ExecutionEnv

```
public interface ExecutionEnv
```
Functionality made available to a pluggable JShell execution engine. It is provided to the execution engine by the core JShell implementation.
This interface is designed to provide the access to core JShell functionality needed to implement ExecutionControl.

Since:

9

See Also:

ExecutionControl

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`closeDown()`	Reports that the execution engine has shutdown.
`List<String>`	`extraRemoteVMOptions()`	Returns the additional VM options to be used when launching the remote JVM.
`PrintStream`	`userErr()`	Returns the user's error stream.
`InputStream`	`userIn()`	Returns the user's input stream.
`PrintStream`	`userOut()`	Returns the user's output stream.

- Method Detail
  - userIn
```
InputStream userIn()
```
    Returns the user's input stream.
    
    Returns:
    
    the user's input stream
  - userOut
```
PrintStream userOut()
```
    Returns the user's output stream.
    
    Returns:
    
    the user's output stream
  - userErr
```
PrintStream userErr()
```
    Returns the user's error stream.
    
    Returns:
    
    the user's error stream
  - extraRemoteVMOptions
```
List<String> extraRemoteVMOptions()
```
    Returns the additional VM options to be used when launching the remote JVM. This is advice to the execution engine.
    Note: an execution engine need not launch a remote JVM.
    
    Returns:
    
    the additional options with which to launch the remote JVM
  - closeDown
```
void closeDown()
```
    Reports that the execution engine has shutdown.