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class NonLazyDemoAdapter internal constructor(
    fm: FragmentManager
) : FragmentStatePagerAdapter(fm) {

    internal data class FragmentBundle(
        @SerializedName("id") // caller side now can be refactored to use property, not JvmField
        var id: Int,
        @SerializedName("name")
        var name: String
    ) : Serializable

fo2rist

class NonLazyDemoAdapter internal constructor(
    fm: FragmentManager
) : FragmentStatePagerAdapter(fm) {

    internal class FragmentBundle(
        @JvmField
        @SerializedName("id")
        var id: Int,

        @JvmField

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    override fun getItem(position: Int): Fragment {
        return cachedFragments[position]
    }

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    override fun getItem(position: Int): Fragment {
        return cachedFragments[position]!!
    }

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class NonLazyDemoAdapter internal constructor(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {

    internal class FragmentBundle(
        @JvmField
        @SerializedName("id") // if this field was used directly before we need JvmField annotation
        var id: Int,

        @JvmField
        @SerializedName("name") // if this field was used directly before we need JvmField annotation
        var name: String

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class NonLazyDemoAdapter internal constructor(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {

    internal class FragmentBundle(
      
        @field:SerializedName("id") var id: Int,

        @field:SerializedName("name") var name: String
    ) : Serializable

    companion object {

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class NonLazyDemoAdapter internal constructor(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {

    private val pages = arrayOf(SomePage.FIRST, SomePage.SECOND)

    override fun getItem(position: Int): Fragment {
        return cachedFragments[position]!!
    }
}

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public class NonLazyDemoAdapter extends FragmentStatePagerAdapter {
    @NonNull // don't forget to mark array content non-nullable
    private SomePage[] pages = new SomePage[]{FIRST, SECOND};

    @NonNull
    private PageFragment[] cachedFragments = new PageFragment[pages.length];

    NonLazyDemoAdapter(@NonNull FragmentManager fm) {
        ...
    }

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public class NonLazyDemoAdapter extends FragmentStatePagerAdapter {
    @NonNull
    private SomePage[] pages = new SomePage[]{FIRST, SECOND};

    @NonNull
    private PageFragment[] cachedFragments = new PageFragment[pages.length];

    NonLazyDemoAdapter(@NonNull FragmentManager fm) {
        ...
    }

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public class NonLazyDemoAdapter extends FragmentStatePagerAdapter {

    private SomePage[] pages = new SomePage[]{FIRST, SECOND};

    private PageFragment[] cachedFragments = new PageFragment[pages.length];

    NonLazyDemoAdapter(FragmentManager fm) {
        ...
    }