javaÖÐRandomµÄÓ÷¨
import java.util.Random;
public class MathOperators {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
//Ëæ»úÊýµÄ²úÉú
int[] arr = new int[10];
Random r = new Random();
for (int m = 0; m < arr.length; m++)
{
arr[m] = r.nextInt(100);
}
for (int n = 0; n < arr.length; n++)
{
System.out.println(arr[n]);
}
}
}
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ÔÎÄ£ºSome Java Concurrency Tips
×÷ÕߣºCarol McDonald
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http://weblogs.java.net/blog/caroljmcdonald/archive/2009/09/17/some-java-concurrency-tips
ÕâÊÇÀ´×ÔJoshua Bloch¡¢Brian GoetzºÍÆäËûÈ˵ÄÒ»¸ö¹ØÓÚһЩ²¢·¢¼¼ÇɵĻã×Ü¡£
Ê×ÏÈÑ¡Ôñ²»¿É±äµÄ¶ÔÏó/Êý¾Ý
²»¿É±ä¶ÔÏó£¨immutable ......
JOSSO
JOSSO(Java Open Single Sign-On)ÊÇÒ»¸ö¿ªÔ´µÄJ2EE-basedµÄSSO(SSO£ºµ¥Ò»µÇ¼¼¼ÊõÊÇÒ»ÖÖÈÏÖ¤ºÍÊÚȨ»úÖÆ£¬ËüÔÊÐí×¢²áÓû§Ö»ÐèÒªÔÚÈÎÒ»³ÉÔ±ÍøÕ¾ÉϵǼһ´Î£¬¶øºóÊÚȨ·ÃÎÊÆäËûÁ¬½ÓµÄ·ÖÖ§ÍøÕ¾£¬ÎÞÐèÔÙ½øÐÐÑéÖ¤µÇ¼)»ù´¡½á¹¹.ËüµÄÄ¿µÄÊÇÌṩһÖÖÓÃÀ´½â¾öÔÚͳһƽ̨ÉϽøÐÐÓû§¼¯ÖÐÈÏÖ¤µÄ·½°¸.
¸ü¶àJOSSOÐÅÏ ......
JDK1.4ÖÐ
Map map = new HashMap();
Iterator it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
Object key = entry.getKey();
Object value = entry.getValue();
}
JDK1.5ÖÐ,Ó¦ÓÃÐÂÌØÐÔFor-EachÑ»·
Map m = new HashMap();
......
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public class Test {
static int multiply(int n){
if(n==1||n==0)
return n;
else
return n*multiply(n-1);
}
public static void main(String[] args){
System.out.println(multiply(10));
}
......
java ËÄÖÖ±éÀúListµÄ·½·¨¼°±È½Ï
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ListTest {
public static void main(String args[]){
List<Long> lists = new ArrayList<Long>();
for(Long i=0l;i<1000000l;i++){
......