Java interoperability

kotlin-playground/src/main/java/com/kotlinplayground/CourseJava.java

@@ -0,0 +1,51 @@
+package com.kotlinplayground;
+
+public class CourseJava {
+
+    private Integer id;
+    private String name;
+    private String author;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public CourseJava(Integer id, String name, String author) {
+        this.id = id;
+        this.name = name;
+        this.author = author;
+    }
+
+    @Override
+    public String toString() {
+        return "CourseJava{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", author='" + author + '\'' +
+                '}';
+    }
+
+    public void printCourse(){
+        System.out.println(this);
+    }
+}

kotlin-playground/src/main/java/com/kotlinplayground/InvokeKoltinFromJava.java

@@ -0,0 +1,31 @@
+package com.kotlinplayground;
+
+import com.kotlinplayground.classes.Authenticate;
+import com.kotlinplayground.classes.Course;
+import com.kotlinplayground.classes.CourseCategory;
+import com.kotlinplayground.classes.CourseKt;
+
+public class InvokeKoltinFromJava {
+
+    public static void main(String[] args) {
+
+        var course = new
+                Course(1,
+                "Reactive Programming in Modern Java using Project Reactor",
+                "Dilip"
+        , CourseCategory.DEVELOPEMENT
+                );
+
+        CourseKt.printName1("dilip");
+        Course.Companion.printName2("abc");
+        var courseName = Course.courseName;
+        Course.printName2("abc");
+        //CourseUtils.printName1("dilip");
+
+        course.noOfCourses= 10;
+
+        //Authenticate.INSTANCE.authenticate("abc", "password");
+        Authenticate.authenticate("abc", "password");
+    }
+}
+

kotlin-playground/src/main/kotlin/com/kotlinplayground/cast/ExploreCast.kt

@@ -6,12 +6,12 @@ fun checkType(type: Any) {
 
     when (type) {
         is Course -> {
-            println("The type is Course")
-            //val course = type as Course // This is redundant
+            println("The type is CourseJava")
+            //val course = type as CourseJava // This is redundant
             println(type.copy())
         }
         is String -> {
-            println("The type is Course ")
+            println("The type is CourseJava ")
             println(type.lowercase())
         }
     }

kotlin-playground/src/main/kotlin/com/kotlinplayground/classes/Authenticate.kt

@@ -1,6 +1,7 @@
 package com.kotlinplayground.classes
 
 object Authenticate {
+    @JvmStatic
     fun authenticate(userName : String, password: String){
         println("User Authenticated for userName : $userName")
     }

kotlin-playground/src/main/kotlin/com/kotlinplayground/classes/Course.kt

@@ -1,11 +1,47 @@
+//@file:JvmName("CourseUtils")
+
 package com.kotlinplayground.classes
 
-data class Course(
+import com.kotlinplayground.CourseJava
+
+data class Course (
+    val id: Int,
+    val name: String,
+    val author: String,
+    var courseCategory: CourseCategory = CourseCategory.DEVELOPEMENT
+){
+
+    @JvmField
+    var noOfCourses = 10
+
+    companion object {
+
+        const val courseName = "Kotlin SpringBoot"
+
+        @JvmStatic
+        fun printName2(name : String) {
+            println("Name is $name")
+        }
+    }
+
+}
+
+
+@JvmName("printName1")
+@JvmOverloads
+fun printName(name : String = "default"){
+    println("name : $name")
+}
+
+
+/*
+data class Course @JvmOverloads constructor(
     val id: Int,
     val name: String,
     val author: String,
     var courseCategory: CourseCategory = CourseCategory.DEVELOPEMENT
 )
+*/
 
 enum class CourseCategory{
     DEVELOPEMENT,
@@ -28,4 +64,11 @@ fun main() {
     val  marketingCourse = Course(1, "FaceBook Marketing", "Dilip", CourseCategory.MARKETING)
     println("marketingCourse : $marketingCourse")
 
+    val courseJava = CourseJava(1, "Reactive Programming in Modern Java using Project Reactor", "Dilip")
+    courseJava.id = 1
+    courseJava.name = "ABC"
+    courseJava.author = "Dilip"
+
+    courseJava.printCourse()
+
 }