javaËæ»úÊýµÄ²úÉú
1. import java.util.*;
2.(A) public class Test
{ public static void main(String[] args)
{
//Éú³É [0-n) ¸ö²»Öظ´µÄËæ»úÊý st ÓÃÀ´±£´æÕâÐ©Ëæ»úÊý
ArrayList list = new ArrayList();
int n = 10;
Random rand = new Random();
boolean[] bool = new boolean[n];
int num =0;
for (int i = 0; i<n; i++)
{
do{//Èç¹û²úÉúµÄÊýÏàͬ¼ÌÐøÑ»·
num = rand.nextInt(n);
}while(bool[num]);
bool[num] =true;
list.add(num);
}
System.out.println (list);
}
(B)
public class Test
{
public static void main(String[] args)
{
&
Ïà¹ØÎĵµ£º
Javaѧϰ´ÓÈëÃŵ½¾«Í¨
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJ ......
ÔÚ»ñÈ¡Îı¾µÄʱºò£¬¾³£Óöµ½Êý¾Ý¸ñʽµÄÎÊÌ⣬ÐèÒªÅжϻòת»»¡£
±¾ÎÄÖ¼ÔÚ½â¾öÈ«½Ç·ûºÅת»»Îª°ë½Ç·ûºÅµÄÎÊÌâ¡£
ÍøÉÏ´óÌåÓÐÁ½ÖÖ·½·¨£º×ª»»±àÂë»òÔòÌæ»»¡£
ÎÒʹÓõÄÊÇת»»±àÂë
1. string checkStr="£±£²£³456";
2. //ÅжÏÊÇ·ñ°üº¬È«½Ç×Ö·û[1]
3. if(checkStr.length() != checkStr.getBytes().length) ......
ÒÔÏÂÊÇ Java ÅжÏ×Ö·û´®ÊÇ·ñΪ¿ÕµÄÈýÖÖ·½·¨.
·½·¨Ò»: ×î¶àÈËʹÓõÄÒ»¸ö·½·¨, Ö±¹Û, ·½±ã, µ«Ð§ÂʺܵÍ.
·½·¨¶þ: ±È½Ï×Ö·û´®³¤¶È, ЧÂʸß, ÊÇÎÒÖªµÀµÄ×îºÃÒ»¸ö·½·¨.
·½·¨Èý: Java SE 6.0 ²Å¿ªÊ¼ÌṩµÄ·½·¨, ЧÂʺͷ½·¨¶þ¼¸ºõÏàµÈ, µ«³öÓÚ¼æÈÝÐÔ¿¼ÂÇ, ÍÆ¼öʹÓ÷½·¨¶þ.
ÒÔÏ´úÂëÔÚÎÒ»úÆ÷ÉϵÄÔËÐнá¹û: (»úÆ÷ÐÔÄܲ»Ò», ½ö¹ ......
Javaѧϰ´ÓÈëÃŵ½¾«Í¨
ѧϰǰÁ˽â
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJDKÊÇSun¹«Ë¾·¢²¼µÄJDK£¬³ýÁËSunÖ®Í⣠......
Õ⼸Ì죬ÔÚÍøÉÏËÑÁËºÜ¶à¹ØÓÚjavaµÄ¶«Î÷£¬ÏÖÔÚ¸ø´ó¼Ò×ܽáһϣ¬·Ç³£ÓÐÓÃŶ£¬ºÜ¶à¶«Î÷ÎÒÃÇÔÚ¹úÄÚÊÇÎÞ·¨Á˽⵽µÄ
java³ÌÐòÔ±±ØÈ¥µÄ¹úÍâÍøÕ¾
http://www.onjava.com
ÿÖܶ¼ÓÐÐÂÎÄÕ·¢±í
http://www.developer.com/java
ÓÉGamelan.com ά»¤µÄJava¼¼ÊõÎÄÕÂÍøÕ¾
http://www.java.net
Sun¹«Ë¾Î¬»¤µÄÒ»¸öJavaÉçÇøÍøÕ¾
http:/ ......