Learning Rhino 1

Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

The rhino shell provides a simple way to run scripts in batch mode.

The syntax is:

java org.mozilla.javascript.tools.shell.Main [options] script-filename-or-url [script-arguments]

Example 1:

First of all, download the latest rhino and extract the zip file(for example: c:\rhino1_7R2).

Second, add “c:\rhino1_7R2\js.jar” to the CLASSPATH of your environment.

Third, add a JavaScript file “c:\test.js”, the content is:

print("Hello World!");

Fourth, open CMD window and input following command:

java org.mozilla.javascript.tools.shell.Main c:test.js

the output will be:

Hello World!

OK. We have got the basic concept of Rhino.

Example 2:
1. Open the test.js and modify the content:

for (var i=0; i < arguments.length; i++) { print(arguments[i]);

}

2. Open the CMD window:

java org.mozilla.javascript.tools.shell.Main c:test.js Hello World!

3. Output:

HelloWorld!

Example 3:
1. Modify the test.js:

function add() { var result = 0;

for (var i=0; i < arguments.length; i++) {

result += arguments[i];

}

print(result);

}

add(2, 3, 4);

2. Open the CMD window:

java org.mozilla.javascript.tools.shell.Main c:test.js

3. Output:

9