·¢²¼Ê±¼ä : ÐÇÆÚÒ» ÎÄÕ¡¶Java»ù´¡ÈëÃÅ¡·¿ÎºóÏ°Ìâ¼°´ð°¸¸üÐÂÍê±Ï¿ªÊ¼ÔĶÁa43a92e716fc700abb68fce3
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
2£©ChildÀàΪFatherÀàµÄÄÚ²¿À࣬ÆäÖж¨ÒåÒ»¸öintroFather()·½·¨£¬·½·¨Öе÷ÓÃFatherÀàµÄnameÊôÐÔ¡£
3£©¶¨ÒåÒ»¸ö²âÊÔÀàTest£¬ÔÚTestÀàµÄmain()·½·¨ÖУ¬´´½¨Child¶ÔÏ󣬲¢µ÷ÓÃintroFather ()·½·¨¡£
µÚ4Õ ÃæÏò¶ÔÏó£¨Ï£©
Ò»¡¢Ìî¿ÕÌâ
1¡¢ÔÚJavaÓïÑÔÖУ¬ÔÊÐíʹÓÃÒÑ´æÔÚµÄÀà×÷Ϊ»ù´¡´´½¨ÐµÄÀ࣬ÕâÖÖ¼¼ÊõÎÒÃdzÆΪ¼Ì³Ð______¡£ 2¡¢Ò»¸öÀàÈç¹ûʵÏÖÒ»¸ö½Ó¿Ú£¬ÄÇôËü¾ÍÐèҪʵÏÖ½Ó¿ÚÖж¨ÒåµÄÈ«²¿_·½·¨_____£¬·ñÔò¸ÃÀà¾Í±ØÐ붨Òå³É_³éÏóÀà_____¡£
3¡¢ÔÚ³ÌÐò¿ª·¢ÖУ¬ÒªÏ뽫һ¸ö°üÖеÄÀർÈëµ½µ±Ç°³ÌÐòÖУ¬¿ÉÒÔʹÓÃ_import_____¹Ø¼ü×Ö¡£ 4¡¢Ò»¸öÀà¿ÉÒÔ´ÓÆäËüµÄÀàÅÉÉú³öÀ´£¬ÅÉÉú³öÀ´µÄÀà³ÆΪ_×ÓÀà_____£¬ÓÃÓÚÅÉÉúµÄÀà³ÆΪ_»ùÀà_____»òÕß__¸¸Àà____¡£
5¡¢ JDKÖж¨ÒåÁË´óÁ¿µÄÒì³£À࣬ÕâЩÀ඼ÊÇ_Exception_____ÀàµÄ×ÓÀà»òÕß¼ä½Ó×ÓÀà¡£ 6¡¢¶¨ÒåÒ»¸öJavaÀàʱ£¬Èç¹ûÇ°Ãæ¼ÓʹÓÃ_final_____¹Ø¼ü×ÖÐÞÊΣ¬ÄÇô¸ÃÀ಻¿ÉÒÔ±»¼Ì³Ð¡£ 7¡¢Èç¹û×ÓÀàÏëʹÓø¸ÀàÖеijÉÔ±£¬¿ÉÒÔͨ¹ý¹Ø¼ü×Ö__super____ÒýÓø¸ÀàµÄ³ÉÔ±¡£ 8¡¢ÔÚJavaÓïÑÔÖУ¬ËùÓеÄÀ඼ֱ½Ó»ò¼ä½Ó¼Ì³Ð×Ô_Object_____Àà¡£
9¡¢Òì³£µÄ²¶»ñͨ³£ÓÉtry¡¢catchÁ½²¿·Ö×é³É£¬_try_____´úÂë¿éÓÃÀ´´æ·Å¿ÉÄÜ·¢ÉúÒì³££¬_catch_____
´úÂë¿éÓà À´´¦Àí²úÉúµÄÒì³£¡£
10¡¢ÔÚJavaÓïÑÔÖУ¬ÒªÏëÊǽ«Ò»¸öÒѱàÒëµÄÀà´ò°ü³ÉjarÎļþ£¬¿ÉÒÔʹÓõÄÃüÁîÊÇ_jar-cvf_____£¬Òª
ÏëÔÚÃüÁîÐд°¿ÚÔËÐÐjarÎļþ£¬¿ÉÒÔʹÓõÄÃüÁîÊÇ__java-jar___¡£
¶þ¡¢ÅжÏÌâ
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
