kotlin code decompile to java is error

[LloydFinch]

the follow kotlin code

abstract class A {
    abstract val hello: String

    init {
        println(hello)
    }
}

class B : A() {
    override val hello: String = "hello"
}

fun main() {
    B()
}

the result is "null".

then, decomplie to java code is :

public final class TestKt {
   public static final void main() {
      new B();
   }

 public static void main(String[] var0) {
      main();
   }
}

public abstract class A {
   @NotNull
   public abstract String getHello();

   public A() {
      String var1 = this.getHello();
      boolean var2 = false;
      System.out.println(var1);
   }
}

public final class B extends A {
   @NotNull
   private final String hello = "hello";

   @NotNull
   public String getHello() {
      return this.hello;
   }
}

paste the java code to new file and run it, but the result is "hello"!

who can tell me why?