1. if문public class oop7 { public static void main(String[] args) { oop7_box ob = new oop7_box(); String username = "홍길동"; ob.login(username); System.out.println(ob.muleo(33, 42, 82)); System.out.println(ob.enck("hong@nate.com", "홍길동")); }}class oop7_box{ public void login(String mname) { String mid = "hong"; String mpass = "a1234"; if(mid =="hong" && mname.equals("홍길동")) { System.o..