Java - 读取String和int：java.util.NoSuchElementException

Question

我尝试读取一个int，然后以这种方式读取一个字符串：

String wantA = "";
Scanner in = new Scanner(System.in);
System.out.println("Enter A");
wantA = in.nextLine();
in.close();   
// some code
int want = 0;
Scanner in = new Scanner(System.in);
System.out.println("Save? Press 1 for yes, or 0 for no");
want = in.nextInt();
in.close(); 

打印后

  

Save? Press 1 for yes, or 0 for no

然后我得到

  

java.util.NoSuchElementException

我该如何解决？

Answer 1

删除in.close(); - 它会终止输入流（永远不会重新打开）。

而是继续使用相同的Scanner 将您的代码更改为：

Scanner in = new Scanner(System.in);
System.out.println("Enter A");
String wantA = in.nextLine();
System.out.println("Save? Press 1 for yes, or 0 for no");
int want = in.nextInt();