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[JAVA-621] core-java-lang-oop-constructors module

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* Creation

* Moved code from https://www.baeldung.com/java-constructors

* Moved code from https://www.baeldung.com/java-copy-constructor

* Moved code from https://www.baeldung.com/java-cannot-reference-x-before-supertype-constructor-error

* Moved article references to the new README.md
This commit is contained in:
dupirefr
2020-04-02 21:04:24 +02:00
parent 825a362858
commit 29a0cc015f
16 changed files with 52 additions and 16 deletions
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68
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/constructors/BankAccount.java
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@@ -1,68 +0,0 @@
package com.baeldung.constructors;
import java.time.LocalDateTime;
class BankAccount {
String name;
LocalDateTime opened;
double balance;
@Override
public String toString() {
return String.format("%s, %s, %f", this.name, this.opened.toString(), this.balance);
}
public String getName() {
return name;
}
public LocalDateTime getOpened() {
return opened;
}
public double getBalance() {
return this.balance;
}
}
class BankAccountEmptyConstructor extends BankAccount {
public BankAccountEmptyConstructor() {
this.name = "";
this.opened = LocalDateTime.now();
this.balance = 0.0d;
}
}
class BankAccountParameterizedConstructor extends BankAccount {
public BankAccountParameterizedConstructor(String name, LocalDateTime opened, double balance) {
this.name = name;
this.opened = opened;
this.balance = balance;
}
}
class BankAccountCopyConstructor extends BankAccount {
public BankAccountCopyConstructor(String name, LocalDateTime opened, double balance) {
this.name = name;
this.opened = opened;
this.balance = balance;
}
public BankAccountCopyConstructor(BankAccount other) {
this.name = other.name;
this.opened = LocalDateTime.now();
this.balance = 0.0f;
}
}
class BankAccountChainedConstructors extends BankAccount {
public BankAccountChainedConstructors(String name, LocalDateTime opened, double balance) {
this.name = name;
this.opened = opened;
this.balance = balance;
}
public BankAccountChainedConstructors(String name) {
this(name, LocalDateTime.now(), 0.0f);
}
}

25
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/constructors/Transaction.java
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@@ -1,25 +0,0 @@
package com.baeldung.constructors;
import java.time.LocalDateTime;
class Transaction {
final BankAccountEmptyConstructor bankAccount;
final LocalDateTime date;
final double amount;
public Transaction(BankAccountEmptyConstructor account, LocalDateTime date, double amount) {
this.bankAccount = account;
this.date = date;
this.amount = amount;
}
/*
* Compilation Error :'(, all final variables must be explicitly initialised.
* public Transaction() {
* }
*/
public void invalidMethod() {
// this.amount = 102.03; // Results in a compiler error. You cannot change the value of a final variable.
}
}

30
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/copyconstructor/Employee.java
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@@ -1,30 +0,0 @@
package com.baeldung.copyconstructor;
import java.util.Date;
public class Employee {
protected int id;
protected String name;
protected Date startDate;
public Employee(int id, String name, Date startDate) {
this.id = id;
this.name = name;
this.startDate = startDate;
}
public Employee(Employee employee) {
this.id = employee.id;
this.name = employee.name;
this.startDate = new Date(employee.startDate.getTime());
}
Date getStartDate() {
return startDate;
}
public Employee copy() {
return new Employee(this);
}
}

31
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/copyconstructor/Manager.java
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@@ -1,31 +0,0 @@
package com.baeldung.copyconstructor;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
public class Manager extends Employee {
private List<Employee> directReports;
public Manager(int id, String name, Date startDate, List<Employee> directReports) {
super(id, name, startDate);
this.directReports = directReports;
}
public Manager(Manager manager) {
super(manager.id, manager.name, manager.startDate);
this.directReports = manager.directReports.stream()
.collect(Collectors.toList());
}
@Override
public Employee copy() {
return new Manager(this);
}
List<Employee> getDirectReport() {
return this.directReports;
}
}

16
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClass.java
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@@ -1,16 +0,0 @@
package com.baeldung.supertypecompilerexception;
public class MyClass {
private int myField1 = 10;
private int myField2;
public MyClass() {
//uncomment this to see the supertype compiler error:
//this(myField1);
}
public MyClass(int i) {
myField2 = i;
}
}

15
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClassSolution1.java
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@@ -1,15 +0,0 @@
package com.baeldung.supertypecompilerexception;
public class MyClassSolution1 {
private int myField1 = 10;
private int myField2;
public MyClassSolution1() {
myField2 = myField1;
}
public MyClassSolution1(int i) {
myField2 = i;
}
}

19
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClassSolution2.java
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@@ -1,19 +0,0 @@
package com.baeldung.supertypecompilerexception;
public class MyClassSolution2 {
private int myField1 = 10;
private int myField2;
public MyClassSolution2() {
setupMyFields(myField1);
}
public MyClassSolution2(int i) {
setupMyFields(i);
}
private void setupMyFields(int i) {
myField2 = i;
}
}

15
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClassSolution3.java
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@@ -1,15 +0,0 @@
package com.baeldung.supertypecompilerexception;
public class MyClassSolution3 {
private static final int SOME_CONSTANT = 10;
private int myField2;
public MyClassSolution3() {
this(SOME_CONSTANT);
}
public MyClassSolution3(int i) {
myField2 = i;
}
}

14
core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyException.java
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@@ -1,14 +0,0 @@
package com.baeldung.supertypecompilerexception;
public class MyException extends RuntimeException {
private int errorCode = 0;
public MyException(String message) {
//uncomment this to see the supertype compiler error:
//super(message + getErrorCode());
}
public int getErrorCode() {
return errorCode;
}
}