[BAEL-3210] - Java Copy Constructor (#7706)

* [BAEL-3210] - Copy constructors in Java

* [BAEL-3210] - Copy constructors in Java

* Change indentation space based on code style instructions.

core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/copyconstructor/Employee.java

@@ -0,0 +1,30 @@
+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);
+    }
+}

core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/copyconstructor/Manager.java

@@ -0,0 +1,31 @@
+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;
+    }
+
+}