Did the tassels come out and did the ears form and you failed to get corn kernals form?
If the tassels did not come out, they weren't ready yet. Corn is a long crop 70-85 days. However, as the days get shorter, corn will take longer to mature.
Corn is a heavy feeder of nitrogen; takes up a relatively large space in a small garden; needs to be planted in a block 4x4 or bigger rather than in a row for good pollination. Corn ears are ready when the silk turns brown and you can feel the kernels through the husk or when you open the husk and you can see how well the ear is filled. The juices should be semi clear, if the kernels are dark and not as plump and the juices are thick and milky, the corn is starchy.
If you want sweet corn make sure you plant a sweet corn variety.
Happy gardening in Hawaii. Gardens are where people grow.