![33
]]TahrNTahrN_ ³_ ³ Vehicle classVehicle class ))
ankMnt;nUvankMnt;nUv instanceinstance variablesvariables
cMnYnbI KW ³cMnYnbI KW ³ passengers, fuelcappassengers, fuelcap
nignig mpgmpg..
class Vehicle {class Vehicle {
int passengers;int passengers; // number of passengers// number of passengers
int fuelcap;int fuelcap; // fuel capacity in gallons// fuel capacity in gallons
int mpg;int mpg; // fuel consumption// fuel consumption
// in miles per gallon// in miles per gallon
}}
edIm,IbegáItedIm,IbegáIt objectobject RbePTRbePTP](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-3-320.jpg)
![66
4>4> GMBIGMBI MethodMethod
TMrg;TUeTAénTMrg;TUeTAén methodmethod
mandUcxageRkamenH ³mandUcxageRkamenH ³
ret-type name(ret-type name(parameter-listparameter-list) {) {
// body of method// body of method
}}
]]TahrN_TahrN_ ³³
void range(){void range(){
System.out.println("Range is "System.out.println("Range is "
+ fuelcap * mpg);+ fuelcap * mpg);
P
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-6-320.jpg)
![77
eKGacbBaeKGacbBa
¢ÚntMéleTAkñúg¢ÚntMéleTAkñúg methodmethod ))
antamry³ )antamry³ )
a:ra:Em:Rtrbs;va.a:ra:Em:Rtrbs;va.
]]TahrNTahrN_ ³_ ³
double fuelneeded(int miles) {double fuelneeded(int miles) {
return (double) miles / mpg;return (double) miles / mpg;
}}
5>5> GMBIGMBI ConstructorConstructor
ConstructorConstructor
P
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-7-320.jpg)
![88
elIsBIenHelIsBIenH
vak¾BMumankareRbIBavak¾BMumankareRbIBa
kükü voidvoid dak;BImuxEdr.dak;BImuxEdr.
]]TahrNTahrN_ ³_ ³ class MyClass{class MyClass{
int x;int x;
MyClass(){MyClass(){
x = 10;x = 10;
}}
}}
6>6> kareRbIBakükareRbIBakü thisthis
kalNakalNa methodmethod
P
P
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-8-320.jpg)
![99
]]TahrNTahrN_ ³_ ³ class Pwr {class Pwr {
double b;double b;
int e;int e;
double val;double val;
Pwr(double base, int exp){Pwr(double base, int exp){
this.b = base;this.b = base;
this.e = exp;this.e = exp;
this.val = 1;this.val = 1;
if(exp == 0) return;if(exp == 0) return;
for( ; exp>0; exp--)for( ; exp>0; exp--)
this.val=this.val*base;this.val=this.val*base;
}}
double getPower(){double getPower(){
return this.val;return this.val;
}}
}}
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-9-320.jpg)
![1212
9>9> GMBIGMBI Overloading ConstructorsOverloading Constructors
dUcnwgdUcnwg methodmethod EdrEdr
enAkñúgenAkñúg classclass mYyGacmanmYyGacman
constructorsconstructors eRcIn)an.eRcIn)an.
]]TahrNTahrN_ ³_ ³ class A {class A {
int x;int x;
A(){A(){
x = 0;x = 0;
}}
A(int i){A(int i){
x = i;x = i;
}}
P
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-12-320.jpg)
![1313
10>10> karbkarbBa¢ÚBa¢ÚntMélCantMélCa obobjjectect
eTAeGayeTAeGay methodmethod
eKGacbBa¢ÚntMélCaeKGacbBa¢ÚntMélCa
objectobject eTAkñúgeTAkñúg methodmethod )an)an
dUcnwg)a:ra:Em:RtEdr.dUcnwg)a:ra:Em:RtEdr.
]]TahrNTahrN_ ³_ ³
vamanvaman methodsmethods BIrRbePTBIrRbePT
KW ³KW ³
P
P
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-13-320.jpg)
![1414
11>11> kareGaytMélCakareGaytMélCa objectsobjects
BIBI methodsmethods
MethodMethod
mYyGaceGaytMélCaRbemYyGaceGaytMélCaRbe
PTTinñn½yNamYyPTTinñn½yNamYy
rYmTaMgRbePTTinñn½yrYmTaMgRbePTTinñn½y
CaCa classclass pg.pg.
