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ҵJavaԱⷶ
ƽʱѧϰУǶɱҪӴ⣬Լ鿼ǷѾ߱ijʸĻʲôЧأСΪռҵJavaԱⷶģϣԴ
ҵJavaԱⷶ1
1IPַıΪ֣
IPַɣźšҪ͡롱λ֮ЩλЩλ
2ûMNֵ1Nʼ˳ѭÿMֱֵȫдC
ѭȡ
3switchIJǣ
switchIJΪʵ͡
4 staticʲô;˵֣
aƱ
bñĴ洢
7ָʲô
añ뱻ʼָ벻ء
bóʼԺܱı䣬ָԸıָĶ
cֵָãǴֵָָ롣
8ʵʱϵͳĻ
ضʱضʵʱɿ
9ȫֱ;ֲڴǷУʲô
ȫֱھ̬ݿ⣬ֲڶջ
10ʲôƽ
ƽȲֵľֵ1
11ջһʲôԭµ`
ûлԴ
12ʲôΪ麯
constructor
13ð㷨ʱ临Ӷʲô
On^2
14дfloat x롰ֵȽϵif䡣
ifx>0000001&&x<0000001
16InternetЭ飿ЭҪνṹ
tcp/ipӦò///·/
17InternetַIPַתʲôЭ飿
ARPAddress Resolution ProtocolַЭ飩
ҵJavaԱⷶ2
1mainΪprivate
룬еʱʾmainpublicġ
2JavaĴúʹֵʲô
ָݵǵֵֵַǴֵһݿ
3ҪдһequalsҪʲô
hashCode
4JavaġһαдСʵֵģ
JavaᱻֽɵclassļЩֽκƽ̨Javaƽ̨Ķ
Java
5˵һpublic static void mainString args[]ÿؼֵá
publicmainJavaʱõĵһJavaɼԿɼΪpulic
staticJavaƽ̨ʱᴴһʵΪstatic
voidmainûзֵ
Stringдͣargsָдַ顣
6==equals
==ȽڴDzͬһ˵ڴĴ洢λһ¡String洢ֵһģпڴ洢ڲͬĵط
==ȽϵöequalsȽϵݡpublic boolean equalsObject objObjectṩģдĬϵʵֻебȽʱŻ᷵trueʱ==ǵȼ۵`StringBitSetDateFileequalsдStringԣֵζǰַͬСڻ͵İװ˵ֵζŶӦĻ͵ֵһ
7ȥmainstaticη
롣ʱNoSuchMethodError쳣
8Ϊʲôoracle type4
oracleṩһtype 4 JDBCΪһoracleԼȫJavaʵֵһTCP/IPNet8ʵ֣ƽ̨Ķʱأκοͻ˵oracleʵ֡ͻַõTCP/IPĵַ˿ڣݿtnsname
9һfinalize
final finally쳣 finalizeա
ӿıĬfinalġfinal̳УҲûࡣôdzڻ͵İȫǣStringIntegerҲʹñһЩŻױ̵֤߳İȫԡfinalдfinalֵܸı䡣finalizeһٺͻǰᱻáfinallyͨ쳣û쳣׳ִе磬رͨŵfinallyɡ
10ʲôJava API
Java APIǴļϣṩ˴õĹܣGUI
11GregorianCalendarʲô
GregorianCalendarṩͳ֧֡
12ResourceBundleʲô
ResourceBundle洢ָԻԴӦóԸʱԻЩԴӶṩͬԵչʾ
13ΪʲôJavaûȫֱ
ȫֱȫֿɼģJava֧ȫֿɼıΪȫֱƻԭȫֱռijͻ
14νStringתNumberͣ
IntegervalueOfԽStringתNumber
15SimpleTimeZoneʲô
SimpleTimeZoneṩ֧֡
16whileѭdoѭʲôͬ
whileṹѭĿʼжһǷӦüdo/whileṹѭĽβжǷһֵdoṹٻִһѭ塣
17Localeʲô
LocaleԻ̬
18̵ԭʲô
Ҫ㣬̬̳кͷװ
19¼̳еԭ
̳ʹһԻȡһԡʹü̳пѾ걸ĹܵԸãҿһģм̳еĵطͬʱЧ
20ʲôʽת
ʽתǼһֵһͣûʽĸ߱תеͶ֧ʽת
21sizeofJavaĹؼ
