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class CustomView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = androidx.appcompat.R.attr.editTextStyle
) : AppCompatEditText(context, attrs, defStyleAttr)

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GsonBuilder()
    .registerTypeAdapter(DateTime::class.java, DateTimeTypeConverter())
    .registerTypeAdapterFactory(CustomTypeAdapterFactory())
    .create()

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GsonBuilder()
    .registerTypeAdapter(DateTime::class.java, DateTimeTypeConverter())
    .registerTypeAdapterFactory(KotlinReflectiveTypeAdapterFactory.create(true))
    .registerTypeAdapterFactory(CustomTypeAdapterFactory())
    .create()

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private final ObjectConstructor<T> constructor;

@Override
public T read(JsonReader in) throws IOException {
    ...
    T instance = constructor.construct();
    ... 
    in.beginObject();
    while (in.hasNext()) {
        String name = in.nextName();

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data class SimpleModel(
    val hello: String,
    val world: Int
) {
    val secondHello: String = hello
    val secondWorld: Int

    init {
        secondWorld = world
    }

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data class SimpleModel(
    val hello: String,
    val world: Int
)

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class TestModel(
    val required: Any,
    val nonnull: Any = Any(),
    val nullable: Any? = null
) {
    constructor(
        required: Any,
        nonnull: Any
    ) : this(required, nonnull, null)

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data class TestModel @JvmOverloads constructor(
    val requiredValue: Any,
    val nonnullValue: Any = Any(),
    val nullableValue: Any? = null
) {
    fun newBuilder(): Builder = Builder(this)
    
    class Builder() {
        lateinit var required: Any
        var nonnull: Any = Any()

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data class TestModel @JvmOverloads constructor(
    val required: Any,
    val nonnull: Any = Any(),
    val nullable: Any? = null
)

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class CustomView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0,
    defStyleRes: Int = 0
) : LinearLayout(context, attrs, defStyleAttr, defStyleRes) {
    init {
        orientation = VERTICAL
        inflate(context, R.layout.custom_view, this)
    }