java - Different scanner data types in one loop. What to be done? -

the background: final loop simple program in user first inputs number of integer (double) command-line arguments, put them in array of length [args.length], , allow user enter integer , check whether in array. want loop end , program terminate when user enters string "exit".

but don't know how this. surely, can't hard solve this. (p.s. made static scanner method @ beginning it's not problem computer's 'you can't call on same mr. stdin twice, idiot!').

while (true) {     double userstdin = stdin.nextdouble();     string exit = stdin.nextline();     if (contains(arguments, userstdin) == true) {       system.out.println("this number in array.");     }     else if (contains(arguments, userstdin) == false) {       system.out.println("this number not in array.");     }     if (exit.equals("exit")) {       system.out.println("terminating.");       return;     } } 

i need user able enter either number, or word "exit". how can in loop?

if need user able enter multiple types of data in single input, grab string , parse determine datatypes got.

let's assume scenario user can enter number or word "exit". other input invalid.

first, capture whatever user gives -- string, number, whatever:

string input = stdin.nextline(); 

then try parse use cases:

if("exit".equalsignorecase(input)) {     // user entered exit     system.exit(0); }  // check see if it's number. there's number of ways this, simplicity's // sake, we'll try parse it. try {     double number = double.parsedouble(input);     // here number; } catch (numberformatexception e) {     // not double, whatever was.     // put error handling here, maybe message bad/unrecognized input } 

note checking data types considered bad practice (eg. trying parse catching exception if fail.) i'm doing here illustration of technique.