java - How to compare Numbers from a file with random numbers? -

java - How to compare Numbers from a file with random numbers? -

hello case. lotto application works, need lastly thing implement , have huuuuge problem this. have 6 numbers saved in "lotto.dat" file. 1, 2, 3, 4, 5, 6. if don't take new numbers, app generates 6 new random numbers , compare them. works.

but if wan't 6 new numbers, save them in arraylist , printstream them "lotto.dat", file contains 6 numbers brackets cus of arraylist thing. have feeling might problem since when new numbers saved, says there no match tho there is.

this numbers method:

scanner scann = new scanner(system.in); file f = new file("lotto.dat"); printstream output = new printstream(f); output.print(num1 + " " + num2 + " " + num3 + " " + num4 + " " + num5 + " " + num6); system.out.println("your lotto numbers: " + num1 + " " + num2 + " " + num3 + " " + num4 + " " + num5 + " " + num6); system.out.println("would maintain these numbers? y/n"); string yn = scann.nextline(); if(!yn.equals("y")){ newnumbers(); }//while yn !y

in newnumbers method fill arraylist 6 newnumbs written in console. printstream arraylist "lotto.dat" overwrited.

now code compare random numbers(numbers arraylist):

for(int n : numbers) { // go through numbers in list string match = docompare(n); // docompare metode if(match.equals("true")){ list<integer> numbersmatch = new arraylist<>(); numbersmatch.add(n); thread.sleep(1000); system.out.println(); system.out.println("match on number: " + n); count++; } }

and here docompare method:

scanner sc = new scanner(new file("lotto.dat")); list<integer> mn = new arraylist<>(); while(sc.hasnextint()){ mn.add(sc.nextint()); } if(mn.contains(n)){ string tf = "true"; homecoming tf; } else{ string tf = "false"; homecoming tf; }

i've spent literally many hours trying solve problem can't. why doesn't compare numbers? thing change, new numbers saved in lotto.dat has "[]" within external file.

you said

but if wan't 6 new numbers, save them in arraylist , printstream them "lotto.dat", file contains 6 numbers brackets cus of arraylist thing.

considering statement above you'll have problem code below since when scanner see bracket while loop exit , won't have int in array

while(sc.hasnextint()){ mn.add(sc.nextint());}

now problem clear may seek having loop writing @ file prevent brackets included in file or may utilize regex eliminate characters not int file before reading.

java methods arraylist printstream