Java Program To Calculate Mean Median Mode

Good day to all.
I am already done with the coding and have visited many source to come up with this. But I got 2 problems that I haven't found any solution yet.
1. The input must only terminate once the user enters a negative number or the user has entered 30 integers already.
2. The integers must also be less than 1000; otherwise, the program will just ignore the input.
I've been tweaking this code for days now and still didn't find any solution for the problems. I hope someone can help me. And thank you for the time also and the chance to post here.
My degree of programming in java is below average as of now just started last 2 weeks ago due to requirements in my studies. Aslo forgive my coding if it is not that readable.
This should be the result of this code.
Enter number: 6
Enter number: 7
Enter number: 78
Enter number: 1004
Enter number: 78
Enter number: 54
Enter number: 3
Enter number: 0
Enter number: 66
Enter number: 689
Enter number: -5
Mean: 109
Median: 54
Mode: 78