java - Reading keyboard input inside while loop -

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this question has answer here:

im trying simple menu system, giving me "nosuchelementexception".

when press option 1, executes well, when call option 2 asks me "w" , exception thrown.

i've tried adding if (sc.hasnext) saw on post, after call option 2, keeps looping , doesn't let me type value x.

    public main() {     int x = 5;     scanner sc = new scanner(system.in);      while(x != 0) {         system.out.println("########## mt ###########");         system.out.println("# 1 - read mt           #");         system.out.println("# 2 - read w            #");         system.out.println("# 0 - exit              #");         system.out.println("#########################");         system.out.print("option: ");          x = sc.nextint(); //here error.          switch (x) {         case 1:                 setmaquina(new mt());             break;         case 2:                 if (getmaquina() == null) {                     system.out.println("mt null.");                 }                 else {                     scanner scc = new scanner(system.in);                     system.out.print("    ~ w: ");                      string w = scc.nextline();                      getmaquina().readstring(w);                      scc.close();                 }             break;         case 0:             x = 0;             break;         default:             break;         }     }      sc.close(); }

edit

exception in thread "main" java.util.nosuchelementexception     @ java.util.scanner.throwfor(scanner.java:862)     @ java.util.scanner.next(scanner.java:1485)     @ java.util.scanner.nextint(scanner.java:2117)     @ java.util.scanner.nextint(scanner.java:2076)     @ maquina.turing.main.<init>(main.java:26)     @ maquina.turing.main.main(main.java:11)


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