]]TahrNTahrN_ ³_ ³
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-14-320.jpg)
![1515
]]TahrN_TITahrN_TI 1 ³1 ³
int factR(int n) {int factR(int n) {
int result;int result;
if (n == 0 || nif (n == 0 || n ==== 1)1)
return 1;return 1;
else result = factR(n–1) * n;else result = factR(n–1) * n;
return result;return result;
}}
]]TahrN_TITahrN_TI 2 ³2 ³
int fibo(int n) {int fibo(int n) {
if ((n==1)||(n==2))if ((n==1)||(n==2))
return 1;return 1;
elseelse
return fibo(n-1)+fibo(n-2);return fibo(n-1)+fibo(n-2);
}}
P
P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-15-320.jpg)
![1818
]]TahrNTahrN_ ³_ ³
class Outer {class Outer {
int outer_x = 100;int outer_x = 100;
void test() {void test() {
for(int i=0; i<10; i++) {for(int i=0; i<10; i++) {
class Inner {class Inner {
void display() {void display() {
System.out.print("display: "System.out.print("display: "
+" outer_x = "+ outer_x);+" outer_x = "+ outer_x);
}}
}}
Inner inner = new Inner();Inner inner = new Inner();
inner.display();inner.display();
}}
}}
}}
P P](https://image.slidesharecdn.com/chapter5year2014-170225114530/85/chapter-5-Java-at-rupp-cambodia-18-320.jpg)
chapter 5 Java at rupp cambodia
- 1. 11 CMBUkTICMBUkTI 55 ³³ GMBIGMBI ClassClass nignig MethodsMethods 1> mU1> mUlldædæananRKRKWHénWHén ClassClass ClassClass KWCalMnaMmYyEdlkMntKWCalMnaMmYyEdlkMnt ;nUvTMrg;rbs;;nUvTMrg;rbs; objectobject mYy.mYy. ObjectsObjects KWCaKWCa instancesinstances énén classclass mYy.mYy.
- 2. 22 classclass classnameclassname {{ type instance-variable1;type instance-variable1; type instance-variable2;type instance-variable2; // ..// .. type methodname1(parameter-list)type methodname1(parameter-list) {{ // body of method// body of method }} type methodname2(parameter-list)type methodname2(parameter-list) {{ // body of method// body of method }} // …// … }} MethodsMethods nig GBaØat EdlmanenAknig GBaØat EdlmanenAk mYy ehAfamYy ehAfa membersmembers énén classclass..
- 3. 33 ]]TahrNTahrN_ ³_ ³ Vehicle classVehicle class )) ankMnt;nUvankMnt;nUv instanceinstance variablesvariables cMnYnbI KW ³cMnYnbI KW ³ passengers, fuelcappassengers, fuelcap nignig mpgmpg.. class Vehicle {class Vehicle { int passengers;int passengers; // number of passengers// number of passengers int fuelcap;int fuelcap; // fuel capacity in gallons// fuel capacity in gallons int mpg;int mpg; // fuel consumption// fuel consumption // in miles per gallon// in miles per gallon }} edIm,IbegáItedIm,IbegáIt objectobject RbePTRbePTP
- 4. 44 XøaxagelIenHXøaxagelIenH eKGacsresrCa ³eKGacsresrCa ³ Vehicle minivan;Vehicle minivan; minivan = new Vehicle();minivan = new Vehicle(); 3>3> GGBaØBaØatat referencereference nigkarkMnt;tMélnigkarkMnt;tMél (Reference Variables and Assignment)(Reference Variables and Assignment)
- 5. 55 RkeLkemIldMbUgRkeLkemIldMbUg vahak;dUcCagayKitfavahak;dUcCagayKitfa car1car1 nignig car2car2 bBa¢ak;eGaybBa¢ak;eGay objectsobjects BIrepSgKñaBIrepSgKña EttamBitenaHvaminEttamBitenaHvamin dUecñaHeT.dUecñaHeT. car1car1 nignig car2car2 bBa¢ak;eGaybBa¢ak;eGay objectobject dUcKña. karkMnt;tMéléndUcKña. karkMnt;tMélén car1car1 eTAeGayeTAeGay car2car2 eFVIeGayeFVIeGay
