java-使用扫描仪的NoSuchElement

I have declared two strings and reading the input using Scanner(System.in).

此后,当我关闭扫描仪并再次使用扫描仪读取另一个输入时,它会引发错误：NoSuchElementException.
请指导我

import java.util.Scanner;
import java.io.*;  

public class NumericInput

{
  public static void main(String[] args)
  {
    // Declarations
    Scanner in = new Scanner(System.in);
    String string1;
    String string2;

   // Prompts 
    System.out.println("Enter the value of the First String .");
   // Read in values  
    string1 = in.nextLine();
    // When i am commenting below line(in.close) code is working properly. 
    in.close();
    Scanner sc = new Scanner(System.in);
    System.out.println("Now enter another value.");
    string2 = sc.next();
    sc.close();

    System.out.println("Here is what you entered: ");
    System.out.println(string1 + " and " + string2);
  }

}

解决方法:

当您的扫描仪是close时,它也会关闭System.in输入流,您在再次使用它,但是它已关闭,因此当您再次尝试使用扫描仪时,找不到打开的System.in流.

标签：java-util-scanner,nosuchelementexception,java
来源： https://codeday.me/bug/20191028/1955317.html