JDK 9 Java Shell用户指南：Release 9更新 - CSDN文库

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Introduction to JShell

The Java Shell tool (JShell) is an interactive tool for learning the Java programming

language and prototyping Java code. JShell is a Read-Evaluate-Print Loop (REPL),

which evaluates declarations, statements, and expressions as they are entered and

immediately shows the results. The tool is run from the command line.

Topics

• Why Use JShell?

• Starting and Stopping JShell

For reference information for this tool, see

jshell

in Java Platform, Standard Edition

Tools Reference.

Why Use JShell?

Using JShell, you can enter program elements one at a time, immediately see the

result, and make adjustments as needed.

Java program development typically involves the following process:

• Write a complete program.

• Compile it and fix any errors.

• Run the program.

• Figure out what is wrong with it.

• Edit it.

• Repeat the process.

JShell helps you try out code and easily explore options as you develop your program.

You can test individual statements, try out different variations of a method, and

experiment with unfamiliar APIs within the JShell session. JShell doesn’t replace an

IDE. As you develop your program, paste code into JShell to try it out, and then paste

working code from JShell into your program editor or IDE.

Starting and Stopping JShell

JShell is included in JDK 9. To start JShell, enter the

jshell

command on the

command line.

JDK 9 must be installed on your system. If your path doesn’t include java-home/

jdk-9/bin, start the tool from within that directory.

The following example shows the command and the response from JShell. Text that

you enter is shown in bold:

% jshell

| Welcome to JShell -- Version 9

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