java - How to validate whether or not a single input line is only integers? -

the program supposed receive 4 integers in single input user (eg 1 2 3 42). trying write code check whether or not input integers.

however, when input 1 2 b, not enter while loop, , can't figure out why. appreciated.

scanner scan = new scanner(system.in);       system.out.print("please list @ least 1 , 10 integers: "); scan.hasnextint();      while(!scan.hasnextint())         {             system.out.println("one or more of inputs not integer. please input integers: ");             scan.next();         } 

you not progressing reading next int scanner.

try input 1 b using following code:

scan.hasnextint(); scan.nextint();   // or scan.next() read next integer     while(!scan.hasnextint())         {             system.out.println("one or more of inputs not integer. please input integers: ");             scan.next();         } 

it print:

one or more of inputs not integer. please input integers:

only integers:one or more of inputs not integer. please input