Java example source code file (jjs.1)

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The jjs.1 Java example source code

'\" t
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.\"
.\"     Arch: generic
.\"     Software: JDK 8
.\"     Date: 21 November 2013
.\"     SectDesc: Basic Tools
.\"     Title: jjs.1
.\"
.if n .pl 99999
.TH jjs 1 "21 November 2013" "JDK 8" "Basic Tools"
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.nh
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.\" * MAIN CONTENT STARTS HERE *
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.SH NAME    
jjs \- Invokes the Nashorn engine\&.
.SH SYNOPSIS    
.sp     
.nf     
\f3\fBjjs\fR [\fIoptions\fR] [\fIscript\-files\fR] [\-\- \fIarguments\fR]\fP
.fi     
.sp     
.TP     
\fIoptions\fR
One or more options of the \f3jjs\fR command, separated by spaces\&. For more information, see Options\&.
.TP     
\fIscript-files\fR
One or more script files which you want to interpret using Nashorn, separated by spaces\&. If no files are specified, an interactive shell is started\&.
.TP     
\fIarguments\fR
All values after the double hyphen marker (\f3--\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the \f3arguments\fR property (see )\&.
.SH DESCRIPTION    
The \f3jjs\fR command-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH OPTIONS    
The options of the \f3jjs\fR command control the conditions under which scripts are interpreted by Nashorn\&.
.TP
-ccs=\fIsize\fR , --class-cache-size=\fIsize\fR
.br
Sets the class cache size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes (KB), \f3m\fR or \f3M\fR to indicate megabytes (MB), \f3g\fR or \f3G\fR to indicate gigabytes (GB)\&. By default, the class cache size is set to 50 bytes\&. The following example shows how to set it to 1024 bytes (1 KB):
.sp     
.nf     
\f3\-css=100\fP
.fi     
.nf     
\f3\-css=1k\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     

.TP
-co, --compile-only
.br
Compiles the script without running it\&.
.TP
-cp \fIpath\fR , --classpath \fIpath\fR
.br
Specifies the path to the supporting class files To set multiple paths, the option can be repeated, or you can separate each path with a colon (:)\&.
.TP
-D\fIname\fR=\fIvalue\fR
.br
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign \f3myValue\fR to the property named \f3myKey\fR:
.sp     
.nf     
\f3>> \fIjjs \-DmyKey=myValue\fR\fP
.fi     
.nf     
\f3jjs> \fIjava\&.lang\&.System\&.getProperty("myKey")\fR\fP
.fi     
.nf     
\f3myValue\fP
.fi     
.nf     
\f3jjs>\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     


This option can be repeated to set multiple properties\&.
.TP
-d=\fIpath\fR , --dump-debug-dir=\fIpath\fR
.br
Specifies the path to the directory where class files are dumped\&.
.TP
--debug-lines
.br
Generates a line number table in the class file\&. By default, this option is enabled\&. To disable it, specify \f3--debug-lines=false\fR\&.
.TP
--debug-locals
.br
Generates a local variable table in the class file\&.
.TP
-doe, --dump-on-error
.br
Provides a full stack trace when an arror occurs\&. By default, only a brief error message is printed\&.
.TP
--early-lvalue-error
.br
Reports invalid lvalue expressions as early errors (that is, when the code is parsed)\&. By default, this option is enabled\&. To disable it, specify \f3--early-lvalue-error=false\fR\&. When disabled, invalid lvalue expressions will not be reported until the code is executed\&.
.TP
--empty-statements
.br
Preserves empty statements in the Java abstract syntax tree\&.
.TP
-fv, --fullversion
.br
Prints the full Nashorn version string\&.
.TP
--function-statement-error
.br
Prints an error message when a function declaration is used as a statement\&.
.TP
--function-statement-warning
.br
Prints a warning message when a function declaration is used as a statement\&.
.TP
-fx
.br
Launches the script as a JavaFX application\&.
.TP
-h, -help
.br
Prints the list of options and their descriptions\&.
.TP
-J\fIoption\fR
.br
Passes the specified \f3java\fR launcher option to the JVM\&. The following example shows how to invoke Nashorn in interactive mode and set the maximum memory used by the JVM to 4 GB:
.sp     
.nf     
\f3>> \fIjjs \-J\-Xmx4g\fR\fP
.fi     
.nf     
\f3jjs> \fIjava\&.lang\&.Runtime\&.getRuntime()\&.maxMemory()\fR\fP
.fi     
.nf     
\f33817799680\fP
.fi     
.nf     
\f3jjs>\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     


