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HunorVadaszPerhatHunorVadaszPerhat
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init abstract class
added abstract class with: - abstract and non-abstract methods - all access modifiers (default, public, private, protected) - static and non-static fields - final and non-final fields - constructor
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‎.idea/modules.xml‎

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‎abstract_class/abstract_class.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="jdk" jdkName="17" jdkType="JavaSDK" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎abstract_class/src/Human.java‎

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abstract class Human {
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/*
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* METHODS:
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* - can be both abstract and non-abstract
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* - non-abstract methods can have all access modifiers (default, public, private, protected)
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* - abstract methods can have all access modifiers (default, protected, public) EXCEPT private
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* */
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// DEFAULT + NON-ABSTRACT
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void defaultDisplayNonAbstract(){
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System.out.println("Hello World from defaultDisplayNonAbstract");
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}
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// PUBLIC + NON-ABSTRACT
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public void publicDisplayNonAbstract(){
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System.out.println("Hello World publicDisplayNonAbstract");
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}
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// PRIVATE + NON-ABSTRACT
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private void privateDisplayNonAbstract(){
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System.out.println("Hello World from privateDisplayNonAbstract");
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}
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// PROTECTED + NON-ABSTRACT
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protected void protectedDisplayNonAbstract(){
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System.out.println("Hello World from protectedDisplayNonAbstract");
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}
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// DEFAULT + ABSTRACT
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abstract void defaultDisplayAbstract();
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// PUBLIC + ABSTRACT
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abstract public void publicDisplayAbstract();
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// PRIVATE + ABSTRACT
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// Illegal combination of modifiers: 'abstract' and 'private'
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//abstract private void privateDisplayAbstract();
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// PROTECTED + ABSTRACT
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abstract protected void protectedDisplayAbstract();
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/*
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* FIELDS:
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* - all access modifiers are allowed (default, public, private, protected)
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* - fields can be static and non-static
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* - fields can be final and non-final
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* */
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int a;
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private int b;
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public int c;
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protected int d;
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final int e = 10;
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private final int f = 20;
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public final int g = 30;
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protected final int h = 40;
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static int i = 10;
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private static int j = 20;
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public static int k = 30;
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protected static int l = 40;
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static final int m = 10;
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private static final int n = 20;
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public static final int o = 30;
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protected static final int p = 40;
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// Constructor ONLY takes fields that are non-static and non-final
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// since final and static fields CANNOT BE CHANGED
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public Human(
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// NON-STATIC AND NON-FINAL
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int a, int b, int c, int d,
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// STATIC
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int i, int j, int k, int l
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// FINAL -> Cannot assign a value to final variable
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// STATIC + FINAL -> Cannot assign a value to final variable
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) {
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// NON-STATIC AND NON-FINAL
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this.a = a;
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this.b = b;
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this.c = c;
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this.d = d;
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// FINAL
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// this.e = e; -> Cannot assign a value to final variable 'e'
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// this.f = f; -> Cannot assign a value to final variable 'f'
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// this.g = g; -> Cannot assign a value to final variable 'g'
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// this.h = h; -> Cannot assign a value to final variable 'h'
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// STATIC
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Human.i = i;
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Human.j = j;
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Human.k = k;
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Human.l = l;
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// STATIC + FINAL
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// this.m = m; -> Cannot assign a value to final variable 'm'
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// this.n = n; -> Cannot assign a value to final variable 'n'
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// this.o = o; -> Cannot assign a value to final variable 'o'
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// this.p = p; -> Cannot assign a value to final variable 'p'
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}
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}

‎abstract_class/src/Main.java‎

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public class Main {
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public static void main(String[] args) {
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// Zombie zombie = new Zombie(); -> Expected 8 arguments but found 0
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Zombie zombie = new Zombie(
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10, 20, 30, 40,
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50, 60, 70, 80);
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// NON-FINAL AND NON-STATIC
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System.out.println("NON-FINAL AND NON-STATIC");
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System.out.println("zombie.a: " + zombie.a);
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// System.out.println(zombie.b); -> 'b' has private access in 'Human
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System.out.println("zombie.c: " + zombie.c);
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System.out.println("zombie.d: " + zombie.d);
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System.out.println();
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// FINAL
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System.out.println("FINAL");
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System.out.println("zombie.e: " + zombie.e);
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// System.out.println(zombie.f); -> 'f' has private access in 'Human'
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System.out.println("zombie.g: " + zombie.g);
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System.out.println("zombie.h: " + zombie.h);
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System.out.println();
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// STATIC
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System.out.println("STATIC");
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System.out.println("Zombie.i: " + Zombie.i);
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// System.out.println(Zombie.j); -> 'j' has private access in 'Human'
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System.out.println("Zombie.k: " + Zombie.k);
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System.out.println("Zombie.l: " + Zombie.l);
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System.out.println();
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// STATIC + FINAL
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System.out.println("STATIC + FINAL");
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System.out.println("Zombie.m: " + Zombie.m);
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// System.out.println(Zombie.n); -> 'n' has private access in 'Human'
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System.out.println("Zombie.m: " + Zombie.o);
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System.out.println("Zombie.m: " + Zombie.p);
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System.out.println();
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// ABSTRACT METHODS
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System.out.println("ABSTRACT METHODS");
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zombie.defaultDisplayAbstract();
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zombie.publicDisplayAbstract();
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// zombie.privateDisplayAbstract(); -> 'privateDisplayAbstract()' has private access in 'Human'
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zombie.protectedDisplayAbstract();
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System.out.println();
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// NON-ABSTRACT METHODS
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System.out.println("NON-ABSTRACT METHODS");
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zombie.defaultDisplayNonAbstract();
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zombie.publicDisplayNonAbstract();
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// zombie.privateDisplayNonAbstract(); -> 'privateDisplayNonAbstract()' has private access in 'Human'
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zombie.protectedDisplayNonAbstract();
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}
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}

‎abstract_class/src/Zombie.java‎

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public class Zombie extends Human{
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@Override
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void defaultDisplayAbstract() {
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System.out.println("Hello World defaultDisplayAbstract from Zombie class");
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}
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@Override
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public void publicDisplayAbstract() {
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System.out.println("Hello World publicDisplayAbstract from Zombie class");
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}
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@Override
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protected void protectedDisplayAbstract() {
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System.out.println("Hello World protectedDisplayAbstract from Zombie class");
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}
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public Zombie(int a, int b, int c, int d, int i, int j, int k, int l) {
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super(a, b, c, d, i, j, k, l);
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}
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}

‎access_modifiers/src/Main.java‎

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import package_1.Demo1;
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/*
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* Sources:
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* https://dxc.udemy.com/course/java-se-programming/learn/lecture/18027383#overview
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* https://dxc.udemy.com/course/java-se-programming/learn/lecture/18585551#overview
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* */
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public class Main {
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public static void main(String[] args) {
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Demo1 demo1 = new Demo1();

‎out/production/abstract_class/Human.class‎

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‎out/production/abstract_class/Main.class‎

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‎out/production/abstract_class/Zombie.class‎

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