1¡¢³éÏó·½·¨±ØÐ붨ÒåÔÚ³éÏóÀàÖУ¬ËùÒÔ³éÏóÀàÖеķ½·¨¶¼ÊdzéÏó·½·¨¡£´í 2¡¢JavaÖб»final¹Ø¼ü×ÖÐÞÊεıäÁ¿£¬²»Äܱ»ÖØи³Öµ¡£¶Ô 3¡¢²»´æÔڼ̳йØϵµÄÇé¿öÏ£¬Ò²¿ÉÒÔʵÏÖ·½·¨ÖØд¡£´í 4¡¢packageÉùÃ÷Óï¾äÓ¦µ±ÎªJavaÔ´ÎļþÖеĵÚÒ»ÌõÓï¾ä¡£¶Ô 5¡¢½Ó¿ÚÖÐÖ»Äܶ¨Òå³£Á¿ºÍ³éÏó·½·¨¡£´í(¶Ô) Èý¡¢Ñ¡ÔñÌâ
1¡¢ÔÚÀàµÄ¼Ì³Ð¹ØϵÖУ¬ÐèÒª×ñÑÒÔÏÂÄĸö¼Ì³ÐÔÔò£¿B
A¡¢¶àÖØ B¡¢µ¥Ò» C¡¢Ë«ÖØ D¡¢²»Äܼ̳Р2¡¢ÔÚJavaÓïÑÔÖУ¬ÒÔÏÂÄĸö¹Ø¼ü×ÖÓÃÓÚÔÚ·½·¨ÉÏÉùÃ÷Å׳öÒì³££¿C
A.try B.catch C.throws D.throw
3¡¢¹ØÓÚsuper¹Ø¼ü×ÖÒÔÏÂ˵·¨ÄÄЩÊÇÕýÈ·µÄ£¿£¨¶àÑ¡£©ABD£¨ABC£©
A¡¢super¹Ø¼ü×Ö¿ÉÒÔµ÷Óø¸ÀàµÄ¹¹Ôì·½·¨ B¡¢super¹Ø¼ü×Ö¿ÉÒÔµ÷Óø¸ÀàµÄÆÕͨ·½·¨ C¡¢superÓëthis²»ÄÜͬʱ´æÔÚÓÚͬһ¸ö¹¹Ôì·½·¨ÖÐ D¡¢superÓëthis¿ÉÒÔͬʱ´æÔÚÓÚͬһ¸ö¹¹Ôì·½·¨ÖÐ 4¡¢ÒÔÏÂ˵·¨ÄÄЩÊÇÕýÈ·µÄ£¿£¨¶àÑ¡£©ABCD
A¡¢JavaÓïÑÔÖÐÔÊÐíÒ»¸öÀàʵÏÖ¶à¸ö½Ó¿Ú B¡¢JavaÓïÑÔÖв»ÔÊÐíÒ»¸öÀà¼Ì³Ð¶à¸öÀà
C¡¢JavaÓïÑÔÖÐÔÊÐíÒ»¸öÀàͬʱ¼Ì³ÐÒ»¸öÀಢʵÏÖÒ»¸ö½Ó¿Ú D¡¢JavaÓïÑÔÖÐÔÊÐíÒ»¸ö½Ó¿Ú¼Ì³ÐÒ»¸ö½Ó¿Ú
5¡¢ÀàÖеÄÒ»¸ö³ÉÔ±·½·¨±»ÏÂÃæÄĸöÐÞÊηûÐÞÊΣ¬¸Ã·½·¨Ö»ÄÜÔÚ±¾Àà±»·ÃÎÊ£¿C
A¡¢public B¡¢ protected C¡¢ private D¡¢default 6¡¢¹ØÓÚ³éÏóÀàµÄ˵·¨ÄÄЩÊÇÕýÈ·µÄ£¿£¨¶àÑ¡£©AC
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
A¡¢³éÏóÀàÖпÉÒÔÓзdzéÏó·½·¨¡£
B¡¢Èç¹û¸¸ÀàÊdzéÏóÀ࣬Ôò×ÓÀà±ØÐëÖØд¸¸ÀàËùÓеijéÏó·½·¨¡£ C¡¢²»ÄÜÓóéÏóÀàÈ¥´´½¨¶ÔÏó¡£ D¡¢½Ó¿ÚºÍ³éÏóÀàÊÇͬһ¸ö¸ÅÄî¡£
7¡¢ÔÚJavaÖУ¬ÒªÏëÈÃÒ»¸öÀà¼Ì³ÐÁíÒ»¸öÀ࣬¿ÉÒÔʹÓÃÒÔÏÂÄĸö¹Ø¼ü×Ö£¿C
A¡¢inherits B¡¢implements C¡¢extends D¡¢modifies 8¡¢SystemÀàλÓÚÒÔÏÂÄĸö°üÖУ¿D
A¡¢java.io B¡¢java.util C¡¢java.awt D¡¢java.lang 9¡¢ÒÑÖªÀàµÄ¼Ì³Ð¹ØϵÈçÏ£º A
class Employee;
class Manager extends Employee; class Director extends Employee; ÔòÒÔÏÂÓï¾äÄÜͨ¹ý±àÒëµÄÓÐÄÄЩ£¿
