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ExecDemoWait.javaAPI DocExample1314Sat Mar 13 14:24:02 GMT 2004None

ExecDemoWait

public class ExecDemoWait extends Object
ExecDemo shows how to execute an external program read its output, and print its exit status.

Fields Summary
Constructors Summary
Methods Summary
public static voidmain(java.lang.String[] argv)


		// A Runtime object has methods for dealing with the OS
		Runtime r = Runtime.getRuntime();
		Process p; 		// Process tracks one external native process
		BufferedReader is;	// reader for output of process
		String line;
		
		// Our argv[0] contains the program to run; remaining elements
		// of argv contain args for the target program. This is just
		// what is needed for the String[] form of exec.
		p = r.exec(argv);

		System.out.println("In Main after exec");

		// getInputStream gives an Input stream connected to
		// the process p's standard output. Just use it to make
		// a BufferedReader to readLine() what the program writes out.
		is = new BufferedReader(new InputStreamReader(p.getInputStream()));

		while ((line = is.readLine()) != null)
			System.out.println(line);
		
		System.out.println("In Main after EOF");
		System.out.flush();
		try {
			p.waitFor();	// wait for process to complete
		} catch (InterruptedException e) {
			System.err.println(e);	// "Can'tHappen"
			return;
		}
		System.err.println("Process done, exit status was " + p.exitValue());
		return;