java - catch语句重复执行

Question

我正在尝试实现一个(重新)try-catch block 。

Scanner sc = new Scanner(System.in);

while (true){
    try {
        t = sc.nextInt();
        break;
    } catch (Exception e) {
        System.out.println("Please enter a whole number without any symbol(s)!");
    }
}

但这里的问题是，控件再次进入它到达的 catch block ，并且在此之前从未尝试执行 try block 。

Answer 1

这是我解决这个问题的方法...

/*java.util.*/Scanner sc = new /*java.util.*/Scanner(System.in);

while(true)
{
  if(sc.hasNextInt()){ t=sc.nextInt(); break;}
  System.out.println("Please enter a whole number integer (between -2,147,483,649 and 2,147,483,648) without any symbol(s)!");
  sc.nextLine(); // hasNextInt() only scans the current line in the buffer
}