A¡¢ Employee e=new Manager(); B¡¢ Director d=new Manager(); C¡¢ Director d=new Employee(); D¡¢Manager m=new Director(); 10¡¢±àÒëÔËÐÐÏÂÃæµÄ³ÌÐò£¬½á¹ûÊÇʲô£¿B
public class A { }
class B extends A { }
void test() { }
super.test();
System.out.print(\
public static void main(String[] args) { }
void test() { }
System.out.print(\B b = new B(); b.test();
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
A¡¢²úÉú±àÒë´íÎó B¡¢´úÂë¿ÉÒÔ±àÒëÔËÐУ¬²¢Êä³ö½á¹ûAB C¡¢´úÂë¿ÉÒÔ±àÒëÔËÐУ¬µ«Ã»ÓÐÊä³ö D¡¢±àÒëûÓдíÎ󣬵«»á²úÉúÔËÐÐʱÒì³£
ËÄ¡¢·ÖÎöÌâ
ÔĶÁÏÂÃæµÄ³ÌÐò£¬·ÖÎö´úÂëÊÇ·ñÄܱàÒëͨ¹ý£¬Èç¹ûÄܱàÒëͨ¹ý£¬ÇëÁгöÔËÐеĽá¹û¡£Èç¹û²»ÄܱàÒëͨ¹ý£¬Çë˵Ã÷ÔÒò¡£ ´úÂëÒ»£º½øÈëcatch´úÂë¿é
½øÈëfinally´úÂë¿é(³ÌÐò±àÒëÄÜͨ¹ý£¬ÕâÊÇÒòΪint x = 2 / 0; System.out.println(x);ÕâÁ½ÌõÓï¾äʹÓÃÁËtry¿é£¬²¶»ñÁ˳ÌÐòÒòΪ³ýÒÔ0¶ø²úÉúµÄÒì³£Çé¿ö£¬Ö®ºó³ÌÐò»á¼ÌÐøÏòÏÂÖ´ÐУ¬Êä³ö¡°½øÈëcatch´úÂë¿é¡±£¬¡°½øÈëfinally´úÂë¿é¡±¡£)
public class Test01 {
public static void main(String[] args) { }
try {
int x = 2 / 0;
System.out.println(x);
} catch (Exception e) { }
System.out.println(\½øÈëcatch´úÂë¿é\System.out.println(\½øÈëfinally´úÂë¿é\} finally {
}
´úÂë¶þ£º²»ÄÜ£¬finalÐÞÊÎshout,²»Äܱ»ÖØд(³ÌÐò±àÒ벻ͨ¹ý£¬ÕâÊÇÒòΪÔÚ³ÌÐòÖÐʹÓÃÁËfinal¹Ø¼ü×ÖÐÞÊÎAnimalÀ࣬ʹµÃAnimalÀ಻Äܱ»¼Ì³Ð¡£shout()·½·¨ÖÐͬÑùʹÓÃÁËfinal¹Ø¼ü×Ö£¬Ê¹µÃ¸Ã·½·¨²»Äܱ»ÖØд¡£)
final class Animal { }
class Dog extends Animal {
public void shout() {
// ³ÌÐò´úÂë
public final void shout() { }
// ³ÌÐò´úÂë