关于Scanner类写在循环外面抛出异常后会无限循环的问题

Scanner sc = new Scanner(system.in);
while(true){
try{
a=sc.nextInt();
system.out.println(a);
}
catch(InputMismatchException e){
system.out.println("输入异常")；
}
}Scanner sc = new Scanner(system.in);
while(true