The following code is 100% valid and prints:

Init
Validate: true
Execute: 1
Update
Validate: true
Execute: 2
Update
Validate: false
Exit
0
1
2
3
4
5
6
7
8
9

import static java.lang.System.out;

public class ForLoop {
    public static void main(String args[]) {
        for (int i = init(); isTrue(i); i++, out.println("Update")) {
            out.println("Execute: " + i);
        }
        out.println("Exit");

        int i = 0;
        for( ; ; ) {
            if (i < 10) {
                out.println(i);
            }
            else {
                break;
            }
            i++;
        }
    }

    private static boolean isTrue(int i) {
        boolean val = i < 3;
        out.println("Validate: " + val);
        return val;
    }

    private static int init() {
        out.println("Init");
        return 1;
    }
}