The Math Class

public class Main {
    public static void main(String[] args) {
        int result = Math.round(1.1F); // rounds the float to the nearest int

        int result1 = (int) Math.ceil(1.1F); // returns 2
        int result2 = (int) Math.floor(1.1F); // returns 1

        int result3 = Math.max(1, 2); // returns the max value, i.e. 2
        int result4 = Math.min(1, 2); // returns the min value, i.e. 1

        double result5 = Math.random(); // returns a random value between 0 and 1 (a double)
        double result6 = Math.random() * 100; // returns a random value between 0 and 100

        int result7 = (int) Math.round(Math.random() * 100); // round first, then convert to int
        int result8 = (int) (Math.random() * 100); // same as above but without rounding
    }
}