JAVA½Ó¿ÚµÄ¸ÅÄî¼°ÖÖÀà
Ò»¸öJava½Ó¿Ú(Interface)ÊÇһЩ·½·¨ÌØÕ÷µÄ¼¯ºÏ£¬ÕâЩ·½·¨ÌØÕ÷µ±È»À´×ÔÓÚ¾ßÌåµÄ·½·¨£¬µ«ÊÇËüÃÇÒ»°ã¶¼À´×ÔÓÚϵͳÖв»¶Ï³öÏֵķ½·¨¡£Ò»¸ö½Ó¿ÚÖ»Óз½·¨µÄÌØÕ÷£¬¶øûÓз½·¨µÄʵÏÖ£¬Òò´ËÕâЩ·½·¨ÔÚ²»Í¬µÄµØ·½±»ÊµÏÖʱ£¬¿ÉÒÔÓÐÍêÈ«²»Í¬µÄÐÐΪ¡£ÔÚJavaÓïÑԵģ¬Java½Ó¿Ú»¹¿ÉÒÔ¶¨ÒåPublic³£Á¿¡£
1¡¢µ¥·½·¨½Ó¿Ú
public interface ActionListener
{
public abstract void actionPerformed(ActionEvent event);
}
2¡¢±êʶ½Ó¿Ú
±êʶ½Ó¿ÚÊÇûÓÐÈκη½·¨ºÍÊôÐԵĽӿÚ.±êʶ½Ó¿Ú²»¶ÔʵÏÖËüµÄÀàÓÐÈκÎÓïÒåÉϵÄÒªÇó£¬Ëü½ö½ö±íÃ÷ʵÏÖËüµÄÀàÊôÓÚÒ»¸öÌض¨µÄÀàÐÍ¡£
package java.io;
public interface Serializable{};
3¡¢³£Á¿½Ó¿Ú
Ëùν³£Á¿½Ó¿Ú£¬ÊÇÖ¸ÓÃJava½Ó¿ÚÀ´ÉùÃ÷һЩ³£Á¿£¬È»ºóÓÉʵÏÖÕâ¸ö½Ó¿ÚµÄÀàʹÓÃÕâЩ³£Á¿¡£
public interface AppConstants
{
public static final DATA_SOURCE_NAME="test";
public static final USER_NAME="test";
public static final PASSWORD="test";
}
Ïà¹ØÎĵµ£º
ÍøÉÏ¿´µ½Ò»Ð©¸Õ¿ªÊ¼Ñ§»òÊÇ»¹Ã»ÓпªÊ¼Ñ§javaµÄͬѧ£¬¾³£ÎÊ£º“Õâ¸öjava£¬ÎÒ¸ÃÔõôѧ£¬Ñ§Ê²Ã´ÄØ£¿”£¬ÎÒÏë¸øËûÃÇ˵һÏ¡£¿ÉÊÇÎÒµÄÄÜÁ¦ÓÐÏÞ¡£ËùÒÔÎÒÒ²²»ºÃ¶Ôij¸öͬѧ¾ßÌåµÄ˵ʲô£¬¿ÉÊÇ£¬½ñÌìÔÚÍøÉÏ¿´µ½Ò»ÕÅͼƬ¡£¸Ð¾õ¶Ô´ó¼ÒÌá³öµÄÕâ¸öÎÊÌâÓиöºÜºÃµÄ½âÊÍ˵Ã÷¡£
  ......
JavaºÍÆäËûÓïÑÔ²»Í¬µÄÊÇ£¬JavaÊÇÔËÐÐÓÚJavaÐéÄâ»ú(JVM)¡£Õâ¾ÍÒâζ×űàÒëºóµÄ´úÂëÊÇÒÔÒ»ÖÖºÍƽ̨Î޹صĸñʽ±£´æµÄ£¬¶ø²»ÊÇijÖÖÌض¨µÄ»úÆ÷ÉÏÔËÐеĸñʽ¡£ÕâÖÖ¸ñʽºÍ´«Í³µÄ¿ÉÖ´ÐдúÂë¸ñʽÓкܶàÖØÒªµÄÇø±ð¡£¾ßÌåÀ´Ëµ£¬²»Í¬ÓÚC»òÕߣÃ++³ÌÐò£¬Java³ÌÐò²»ÊÇÒ»¸ö¶ÀÁ¢µÄ¿ÉÖ´ÐÐÎļþ£¬¶øÊÇÓɺܶà·Ö¿ªµÄÀàÎļþ×é³É£¬Ã¿¸öÀàÎļþ¶ÔÓ¦Ò»¸ö ......
SAMPLE£º
import java.util.Properties;
Properties props=System.getProperties(); //»ñµÃϵͳÊôÐÔ¼¯
String osName = props.getProperty("os.name"); //²Ù×÷ϵͳÃû³Æ
String osArch = props.getPropert ......
8.9.3 ³éÏóÀàºÍ½Ó¿ÚµÄ±È½Ï
³éÏóÀàºÍ½Ó¿Ú¶¼ÊǽøÐÐÃæÏò¶ÔÏóÉè¼ÆʱרÓõÄÉè¼Æ½á¹¹£¬ÔÚʵ¼Ê½øÐÐÏîÄ¿Éè¼Æʱ£¬¾³£ÐèÒª¿¼ÂǵÄÎÊÌâ¾ÍÊÇ——“ʹÓóéÏóÀ໹Êǽӿڔ£¿ÏÂÃæͨ¹ý¶ÔÓÚ³éÏóÀàºÍ½Ó¿Ú½øÐмòµ¥µÄ±È½Ï£¬ÊìϤÁ½ÕßÖ®¼äµÄÇø±ðºÍÁªÏµ£¬´Ó¶øÔÚʵ¼ÊÉè¼ÆÊ±Ê ......