C BN V JAVA1

NHM 1Tn L T Chu Nguyn Th Ngc Hn Nguyn Th Ngc Hng Nguyn Th Thy H MSSV 070051T 070079T 070081T 070084T

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LP TRNH HNG I TNG3

LP TRNH HNG I TNG

Lp trnh hng i tng cp n d liu v th tc x l d liu theo quan im l mt i tng duy nht. Lp trnh hng i tng xem xt d liu nh l mt thc th hay l mt n v c lp, vi bn cht ring v nhng c tnh ca thc th y

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TNH CHT

Tru tng (abstraction) Tnh ng gi (encapsulation) v che giu thng tin (information hiding) Tnh a hnh (polymorphism) Tnh k tha (inheritance)

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I TNG

VD: Thc th trong th gii thc l xe t. Mt s c im lin quan n xe t l: Mu Cu

to Kiu dng

Mt s hnh ng lin quan n xe t l: Li Tng

ga Gim ga p thng

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I TNG PHN MM

L bn sao ca i tng trong th gii thc, mt i tng phn mm c :

Trng thi ca i tng phn mm lin quan n cc c tnh hoc thuc tnh ca n . Hnh vi ca i tng phn mm bao gm cc hnh ng ca n.7

NH NGHA LP

Trong th gii thc, mt vi i tng c cng chung trng thi v hnh vi c th c nhm li di mt lp. VD: Mt xe t (bt k l xe no) l mt lp v mt xe Toyota (mt xe c th) l mt i tng hoc th nghim ca lp.

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SO SNH GIA LP V I TNG

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GII THIU NGN NG JAVA10

S PHT TRIN

S pht trin (s lc) 1991:

Ra i vi tn Oak vi d nh thay cho C+

+ Tiu Java

ch "Write Once, Run Anywhere" (WORA). c pht hnh vo nm 1994

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C IM

Ngn ng lp trnh JAVA Hng

i tng c lp nn Mnh m Bo mt Phn tn a lung

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CNG CB cng c pht trin JAVA (JDK) cung cp phn mm v cc cng c c yu cu cho vic bin dch, kim tra li v thc thi cc chng trnh Java. Java Standard Editon(Java SE), l cng ngh v nn m cung cp h tr xy dng cc ng dng c cc chc nng cao, tc v ng tin cy. B pht trin Java SE(JDK), bao gm cc cng c pht trin cn thit, mi trng thc thi, v cc API cho vic to ra cc chng trnh Java vi nn Java. JDK bao gm hai cng c quan trng: javac (b bin dch) java (b thng dch)13

CC LOI CHNG TRNH JAVAApplets ng dng c lp (console Application) ng dng giao din (GUI Application) Servlet ng dng c s d liu

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CC PHN T C BN TRONG JAVATng t nh C/C++ Lp v phng thc (Classes & Methods) Kiu d liu Bin s Ton t Cu trc iu khin

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GIL ni t chc cc lp v cc giao din. Cc chng trnh Java c t chc nh nhng tp ca cc gi. Mi gi gm c nhiu lp, v/hoc cc giao din c coi nh l cc thnh vin ca n. u im: Cho php t chc cc lp vo nhng n v nh hn Gip trnh c tnh trng trng lp khi t tn. Cho php bo v cc lp i tng Tn gi (Package) c th c dng nhn dng chc nng ca cc lp. Cc gi cng c th cha cc gi khc

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CC GI THNG DNGjava.lang: Mc nh lun c. java.io: Bao gm cc lp tr gip cho cc thao tc vo ra. ). Tng ng vi th vin trong C/C++. java.applet: Bao gm cc lp thc thi mt applet trong trnh duyt. java.awt: Cc thnh phn xy dng giao din ha(GUI). N tng ng vi th vin trong C/C++. java.util: Cung cp nhiu lp v nhiu giao din tin ch, nh cu trc d liu, lch, ngy thng,

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CC GI TRONG JAVAjava.net: Cung cp cc lp v cc giao din cho vic lp trnh mng TCP/IP. java.awt.event java.rmi java.security java.sql

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JAVA.LANGLp Lp Lp Lp Lp Lp Lp

String StringBuffer Math Runtime System Class Object

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JAVA.UTILLp Lp Lp Lp

Hashtable Random Vector StringTokenizer

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JAVA.IO RandomAccesFile InputStream FileInputStream OutputStream ByteArrayInputStream FileOutputStream ByteArrayOutputStream BufferedInputStream BufferedOutputStream File SequenceInputStream FileDescriptior IOException

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S KHC BIT VI C/C++Tc bin dch Comment java doc Mi th u thuc mt lp Tt c cc nh ngha v phng thc u phi c nh ngha trong thn mt lp.

K c hm main cng thuc mt lp ring bit. VD: public class RelationalDemo { public static void main(String[ ] args) { } }

Trong Java khng c ton t phn gii phm vi ::

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S KHC BIT VI C/C++Cc th vin c chia thnh cc gi (packet) v phi c khai bo trc khi np vo import th vin thay v #include Mi kt qu ca biu thc u phi c gn Java khng c kiu con tr hon ton. Kiu d liu trong Java nht qun cho tt c cc HH v phn cng khc nhau. Java c ring mt th vin cc lp c s. Trong chng trnh Java khng phi bn tm n vic cp pht b nh. Qa trnh cp pht, gii phng c thc hin t ng.

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NH DNG XUT

C php:System.out.printf( m nh dng,bin);

Lp java.lang.System nh ngha cc lung nhp v xut chun Lung I/O bao gm: Lp

System.out: Lung xut chun dng hin th kt qu trn mn hnh. Lp System.in: Lung nhp chun thng n t bn phm v c dng c cc k t d liu.

M nh dng c dnh ngha tng t ngn ng C/C++: %d,%f, %o, %e, %n24

NH DNG NHPC php: Scanner input = new canner(System.in); Input l mt i tng ca lp Scanner v, System.in l mt i tng dng u vo. Lp Scanner thuc gi java.util

VD: Scanner s=new Scanner(System.in); byte byteValue=s.nextByte(); int intValue=s.nextInt(); System.out.println(Nhap gia tri bien:); System.out.println(byteValue + + intValue); Xut ra: Nhap gia tri bien: 121 233325

V D MT CHNG TRNH JAVA MU

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BIN DCH CHNG TRINH JAVA

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Demo chng trnh c bnpackage javaapplication5; import java.util.Scanner; //Them thu vien cho lop scanner public class Main { public static void main(String[ ] args) { int a; int b; int c; System.out.println("Nhap a= "); Scanner scan=new Scanner(System.in); a= scan.nextInt(); System.out.println("Nhap b= "); b=scan.nextInt(); c=a+b; if(c