A good answer might be:

No. The if statements are organized sequentially.

Sample Run of the Program

Here is a sample run of the program: (Of course, it will benefit you to copy-paste-save-compile-and-run the program with Notepad and the JDK.) 

D:\users\default\cs151\Notes\chap20>java ComboLock

Enter first number:
6
Enter second number:
12
Enter third number:
30
Lock opens

QUESTION 8:

Does the program give the user a second chance after the user enters a wrong combination?