JavaÖеÄö¾ÙÀàÐÍ£¬enum
public class MyEnumTestMain {
public enum MyenumTest{red,blue,green,black}//¶¨Òåö¾ÙÀàÐÍ
public static void main(String[] args) {
MyenumTest mt = MyenumTest.red;//redÏ൱ÓÚö¾ÙµÄ¾²Ì¬ÊôÐÔ
switch(mt){
case red:
System.out.println("red");
break;
case blue:
System.out.println("blue");
break;
default:
System.out.println("ÆäËû");
}
}
}
Ïà¹ØÎĵµ£º
ÃüÃû¹æ·¶
¶¨ÒåÕâ¸ö¹æ·¶µÄÄ¿µÄÊÇÈÃÏîÄ¿ÖÐËùÓеÄÎĵµ¶¼¿´ÆðÀ´ÏñÒ»¸öÈËдµÄ£¬Ôö¼Ó¿É¶ÁÐÔ£¬¼õÉÙÏîÄ¿×éÖÐÒòΪ»»È˶ø´øÀ´µÄËðʧ¡££¨ÕâЩ¹æ·¶²¢²»ÊÇÒ»¶¨Òª¾ø¶Ô×ñÊØ£¬µ«ÊÇÒ»¶¨ÒªÈóÌÐòÓÐÁ¼ºÃµÄ¿É¶ÁÐÔ£©
Package µÄÃüÃû
Package µÄÃû×ÖÓ¦¸Ã¶¼ÊÇÓÉÒ»¸öСдµ¥´Ê×é³É¡£
Class µÄÃüÃû
Class µÄÃû×Ö±ØÐë ......
package¡¢import
µÄÏà¹ØÎÊÌâÊÇjavaÖеÄÒ»¸ö²»´ó²»Ð¡µÄÎÊÌ⣬µ«classpathÎÊÌâÈ´ÊÇjavaµÄÒ»¸öÖøÃûµÄÄÑÌâ¡£½ñÍíµÃÏÐÑо¿ÁËһϣ¬ÔÚÕâÀォÎÒµÄÑо¿³É¹û¸ú¸÷λ
ÅóÓÑ·ÖÏíһϡ£ÓÉÓÚͬ°üµÄÇé¿öºÜ¼òµ¥£¬ËùÒÔÕâÀï¾Í²»ÌÖÂÛͬ°üÇé¿ö£¬Ö»ÌÖÂÛ²»Í¬°üºÍ²»Í¬Â·¾¶µÄÇé¿ö¡£ÎªÁËÄÜÈöÁÕ߸üÈÝÒ×Àí½â£¬ÎÒÕâÀïÒÔ¾ÙÀýµÄ·½Ê½À´ËµÃ÷ÎÊ
Ìâ¡£
¡ ......
1. Multiply-Thread
Locks offer two primary features: mutual exclusion and visibility. Mutual exclusion means only one thread at a time may hold a given lock, so only one thread at a time will be using the shared data. Visibility is to ensure that changes made to shared data prior to releasing a lo ......
´úÂëÈçÏ£º
package com.test.j2se;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5 {
/**Êý¾Ý¼ÓÃÜ
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
MessageDigest code = MessageD ......