java - Error catching with try-catch and while loop -

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• how handle infinite loop caused invalid input using scanner 5 answers

i'm trying make sure users input integer when use below code infinite loop of print statement. advice of how improve?

boolean valid = false; system.out.println("what block gathering? (use minecraft block ids)"); while(valid == false){     try{         block = input.nextint();         valid = true;     }     catch(inputmismatchexception exception){         system.out.println("what block gathering? (use minecraft block ids)");         valid = false;     } } 

nextint() doesn't consume invalid input try read same invalid value on , on again. solve problem need consume explicitly calling next() or nextline() accept value.

btw make code cleaner , avoid expensive operations creating exceptions should use methods hasnextint() .

here how can organize code

system.out.println("what block gathering? (use minecraft block ids)"); while(!input.hasnextint()){     input.nextline();// consume invalid values until end of line,                       // use next() if want consume them 1 one.     system.out.println("that not integer. please try again"); } //here sure next element int, lets read block = input.nextint();