What Java code is generated as a result of compiling a singleton object created with a Kotlin object?

Kotlin object for singleton is compiled into Java as a class with a private constructor and a static field INSTANCE that contains the single instance of this class. Additionally, a static initialization block is created where INSTANCE is initialized.

A simplified example of the structure in Java:

public final class MySingleton {
    public static final MySingleton INSTANCE;

    private MySingleton() {
        // private constructor
    }

    static {
        INSTANCE = new MySingleton();
    }

    // singleton methods
}

Thus, access to the singleton from Java is through MySingleton.INSTANCE.