- 6. 66 4>4> GMBIGMBI MethodMethod TMrg;TUeTAénTMrg;TUeTAén methodmethod mandUcxageRkamenH ³mandUcxageRkamenH ³ ret-type name(ret-type name(parameter-listparameter-list) {) { // body of method// body of method }} ]]TahrN_TahrN_ ³³ void range(){void range(){ System.out.println("Range is "System.out.println("Range is " + fuelcap * mpg);+ fuelcap * mpg); P P
- 7. 77 eKGacbBaeKGacbBa ¢ÚntMéleTAkñúg¢ÚntMéleTAkñúg methodmethod )) antamry³ )antamry³ ) a:ra:Em:Rtrbs;va.a:ra:Em:Rtrbs;va. ]]TahrNTahrN_ ³_ ³ double fuelneeded(int miles) {double fuelneeded(int miles) { return (double) miles / mpg;return (double) miles / mpg; }} 5>5> GMBIGMBI ConstructorConstructor ConstructorConstructor P P
- 8. 88 elIsBIenHelIsBIenH vak¾BMumankareRbIBavak¾BMumankareRbIBa kükü voidvoid dak;BImuxEdr.dak;BImuxEdr. ]]TahrNTahrN_ ³_ ³ class MyClass{class MyClass{ int x;int x; MyClass(){MyClass(){ x = 10;x = 10; }} }} 6>6> kareRbIBakükareRbIBakü thisthis kalNakalNa methodmethod P P P
- 9. 99 ]]TahrNTahrN_ ³_ ³ class Pwr {class Pwr { double b;double b; int e;int e; double val;double val; Pwr(double base, int exp){Pwr(double base, int exp){ this.b = base;this.b = base; this.e = exp;this.e = exp; this.val = 1;this.val = 1; if(exp == 0) return;if(exp == 0) return; for( ; exp>0; exp--)for( ; exp>0; exp--) this.val=this.val*base;this.val=this.val*base; }} double getPower(){double getPower(){ return this.val;return this.val; }} }} P
- 10. 1010 7>7> karkarRbmRbmUlsMNl;UlsMNl; nignig finalizersfinalizers JavaJava manlkçN³bM)at;ecalnUvmanlkçN³bM)at;ecalnUv objectobject b¤ GBaØatNab¤ GBaØatNa EdlQb;eRbIecjBIEdlQb;eRbIecjBI memorymemory edays½VyRbvtþ.edays½VyRbvtþ. eKGaceRbIeKGaceRbI finalize() methodfinalize() method edIm,IeFVIskmµPaBedIm,IeFVIskmµPaB P
- 11. 1111 8>8> GMBIGMBI Method OverloadingsMethod Overloadings enAkñúgPasaenAkñúgPasa JavaJava vaGacmanvaGacman methodsmethods BIrBIr b¤eRcIn kñúgb¤eRcIn kñúg classclass mYyEdlmaneQµaHdUcKmYyEdlmaneQµaHdUcK ña EtmankarRbkas )ña EtmankarRbkas ) a:ra:Em:RtepSgKña b¤a:ra:Em:RtepSgKña b¤ mancMnYn)a:ra:Em:RtmimancMnYn)a:ra:Em:Rtmi nesµIKña.nesµIKña. P P
- 12. 1212 9>9> GMBIGMBI Overloading ConstructorsOverloading Constructors dUcnwgdUcnwg methodmethod EdrEdr enAkñúgenAkñúg classclass mYyGacmanmYyGacman constructorsconstructors eRcIn)an.eRcIn)an. ]]TahrNTahrN_ ³_ ³ class A {class A { int x;int x; A(){A(){ x = 0;x = 0; }} A(int i){A(int i){ x = i;x = i; }} P P
- 13. 1313 10>10> karbkarbBa¢ÚBa¢ÚntMélCantMélCa obobjjectect eTAeGayeTAeGay methodmethod eKGacbBa¢ÚntMélCaeKGacbBa¢ÚntMélCa objectobject eTAkñúgeTAkñúg methodmethod )an)an dUcnwg)a:ra:Em:RtEdr.dUcnwg)a:ra:Em:RtEdr. ]]TahrNTahrN_ ³_ ³ vamanvaman methodsmethods BIrRbePTBIrRbePT KW ³KW ³ P P P
- 14. 1414 11>11> kareGaytMélCakareGaytMélCa objectsobjects BIBI methodsmethods MethodMethod mYyGaceGaytMélCaRbemYyGaceGaytMélCaRbe PTTinñn½yNamYyPTTinñn½yNamYy rYmTaMgRbePTTinñn½yrYmTaMgRbePTTinñn½y CaCa classclass pg.pg. ]]TahrNTahrN_ ³_ ³ P
