関連ワード:  java lang integer intvalue ()    java lang integer intvalue () because is null    java lang integer intvalue () because the return value of    int java lang integer intvalue ()' on a null object reference    int java lang integer intvalue ()    cannot invoke java lang integer intvalue ()    cannot invoke java lang integer intvalue () because the return value of is null    cannot invoke java lang integer intvalue () because the return value of    cannot invoke java lang integer intvalue () because current is null    cannot invoke java lang integer intvalue () because is null