ǡ
22nativeʲô
nativeǷJavaʵֵķ
23Systemoutprintln棬Systemoutprintlnֱʲô
SystemϵͳṩԤfinal࣬outһPrintStreamprintlnoutһصķ
24װ̳кͶ̬ʲô
˵ָ̬һֶʵ̬֡ʹһʵͨһͨõķʽʵֲͬIJIJʵʵʵġ
̬Javaֱַʽ̳ͨʵַдͨJavaӿڽзд
25ʽתʲô
ʽתȷ˱жת
26ʲôJava
JavaֲͬӲƽ̨ϵϵͳ
27תʲô
תָһͨתһͣڼ̳нṹ½С
28Javaķηʲô
ȨηDZԱķȨ͵Ĺؼ֡ʹЩؼķ߱ķȨޡǰ
publicԷprotectedͬһԼԷprivateֻйܷĬϣ༰ͬµԷʡ
29ĸʲô
Object
30JavaĻЩ
bytecharshortintlongfloatdoubleboolean
ҵJavaԱⷶ3
1JavaϿʲô˵һЩϿܵŵ㣿
ÿֱжмϣJava汾ּࣺVectorStackHashTableArray
żϵĹ㷺ʹãJava12мϽӿڡʵֺ㷨ļϿܡڱ֤̰߳ȫʹ÷ͺͲ࣬JavaѾ˺ܾáJavaУӿԼǵʵ֡
ϿܵIJŵ£
1ʹúļཱུͿɱʵԼļࡣ
2ʹþϸԵļϿ࣬õߡ
3ͨʹJDKļ࣬Խʹάɱ
4ԺͿɲԡ
2Ͽеķʲôŵ㣿
Java15˷ͣеļϽӿںʵֶʹΪṩһɵĶͣˣ͵κԪأڱʱʱClassCastExceptionΪ㽫ڱʱõϢ
Ҳʹô࣬DzҪʹʽתinstanceOfҲʱôΪͼָֽ
3JavaϿܵĻӿЩ
CollectionΪϲ㼶ĸӿڡһϴһЩΪԪءJavaƽ̨ṩӿκֱӵʵ֡
SetһܰظԪصļϡӿڶѧϳнģϣһơ
ListһϣظԪءͨκԪءListȶ̬任顣
Mapһkeyӳ䵽valueĶһMapܰظkeyÿkeyֻӳһvalue
һЩĽӿQueueDequeueSortedSetSortedMapListIterator
4ΪCollectionCloneableSerializableӿڼ̳У
CollectionӿָһΪԪءάЩԪCollectionľʵ־
磬һЩListCollectionʵظԪأSetͲܶCollectionʵһеcloneȻŵϵʵҲûġΪCollectionһ֡Ҫʵ֡
ʵִʱ¡лͺŷáԣʵӦþζп¡лǷԱ¡л
еʵȨ¡лյ¸ٵԺơضʵӦþǷԱ¡л
5ΪMapӿڲ̳Collectionӿڣ
MapӿںʵҲǼϿܵһ֣MapǼϣҲMapˣMap̳Collection壬֮Ȼ
Map̳CollectionӿڣôԪȥĶMapkeyvalueԣṩȡkeyvalueбϵķʺϡһ淶
6Iteratorʲô
IteratorӿṩκCollectionĽӿڡǿԴһCollectionʹõȡʵȡJavaϿеEnumerationڵƳԪء
7EnumerationIteratorӿڵ
EnumerationٶIteratorҲʹøٵ`ڴ档EnumerationǷdzģҲ˻ҪǣEnumerationȣIteratorӰȫΪһڱʱֹ߳ȥļϡ
ȡJavaϿеEnumerationߴӼƳԪأEnumerationΪʹĹܸѾơ
8ΪûIteratoraddķԪأ
岻֪ǣIteratorЭ鲻ȷĴȻҪע⣬ListIteratorûṩһaddҪȷ˳
9ΪεûһֱӻȡһԪأҪƶαꣿ
ڵǰIteratorĶʵ֣õú٣ӵӿУÿ̳жҪȥʵû塣
10IteraterListIterator֮ʲô
1ǿʹIteratorSetListϣListIteratorֻܱList
2IteratorֻǰLIstIterator˫
3ListIteratorIteratorӿڼ̳УȻһЩĹܣһԪء滻һԪءȡǰԪصλá
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