Call of kotlin data class
kotlin Code:
package com.tianfu.kotlin /** * age Member annotations cannot have get and set methods. They can only assign values directly and cannot declare private */ data class Person(var name:String,@JvmField var age:Int)
java code
import com.tianfu.kotlin.Person; public class PersonMain { public static void main(String[] args) { Person person=new Person("Andy",27); System.out.println(person.getName()+" is "+person.age);//There are no get and set methods for age here person.setName("Boby"); person.age=37; System.out.println(person.getName()+" is "+person.age); // person.setName(null); you can't leave it empty here. An error will be reported when running } }
result: 
Call of object simple profit mode class in Kotlin
kotlin Code:
package com.tianfu.kotlin object Singleton { fun syhello(){ println("The Ming moon in Qin Dynasty") } }
java code
import com.tianfu.kotlin.Singleton; public class AccessToObject { public static void main(String[] args) { Singleton.INSTANCE.syhello(); } }
Calling file class in Kotlin
kotlin code
package com.tianfu.kotlin /** * kotlinFile The File will be compiled into the corresponding class */ fun printHello(){ println("Only by crossing the sea can we show the true qualities of a hero") } fun main(args: Array<String>) { printHello() }
Calling Java code
import com.tianfu.kotlin.PackageKt; public class CallPackageMethod { public static void main(String[] args) { PackageKt.printHello();//Compile the kotlinfile of package into class, then adjust the method. } }
Call of jvm annotation, flexible transfer of parameters
kotlin annotation code
package com.tianfu.kotlin class OverLoads { @JvmOverloads//If you add this annotation, the method parameters will have default values. Otherwise, all three parameters will be passed in java fun overloaded(a:Int,b:Int=0,c:Int=1){ println("$a,$b,$c") } }
Java call code
import com.tianfu.kotlin.OverLoads; public class AccessToOverLoads { public static void main(String[] args) { OverLoads overLoads=new OverLoads(); overLoads.overloaded(10,11,12);//Methods with three parameters overLoads.overloaded(13);//b. C use the default value overLoads.overloaded(12,13);//c use the default value } }
String string null call
kotlin code
package com.tianfu.kotlin fun String.notEmpty():Boolean{//There are no parameters return this !="" }
Java code to achieve null, direct transfer parameters
import com.tianfu.kotlin.ExtensionMethodKt; public class CallExtensionMethod { public static void main(String[] args) { System.out.println(ExtensionMethodKt.notEmpty("Blue sky and misty rain")); } // Results: true }