What is the difference between Java i++ and ++i and & and &&?

Package Com.yuan.test;public class Testyuhuo {public static void main (string[] args) {int i=3; System.out.println ("i++:" +i++); Output:3 System.out.println ("++i:" + (++i)),//output:5 if ((i++>5) & (i++<9)) {//SYSTEM.O            Ut.println (i); System.out.println ("Congratulations, you're done with the conditional statement!        ");    } System.out.println ("123:" +i); }} Output Result: I++:3++i:5123:7

Summarize:

i++ is not added until the execution is complete.

++i: Performs a self-added result.

&: The first condition fails and is judged later.

&&: The first condition failed, and none of the latter was executed.

What is the difference between Java i++ and ++i and & and &&?