃÕÅÈý»¹³Á½þÁ½´ÎʤÀûµÄϲÔÃÀÖÕÓڳɹ¦µÄÅäÁËÔ¿³×£¨Õâ½Ð´«ÒýÓã©£¬´ïµ½ÁËÐÞ¸ÄÄÇ·ÝÎĵµÔ¼þµÄÄ¿µÄ¡£
ÒÔÉϹÊʶÔÓ¦£º
public static void changeA2(int[] ints) {
ints[0] = 4;
ints[1] = 5;
ints[2] = 6;
}
¹Êʽ²ÍêÁË¡£ ÕâÀïÐèҪעÒâµÄÊÇÎÞÂÛÊÇ´«Öµ»¹ÊÇ´«ÒýÓ㬴«µÄ¶¼ÊǸ´±¾£¨Îĵµ¸´Ó¡¼þ»òÅäµÄÔ¿³×£©¡£
Ïà¹ØÎĵµ£º
ÏÖÔÚ ËùÓÃJava°æ±¾,DateÀ๹Ôì·½·¨Date(0)µÄʱ¼ä²»ÊÇThu Jan 01 01:00:00 GMT 1970ÁË£¬¶øÊÇThu Jan 01 08:00:00 CST 1970¡££¨ 1970 Äê1 ÔÂ1 ÈÕ8ʱ0·Ö0Ãë ÐÇÆÚ4£©
Ϊʲô Date b1=new Date(623289600000); ²»¿ÉÒÔ£¬ÏÂÃæµÄÈ´¿ÉÒÔÄØ£¿
long a=623289600000L;
Date b1=new Date(a); Ò ......
Thread.currentThread().getName().equals("xxxx") ÕâÌõÓï¾ä·µ»ØÒ»¸ö bool Ð͵Ľá¹û¡£Åжϵ±Ç°ÔËÐеĽø³ÌÊÇ·ñºÍ xxxx µÄÃû×ÖÒ»Ñù¡£
¶¨ÒåÏ̵߳ÄÁ½ÖÖ·½·¨£ºclass a1 extends Thread{ } a1 xiancheng=new a1();
¶þÊÇ£ºÓýӿڻص÷¼¼Êõ¡£ class a1 implements Runnable{ } a1 ......
/**
* ´¦Àíʱ¼äÒì³£ Date to String
* Èç¹ûת»»³öÏÖÒì³£»á¸øÄ¬ÈÏÖµ00:00
* @param time
* @param sdf
* @return
*/
public static String handleDateParseException(Object time){
String tempTime = "00:00";
try{
......
Ò»¡¢´Ó¸ù±¾ÉÏÈÏʶjava.lang.StringÀàºÍString³Ø
Ê×ÏÈ£¬ÎÒ½¨ÒéÏÈ¿´¿´StringÀàµÄÔ´ÂëʵÏÖ£¬ÕâÊÇ´Ó±¾ÖÊÉÏÈÏʶStringÀàµÄ¸ù±¾³ö·¢µã¡£´ÓÖпÉÒÔ¿´µ½£º
1¡¢StringÀàÊÇfinalµÄ£¬²»¿É±»¼Ì³Ð¡£public final class String¡£
2¡¢StringÀàÊǵı¾ÖÊÊÇ×Ö·ûÊý×échar[], ²¢ÇÒÆäÖµ²»¿É¸Ä±ä¡£private final char value[];
È»ºó´ò¿ªStr ......
import java.lang.reflect.*;
public class ReflectTester {
public Object copy(Object object) throws Exception{
//»ñµÃ¶ÔÏóµÄÀàÐÍ
Class classType=object.getClass();
System.out.println("Class:"+classType.getName());
//ͨ¹ýĬÈϹ¹Ôì·½·¨´´½¨Ò»¸öеĶÔÏó
Object objectCo ......