review konsep java

1.Tujuan
1. Mengetahui dan menggunakan konsep dasar beorientasi object.
● class
● object
● atribut
● method
● konstruktor
2. Mengetahui dengan jelas tentang konsep lanjutan berorientasi object dan menggunakannya dengan baik
● package
● enkapsulasi
● abstraksi
● pewarisan
● polimorfisme
● interface
3. Mengetahui dengan jelas penggunaan kata kunci this, super, final dan static
4. Membedakan antara method overloading dan method overridding
2. Latar Belakang
Sebelum melangkah pada fitur-fitur menarik yang ada pada Java, mari kita meninjau beberapa hal yang telah Anda pelajari pada pelajaran pemograman pertama Anda. Pelajaran ini menyajikan diskusi tentang perbedaan konsep-konsep berorientasi object dalam Java.
Desain berorientasi object adalah sebuah teknik yang memfokuskan desain pada object dan class berdasarkan pada skenario dunia nyata. Hal ini menegaskan keadaan(state), behaviour dan interaksi dari object. Selain itu juga menyediakan manfaat akan kebebasan pengembangan, meningkatkan kualitas, mempermudah pemeliharaan, mempertinggi kemampuan dalam modifikasi dan meningkatkan penggunaan kembali software.
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3. Percobaan
Percobaan 1 Class SuperHero:
public class SuperHero {
String superPower[];
void setSuperPower(String superPower[]){
this.superPower = superPower;
}
void printSuperPower(){
for(int i=0;i<superPower.length;i++){
System.out.println(superPower[i]);
}
}
}
Percobaan 2 Class Atribut Demo:
public class StudentRecordExample
{
public static void main( String[] args ){
//membuat 3 object StudentRecord
StudentRecord annaRecord = new StudentRecord();
StudentRecord beahRecord = new StudentRecord();
StudentRecord crisRecord = new StudentRecord();
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//Memberi nama siswa
annaRecord.setName("Anna");
beahRecord.setName("Beah");
crisRecord.setName("Cris");
//Menampilkan nama siswa “Anna”
System.out.println( annaRecord.getName() );
//Menampilkan jumlah siswa
System.out.println("Count="+StudentRecord.getStudentCount()
);
}
}
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Percobaan 3 Class method Demo:
public class MethodDemo {
int data;
int getData(){
return data;
}
void setData(int data){
this.data = data;
}
void setMaxData(int data1,int data2){
data = (data1>data2)? data1 : data2;
}}
Percobaan 4 Class Construstor Demo :
public class ConstructorDemo {
private int data;
public ConstructorDemo(){
data = 100;
}
ConstructorDemo(int data){
this.data = data;
}
}
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Percobaan 5 Instantiate sebuah Class:
public class ConstructObj {
int data;
ConstructObj(){
}
void setData(int data){
this.data = data;
}
public static void main(String[] args) {
ConstructObj obj = new ConstructObj();
}
Percobaan 6 Mengakses sebuah object :
public class ConstructObj {
int data;
ConstructObj(){
}
void setData(int data){
this.data = data;
}
public static void main(String[] args) {
ConstructObj obj = new ConstructObj();
obj.setData(10);
System.out.println(obj.data);
}
}
Hasil Percobaan 6 Output mengakses sebuah object :
Percobaan 7 Package :
package registration.reports;
import registration.processing.*;
import java.util.List;
import java.lang.*;
class MyClass {
/*rincian dari MyClass*/
}
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Percobaan 8 Class Enkapsulasi :
public class encapsulation {
private int secret;
public boolean setSecret(int secret){
if(secret <1 || secret >100){
return false;
}
this.secret = secret;
return true;
}
public int getSecret(){
return secret;
}
}
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Percobaan 9 Class Override Demo :
class Superclass {
void display(int n){
System.out.println("super : "+n);
}
}
class Subclass extends Superclass {
void display(int k){
System.out.println("sub : "+k);
}
}
public class OverrideDemo {
public static void main(String[] args) {
Subclass subObj = new Subclass();
Superclass SuperObj = subObj;
subObj.display(3);
((Superclass)subObj).display(4);
}
}
