Using Java with Other Languages - Java - page 958

try try {

p . waitFor ();
} catch catch ( InterruptedException ex ) {

// OK, just quit.
return return ;

}
System . out . println ( "Program terminated!" );
done = true true ;

}

};
waiter . start ();

// getInputStream gives an Input stream connected to
// the process p's standard output (and vice versa). We use
// that to construct a BufferedReader so we can readLine() it.
is = new new BufferedReader ( new new InputStreamReader ( p . getInputStream ()));

while while (! done && (( line = is . readLine ()) != null null ))

System . out . println ( line );

Debug . println ( "exec" , "In Main after EOF" );

return return ;

}

}

This is such a common occurrence that I've packaged it up into a class called ExecAndPrint ,
which is part of my com.darwinsys.lang package. ExecAndPrint has several overloaded
forms of its run() method (see the documentation for details), but they all take at least a
command and optionally an output file to which the command's output is written.
Example 24-3 shows the code for some of these methods.

Example 24-3. ExecAndPrint.java (partial listing)
/** Need a Runtime object for any of these methods */
protected protected final final static static Runtime r = Runtime . getRuntime ();

/** Run the command given as a String, printing its output to System.out */
public public static static int int run ( String cmd ) throws throws IOException {

return return run ( cmd , new new OutputStreamWriter ( System . out ));

}

/** Run the command given as a String, print its output to "out" */
public

public static static int int run ( String cmd , Writer out ) throws throws IOException {