- 15. 1515 ]]TahrN_TITahrN_TI 1 ³1 ³ int factR(int n) {int factR(int n) { int result;int result; if (n == 0 || nif (n == 0 || n ==== 1)1) return 1;return 1; else result = factR(n–1) * n;else result = factR(n–1) * n; return result;return result; }} ]]TahrN_TITahrN_TI 2 ³2 ³ int fibo(int n) {int fibo(int n) { if ((n==1)||(n==2))if ((n==1)||(n==2)) return 1;return 1; elseelse return fibo(n-1)+fibo(n-2);return fibo(n-1)+fibo(n-2); }} P P
- 16. 1616 13>13> llkçkçN³N³ staticstatic MemberMember énén classclass mYymYy EdlmanlkçN³EdlmanlkçN³ staticstatic -- GaceRbI)anCamYyeQµaGaceRbI)anCamYyeQµa HH classclass edaymincaM)ac;manedaymincaM)ac;man karkekItkarkekIt objectobject CamuneLIy.CamuneLIy. -- manlkçN³cMlgtMél ¬manlkçN³cMlgtMél ¬shareshare P P
- 17. 1717 elIsBIenH eKeRbIelIsBIenH eKeRbI staticstatic blockblock edIm,IkMnt;tMéldMbUgedIm,IkMnt;tMéldMbUg mYycMnYn munnwgmYycMnYn munnwg objectsobjects begáIteLIg.begáIteLIg. 14>14> ClassClass mYyenAkñúgmYyenAkñúg classclass mYmYyeTotyeTot enAkñúgenAkñúg JavaJava eKGackMnt;eGaymaneKGackMnt;eGayman classclass P
- 18. 1818 ]]TahrNTahrN_ ³_ ³ class Outer {class Outer { int outer_x = 100;int outer_x = 100; void test() {void test() { for(int i=0; i<10; i++) {for(int i=0; i<10; i++) { class Inner {class Inner { void display() {void display() { System.out.print("display: "System.out.print("display: " +" outer_x = "+ outer_x);+" outer_x = "+ outer_x); }} }} Inner inner = new Inner();Inner inner = new Inner(); inner.display();inner.display(); }} }} }} P P
- 19. 1919 kalNaeKbegáItkalNaeKbegáIt classclass mYyenAkñúgmYyenAkñúg classclass mYyeTotmYyeTot ehIyehIy classclass kñúgBMu)anbegáItkñúgBMu)anbegáIt objectobject enAkñúgenAkñúg classclass eRkAeRkA eTenaHeTenaH eKGaccUleTAeRbIeKGaccUleTAeRbI membersmembers rbs;rbs; classclass kñúg tamry³kñúg tamry³ objectobject enAkMriténenAkMritén classclass kñúgenaH.kñúgenaH. P
- 20. 2020 1 -1 - etIetI constructorconstructor CaGVI?CaGVI? etIvaRbtibtþienAeBlNa ?etIvaRbtibtþienAeBlNa ? 2 -2 - cUrBnül;BIPaBxusKñarvacUrBnül;BIPaBxusKñarva gg classclass nignig objectobject.. 3 -3 - cUrniyayBIlkçN³cUrniyayBIlkçN³ staticstatic EdleRbICamYynwgEdleRbICamYynwg membersmembers sMnYrsMnYr nignig lMhat;lMhat;
- 21. 2121 5 -5 - cUrbegáItcUrbegáIt classclass mYyeQµaHmYyeQµaH RectangleRectangle.. ClassClass enH manlkçN³BIrKWenH manlkçN³BIrKW beNþay ¬beNþay ¬widthwidth¦ nig TTwg¦ nig TTwg ¬¬heightheight¦ ehIytMél¦ ehIytMél defaultdefault rbs;varbs;va KWesµInwgKWesµInwg 11. vaman. vaman methodmethod EdlGacKNnabrimaRtEdlGacKNnabrimaRt nigRkLaépÞénctuekaNEknigRkLaépÞénctuekaNEk g. ehIyvak¾mang. ehIyvak¾man methodsmethods
- 22. 2222 6 -6 - cUrsresrkmµviFImYyedIm,cUrsresrkmµviFImYyedIm, IbgðajBIkarcUleRbIIbgðajBIkarcUleRbI membermember énén inner classesinner classes TaMgGs;EdlmanTMrg;dUTaMgGs;EdlmanTMrg;dU cxageRkam ³cxageRkam ³ class AA {class AA { int x = 10;int x = 10; class BB {class BB { int y = 20;int y = 20; int xy( ){ return x+y; }int xy( ){ return x+y; }