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Hasil Percobaan 9 Output Class Override Demo :
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Percobaan 10 Class Abstract dan method :
abstract class SuperHero {
String superPower[];
void setSuperPower(String superPower[]){
this.superPower = superPower;
}
void printSuperPower(){
for(int i=0;i<superPower.length;i++){
System.out.println(superPower[i]);
}
}
abstract void displayPower();
}
public class UnderwaterSuperHero extends SuperHero {
void displayPower(){
System.out.println("Communicate with sea creatures...");
System.out.println("Fast swimming ability...");
}
}
class FlyingSuperHero extends SuperHero {
void displayPower(){
System.out.println("Fly...");
}
}
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Percobaan 11 Class Interface Demo :
interface MyInterface {
void iMethod();
}
class Myclass1 implements MyInterface{
public void iMethod(){
System.out.println("Interface Method.");
}
void MyMethod(){
System.out.println("Another Method");
}
class Myclass2 implements MyInterface{
public void iMethod(){
System.out.println("Another implementasion");
}
}
public class interfaceDemo {
public static void main(String[] args) {
Myclass1 mc1 = new Myclass1();
Myclass2 mc2 = new Myclass2();
mc1.iMethod();
mc1.MyMethod();
mc2.iMethod();
}
}
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Hasil Percobaan 11 Output Class Interface Demo :
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Percobaan 12 Kata Kunci This :
public class thisDemo1 {
int data;
void method(int data){
this.data = data;
/*
* this. data menunjuk ke atribut dan data menunjuk ke variabel lokal
*/
}}
public class thisDemo2 {
int data;
void method(){
System.out.println(data); //this.data
}
void method2(){
method(); //this.method()
}}
public class thisDemo3 {
int data;
thisDemo3(int data){
this.data = data;
}}
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Percobaan 13 Kata Kunci Super :
class Person{
String firstName;
String lastName;
Person(String fName,String lName){
firstName = fName;
lastName = lName;
}
}
public class student extends Person {
String studNum;
student(String fName,String lName,String sNum){
super(fName,lName);
studNum = sNum;
}
}
Contoh lain : class SuperDemo
class SuperClass{
int a;
void display_a(){
System.out.println("a = "+a);
}}
class ZubClass extends SuperClass{
int a;
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void display_a(){
System.out.println("a = "+a);
}
void set_super_a(int n){
super.a = n;
}
void display_super_a(){
super.display_a();
}}
public class SuperDemo {
public static void main(String[] args) {
SuperClass superObj = new SuperClass();
SubClass SubObj = new SubClass();
superObj.a = 1;
SubObj.a = 2;
SubObj.set_super_a(3);
superObj.display_a();
SubObj.display_a();
SubObj.display_super_a();
System.out.print(SubObj.a);
}}
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Hasil Percobaan 13 Output Kata kunci super:
Percobaan 14 Kata Kunci Static :
class Demo {
static int a =0;
static void staticMethod(int i){
System.out.println(i);
}
static {
System.out.println("This is a block static");
a+=1;
}
}
public class StaticDemo {
public static void main(String[] args) {
System.out.println(Demo.a);
Demo.staticMethod(5);
Demo d = new Demo();
System.out.println(d.a);
d.staticMethod(0);
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Demo e = new Demo();
System.out.println(e.a);
d.a +=3;
System.out.println(Demo.a+", "+d.a+", "+e.a);
}
}
Hasil Percobaan 14 Output Kata kunci static:
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Percobaan 15 Outer Class :
public class OuterClass {
int data = 5;
class InnerClass{
int data2 = 10;
void method(){
System.out.println(data);
System.out.println(data2);
}
}
public static void main(String[] args) {
OuterClass oc = new OuterClass();
InnerClass ic = oc.new InnerClass();
System.out.println(oc.data);
System.out.println(ic.data2);
ic.method();
}
}
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Hasil Percobaan 15 Output Outer Class :
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