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BAEL-5132 Abstract class constructors examples (eugenp#11389)
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‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/defaultconstructor/AbstractClass.java‎

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package com.baeldung.abstractconstructors.defaultconstructor;
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public abstract class AbstractClass {
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// compiler creates a default constructor
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/defaultconstructor/ConcreteClass.java‎

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package com.baeldung.abstractconstructors.defaultconstructor;
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public class ConcreteClass extends AbstractClass {
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public ConcreteClass() {
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super();
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}
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/noargs/AbstractClass.java‎

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package com.baeldung.abstractconstructors.noargs;
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public abstract class AbstractClass {
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public AbstractClass() {
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System.out.println("Initializing AbstractClass");
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}
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/noargs/ConcreteClassA.java‎

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package com.baeldung.abstractconstructors.noargs;
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public class ConcreteClassA extends AbstractClass {
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/noargs/ConcreteClassB.java‎

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package com.baeldung.abstractconstructors.noargs;
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public class ConcreteClassB extends AbstractClass {
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public ConcreteClassB() {
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System.out.println("Initializing ConcreteClassB");
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}
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/noargs/Counter.java‎

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package com.baeldung.abstractconstructors.noargs;
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public abstract class Counter {
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int value;
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private Counter() {
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this.value = 0;
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System.out.println("Counter No-Arguments constructor");
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}
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public Counter(int value) {
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this.value = value;
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System.out.println("Parametrized Counter constructor");
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}
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abstract int increment();
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/noargs/SimpleCounter.java‎

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package com.baeldung.abstractconstructors.noargs;
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public class SimpleCounter extends Counter {
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public SimpleCounter(int value) {
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super(value);
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}
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@Override
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int increment() {
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return ++value;
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}
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/parametrized/Car.java‎

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package com.baeldung.abstractconstructors.parametrized;
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public abstract class Car {
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private int distance;
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private Car(int distance) {
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this.distance = distance;
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}
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public Car() {
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this(0);
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System.out.println("Car default constructor");
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}
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abstract String getInformation();
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protected void display() {
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String info = new StringBuilder(getInformation())
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.append("\nDistance: " + getDistance())
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.toString();
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System.out.println(info);
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}
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public int getDistance() {
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return distance;
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}
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/parametrized/ElectricCar.java‎

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package com.baeldung.abstractconstructors.parametrized;
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public class ElectricCar extends Car {
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int chargingTime;
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public ElectricCar(int chargingTime) {
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this.chargingTime = chargingTime;
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}
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@Override
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String getInformation() {
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return new StringBuilder("Electric Car")
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.append("\nCharging Time: " + chargingTime)
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.toString();
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}
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}

‎core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/abstractconstructors/parametrized/FuelCar.java‎

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package com.baeldung.abstractconstructors.parametrized;
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public class FuelCar extends Car {
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String fuel;
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public FuelCar(String fuel) {
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this.fuel = fuel;
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}
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@Override
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String getInformation() {
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return new StringBuilder("Fuel Car")
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.append("\nFuel type: " + fuel)
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.toString();
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}
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}

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