So what is the difference between the following codes in a standard for loop?

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So what is the difference between the following codes in a standard for loop: list.get(i) //I know this holds the current element in the list. list.get(i+1); list.get(i -1) list.get(i) + 1) //I think this one grabs the next element following the current element???? list.get(i) -1) I am a little confused as to how this works...or how to implement it. Thanks.

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Nouser

Level 36 , Germany

8 February 2021, 10:03

useful

list.get(i); //as you already said, the element in a list at index i
list.get(i + 1); //so to say the next element in the list index i + 1
list.get(i -1); //easy now ;), the previous index
list.get(i) + 1) // that's no valid code as an opening paranthesis is missing so there are probably two possibilities here
(list.get(i) + 1); // or list.get(i) + 1; here you get the value saved in list.get(i) and increase this value by 1. The object you get must be incrementable (a number or a string)
list.get((i) + 1); //same as in line 2 list.get(i + 1);

MCantu

Level 8 , Texas, United States

8 February 2021, 19:19

Thank you so much, it makes more sense now that you explained it. So just to make sure I got it... (list.get(i) + 1); this adds 1 to the value of i. (example if i= 4 ) return will be 5. list.get((i) + 1); this code gets the next element from current one. (example: 4 5 6 8 9) if current element is at 6, the previous code will return 8. right?

Nouser

Level 36 , Germany

9 February 2021, 08:58

(list.get(i) + 1); this adds 1 to the value of i. (example if i= 4 ) return will be 5. I'd say it get's the value at index i in the list and adds 1 to that value. Why not have a live example. That makes everything much clearer ;)

int i = 3; // give i a value
//ignore the list creation, it's just to fill it with values. list index 0 is 100, 1 is 150 and so on
List<Integer> list = Arrays.asList(100, 150, 200, 250, 300, 350);
System.out.println(list.get(i)); // 250
System.out.println(list.get(i + 1)); // = list.get(4) => 300
System.out.println(list.get(i) + 1); // = list.get(3) + 1 = 250 + 1 = 251

MCantu

Level 8 , Texas, United States

9 February 2021, 16:39

Sweet! Live examples are awesome and always welcome. thank you for your time. :)