Using Java with Other Languages - Java - page 952

When you compile and run it, the appropriate editor window appears:

$ javac -d . ExecDemoSimple.java
$ java otherlang.ExecDemoSimple # causes a KWrite window to appear.
$

This version of exec() assumes that the pathname contains no blanks because these break
proper operation of the StringTokenizer . To overcome this potential problem, use an over-
loaded form of exec() , taking an array of strings as arguments. Example 24-1 runs the Win-
dows or Unix version of Netscape, assuming Netscape was installed in the default directory.
It passes the name of a help file as an argument, offering a kind of primitive help mechanism,
as displayed in Figure 24-1 .

Example 24-1. ExecDemoNS.java
public public class class ExecDemoNS ExecDemoNS extends extends JFrame {

private private static static final final String NETSCAPE = "netscape" ;

/** The name of the help file. */
protected

protected final final static static String HELPFILE = "./help/index.html" ;

/** A stack of process objects; each entry tracks one external running process */
Stack < Process > pStack = new

new Stack <>();

/** main - instantiate and run */
public public static throws Exception {

String program = av . length == 0 ? NETSCAPE : av [ 0 ];
new

static void void main ( String av []) throws

new ExecDemoNS ( program ). setVisible ( true true );

}

/** The path to the binary executable that we will run */
protected

protected static static String program ;

/** Constructor - set up strings and things. */
public public ExecDemoNS ( String prog ) {

super

super ( "ExecDemo: " + prog );
String osname = System . getProperty ( "os.name" );
iif ( osname == null null )

new IllegalArgumentException ( "no os.name" );
iif ( prog . equals ( NETSCAPE ))
program = // Windows or UNIX only for now, sorry Mac fans
( osname . toLowerCase (). indexOf ( "windows" )!=- 1 ) ?
"c:/program files/netscape/communicator/program/netscape.exe" :
"/usr/local/netscape/netscape" ;

throw throw new