public class CekNullDahulu {
    public static void main(String[] args) {
        String nama = "Budi";
        String kosong = null;

        System.out.println("nama terisi? " + (nama != null && nama.length() > 0));
        System.out.println("kosong aman? " + (kosong != null && kosong.length() > 0));
    }
}