anonymous class via object expression

Anonymous.kt

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

val t1 = Thread(object : Runnable {    
    override fun run() {
         //do something 
    }
})
t1.start()

//Decompiled Java
Thread t1 = new Thread((Runnable)(new Runnable() {
     public void run() {
     
     }
}));
t1.start();