java´«ÖµÎÊÌâ.
Java´«µÝ²ÎÊýÓÐÁ½ÖÖ £ºÖµ´«µÝ£¬ÒýÓô«µÝ
Ò»°ãÒýÓÃÀàÐÍ ÊÇÒýÓô«µÝ£¬ÖµÀàÐÍÊÇÖµ´«µÝ
ÖµÀàÐÍÊÇÔʼÊý¾ÝÀàÐÍ °üÀ¨ int,byte,char short long,boolean,float,double
ÒýÓÃÀàÐ;ÍÊÇÒ»°ãµÄclassÀà µ±È»Ò²°üÀ¨ÔʼÊý¾ÝµÄ·â×°ÀàÐÍ ±ÈÈçintµÄ
·â×°ÀàÐÍΪInteger
Ò»°ãÇé¿öÏ£º
Öµ´«µÝ£º
Àý×Ó 1 public void show1(int str)
{
Str=4;
}
public static void main(String[] args) {
int k=1;
System.out.println(id);
s.show1(str);
System.out.println(id);
}
Êä³ö½á¹ûΪ 1
1
Öµ´«µÝ±íÏÖΪ ¶Ô¶¨ÒåÊý¾ÝµÄÒ»·Ý¿½±´ ²»Ó°ÏìÔʼÊý¾ÝµÄÖµ
ÒýÓô«µÝ
Àý×Ó 2 public void show1(List list)
{
List.add(“dddddd”);
}
public static void main(String[] args) {
List list=new ArrayList()
System.out.println(list.size);
s.show1(list);
System.out.println(list.size);
}
Êä³ö½á¹ûΪ 0
1
ÒýÓô«µÝ±íÏÖΪ ½«ÒýÓöÔÏóµÄÄÚ´æµØÖ·´«µÝ¸øÁË show1·½·¨
²Ù×÷ʱ show1·½·¨»á¸ù¾ÝµØÖ·È¥¸Ä±äÒýÓõÄÖµ£¬Êµ¼ÊÉϾÍÊÇÐÞ¸Ä
ÁËÔʼµÄÖµ
JavaÖÐStringÊǸöÌØ±ðµÄÀà final¹Ø¼ü×ÖÐÞÊÎ ²»Äܱ»¼Ì³Ð£¬
Ò»°ãÇé¿öÀà¶¼ÊôÓÚÒýÓÃÊý¾ÝÀàÐÍ
¿ÉÒÔ¿´Ò»ÏÂËûµÄ´«µÝЧ¹û
Àý×Ó 3 public void show1(String str)
{
str=new String("dddddddddddddd");
}
public static void main(String[] args) {
String str=new String ("liaomin"); System.out.println(str);
s.show1(str);
System.out.println(str);
}
Êä³ö½á¹ûΪ liaomin
liaomin
Èç¹
Ïà¹ØÎĵµ£º
import
java.util.Random;
/**
*
ÅÅÐò²âÊÔÀà
*
*
ÅÅÐòËã·¨µÄ·ÖÀàÈçÏ£º
*
1.
²åÈëÅÅÐò£¨Ö±½Ó²åÈëÅÅÐò¡¢ÕÛ°ë²åÈëÅÅÐò¡¢Ï£¶ûÅÅÐò£©£»
*
2.
½»»»ÅÅÐò£¨Ã°ÅÝÅÝÅÅÐò¡¢¿ìËÙÅÅÐò£©£»
*
3.
Ñ¡ÔñÅÅÐò£¨Ö±½ÓÑ¡ÔñÅÅÐò¡¢¶ÑÅÅÐò£©£»
  ......
/**
* ±£ÁôÁ½Î»Ð¡Êý
* @param d
* @return
*/
private static double remainTwoNumbers(double d){
java.math.BigDecimal f1 = new java.math.BigDecimal(d);//СÊýµãºó±£Áô2Î ......
/**
* ´¦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{
......
1.JAVAÁ¬½ÓACCESSÊý¾Ý¿â
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ="+application.getRealPath("/Data/ReportDemo.mdb");
Connection conn = DriverManager.getConnection(url,"","");
ÔÚÉÏÃæµÄÁ¬½Ó·½·¨ÖУ¬ËùÉæ¼°µ½µÄ²ÎÊýº¬ÒåÈçÏÂËùʾ ......