如何在jshell脚本中接受用户输入？还是我做错了什么？
注意：我不是在寻找如何将参数传递给jshell script。
例如脚本hello.java：
Scanner in = new Scanner(System.in);
System.out.print("Enter number n1: ");
int n1 = in.nextInt();
System.out.print("Enter number n2: ");
int n2 = in.nextInt();
System.out.println("n1 + n2 = "+ (n1 +n2));
/exit
如果我在jshell中逐行键入，它将起作用，但随后我jshell hello.java却无法运行。抛出java.util.NoSuchElementException。
我得到的输出：
@myMint ~/Java $ jshell hello.java
Enter number n1: | java.util.NoSuchElementException thrown:
| at Scanner.throwFor (Scanner.java:858)
| at Scanner.next (Scanner.java:1497)
| at Scanner.nextInt (Scanner.java:2161)
| at Scanner.nextInt (Scanner.java:2115)
| at (#3:1)
Enter number n2: | java.util.NoSuchElementException thrown:
| at Scanner.throwFor (Scanner.java:858)
| at Scanner.next (Scanner.java:1497)
| at Scanner.nextInt (Scanner.java:2161)
| at Scanner.nextInt (Scanner.java:2115)
| at (#5:1)
n1 + n2 = 0
我的系统：Linux Mint 18.2（x64），JShell版本9.0.1
您可以解决此问题，但不能直接使用基于JShell的代码解决。
有这个项目jshell_script_executor：https : //github.com/kotari4u/jshell_script_executor
您可以下载它，并在其中进行少量修改 JShellScriptExecutor.java
从
try(JShell jshell = JShell.create()){
至
// This call will map System.in in your main code
// to System.in inside JShell evaluated code
try(JShell jshell =
JShell.builder()
.in(System.in)
.out(System.out)
.err(System.err)
.build()){
和（也）对您的代码进行少量修改（我知道这并非您所要的，我们在这里不使用Scanner）：
/* Put this code into file.jshell */
import java.io.*;
InputStreamReader read = new InputStreamReader(System.in);
BufferedReader in = new BufferedReader(read);
int n1;
System.out.print("Enter the number: ");
n1 = Integer.parseInt(in.readLine());
int n2;
System.out.print("Enter the number: ");
n2 = Integer.parseInt(in.readLine());
System.out.println("n1 + n2 = " + (n1 + n2));
您可以运行它：
> javac src/main/java/com/sai/jshell/extension/JShellScriptExecutor.java
> java -cp src/main/java com.sai.jshell.extension.JShellScriptExecutor ./file.jshell
Enter the number: 1
Enter the number: 2
n1 + n2 = 3
好吧...实际上，它也可以与您的代码一起使用-稍作修改：
/* Put this code into file_scanner.java */
import java.util.Scanner;
Scanner in = new Scanner(System.in);
System.out.print("Enter number n1: ");
int n1 = in.nextInt();
System.out.print("Enter number n2: ");
int n2 = in.nextInt();
System.out.println("n1 + n2 = "+ (n1 +n2));
试一试
> java -cp src/main/java com.sai.jshell.extension.JShellScriptExecutor ./file_scanner.java
Enter number n1: 1
Enter number n2: 2
n1 + n2 = 3
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