Kotlin constructors (#4933)

core-kotlin/src/main/java/com/baeldung/constructor/Car.kt

@@ -0,0 +1,17 @@
+package com.baeldung.constructor
+
+class Car {
+    val id: String
+    val type: String
+
+    constructor(id: String, type: String) {
+        this.id = id
+        this.type = type
+    }
+
+}
+
+fun main(args: Array<String>) {
+    val car = Car("1", "sport")
+    val s= Car("2", "suv")
+}

core-kotlin/src/main/java/com/baeldung/constructor/Employee.kt

@@ -0,0 +1,3 @@
+package com.baeldung.constructor
+
+class Employee(name: String, val salary: Int): Person(name)

core-kotlin/src/main/java/com/baeldung/constructor/Person.java

@@ -0,0 +1,19 @@
+package com.baeldung.constructor;
+
+class PersonJava {
+    final String name;
+    final String surname;
+    final Integer age;
+
+    public PersonJava(String name, String surname) {
+        this.name = name;
+        this.surname = surname;
+        this.age = null;
+    }
+
+    public PersonJava(String name, String surname, Integer age) {
+        this.name = name;
+        this.surname = surname;
+        this.age = age;
+    }
+}

core-kotlin/src/main/kotlin/com/baeldung/constructor/Person.kt

@@ -0,0 +1,26 @@
+package com.baeldung.constructor
+
+open class Person(
+        val name: String,
+        val age: Int? = null
+) {
+    val upperCaseName: String = name.toUpperCase()
+
+    init {
+        println("Hello, I'm $name")
+
+        if (age != null && age < 0) {
+            throw IllegalArgumentException("Age cannot be less than zero!")
+        }
+    }
+
+    init {
+        println("upperCaseName is $upperCaseName")
+    }
+
+}
+
+fun main(args: Array<String>) {
+    val person = Person("John")
+    val personWithAge = Person("John", 22)
+}