Rerun program

Question

If the user selects 1 ، she will exit the program
If selects 2 , the program will rerun again
What do i do main method run again?

Answer 1

You can use a while-loop. Get input in the loop, check if the input is 1 or 2, proceed correspondingly.

If you are trying to do this on sololearn Java playground, note at playground isn't interactive.

Answer 2

a while loop, or an if else loop would probably work

Answer 3

if (select == 2) main(args);
else if (select==1) System.exit(0);
else;//Whatever you want

Answer 4

Attempt?

Answer 5

Snehil thank you :)

Answer 6

Snehil The problem with the sample you provided is that every time the user selects 2, it creates another level of recursion but never returns back until the user exits the program, not releasing the resources it might hold. And memoization will not help here.

The proper way is already described in the Lisa's answer: create a loop, read the user input in that loop, and action according to that.

Also main() isn't supposed to be called. Doing that you confuse the future readers of your code and possibly yourself.

Answer 7

3axpa
You started the thread yet seems to totally ignore it...
Anyway, here is a sample do while loop.

You constantly check the sc.nextLine() until the user inputs the exit code (in this case, "x") which breaks the loop and exit the program.

Instead of println, you can execute your code instead.

I used the hasNextLine() instead of true to get rid of the error message you get if you break a loop that is expecting a user input.

Of course in Sololearn you cannot really experience the interactive loop, since all the inputs have to be provided in the submit popup.

But if you compile and run the code in a proper terminal, it should give you a continuous input and printout loop without error messages when you input the exit string ("x") to exit the program.

https://code.sololearn.com/c435ehTUIZ7Y/?ref=app

Answer 8

Snehil Pls avoid giving finished code as answer, as this makes the OP skip the most important part of learning. Prefer giving hints for the OP to find the solution instead.

Answer 9

Snehil This is a bad advice. The solution you proposed imposes a memory leak.

3axpa Note that.

Answer 10

Snehil Yes that's the common cause of memory leaks. But it's not the only one. Another one is improper use of recursive functions as in your example.

Answer 11

Snehil Your question cannot be answered in general.

How do you avoid crossing the street on the red signal? Well, you just avoid. You pay attention. For example, don't read your phone near the crossing. Or, if you do, then stand still and don't move while you read. What are the other possibilities and how to avoid them? There are a lot, and it's hard to count them all, not to mention solving them.

Same here. First and simple don't use potentially dangerous things if they're not needed. If you need to, then understand how they work, all the dangers and consequences. Don't use resursion without a real need. Follow best practices and common sense. Don't call the main() function as it's not supposed to be called inside the program itself.

Answer 12

Emerson Prado that's a basic logic not the code

Answer 13

Евгений memory leaks often occur when dynamic memory allocation is used and not properly released

Answer 14

Евгений ok so there are chances when the load is too high for recursion,
in this case we can either have looping or Stack data structure

but is there any better option other than this?

memoization technique can't be preferred right here

Answer 15

Евгений sorry that's true that there's no scope of memoization.

but as the user asked to rerun main() so I just provided a naive code.

I think if we're working on true projects then for such particular condition I would prefer Stack Data Structure.

if you don't mind can you please give me some more ways to avoid memory leak