This option can be repeated to pass multiple \f3java\fR command options\&.
.TP
--lazy-compilation
.br
Enables lazy code generation strategies (that is, the entire script is not compiled at once)\&. This option is experimental\&.
.TP
--loader-per-compile
.br
Creates a new class loader per compile\&. By default, this option is enabled\&. To disable it, specify \f3--loader-per-compile=false\fR\&.
.TP
--log=\fIsubsystem\fR:\fIlevel\fR
.br
Performs logging at a given level for the specified subsystems\&. You can specify logging levels for multiple subsystems separating them with commas\&. For example:
.sp     
.nf     
\f3\-\-log=fields:finest,codegen:info\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     

.TP
--package=\fIname\fR
.br
Specifies the package to which generated class files are added\&.
.TP
--parse-only
.br
Parses the code without compiling\&.
.TP
--print-ast
.br
Prints the abstract syntax tree\&.
.TP
--print-code
.br
Prints bytecode\&.
.TP
--print-lower-ast
.br
Prints the lowered abstract syntax tree\&.
.TP
--print-lower-parse
.br
Prints the lowered parse tree\&.
.TP
--print-no-newline
.br
Forces other \f3--print*\fR options to print the output on one line\&.
.TP
--print-parse
.br
Prints the parse tree\&.
.TP
--print-symbols
.br
Prints the symbol table\&.
.TP
-pcs, --profile-callsites
.br
Dumps callsite profile data\&.
.TP
-scripting
.br
Enables shell scripting features\&.
.TP
--stderr=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard error stream to the specified file, stream (for example, to \f3stdout\fR), or text terminal\&.
.TP
--stdout=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard output stream to the specified file, stream (for example, to \f3stderr\fR), or text terminal\&.
.TP
-strict
.br
Enables strict mode, which enforces stronger adherence to the standard (ECMAScript Edition 5\&.1), making it easier to detect common coding errors\&.
.TP
-t=\fIzone\fR , -timezone=\fIzone\fR
.br
Sets the specified time zone for script execution\&. It overrides the time zone set in the OS and used by the \f3Date\fR object\&.
.TP
-tcs=\fIparameter\fR , --trace-callsites=\fIparameter\fR
.br
Enables callsite trace mode\&. Possible parameters are the following:
.RS     
.TP     
miss
Trace callsite misses\&.
.TP     
enterexit
Trace callsite enter/exit\&.
.TP     
objects
Print object properties\&.
.RE     

.TP
--verify-code
.br
Verifies bytecode before running\&.
.TP
-v, -version
.br
Prints the Nashorn version string\&.
.TP
-xhelp
.br
Prints extended help for command-line options\&.
.SH EXAMPLES    
\f3Example 1 Running a Script with Nashorn\fR
.sp     
.nf     
\f3jjs script\&.js\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     
\f3Example 2 Running Nashorn in Interactive Mode\fR
.sp     
.nf     
\f3>> \fIjjs\fR\fP
.fi     
.nf     
\f3jjs> \fIprintln("Hello, World!")\fR\fP
.fi     
.nf     
\f3Hello, World!\fP
.fi     
.nf     
\f3jjs> \fIquit()\fR\fP
.fi     
.nf     
\f3>>\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     
\f3Example 3 Passing Arguments to Nashorn\fR
.sp     
.nf     
\f3>> \fIjjs \-\- a b c\fR\fP
.fi     
.nf     
\f3jjs> \fIarguments\&.join(", ")\fR\fP
.fi     
.nf     
\f3a, b, c\fP
.fi     
.nf     
\f3jjs>\fP
.fi     
.nf     
\f3\fR
.fi     
.sp     
.SH SEE\ ALSO    
\f3jrunscript\fR
.RE
.br
'pl 8.5i
'bp