Executes a shell command (a.k.a. Shell Execute) from java, such as to open a PDF file or other registered file type

JavaShellExecute.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * A Java method to execute and wait for a shell command to complete
 */
public class JavaShellExecute
{
    public static void main(String[] args) throws Exception {
        runShellCommand("open somefile.txt", true);
    }

    /**
     * The OPEN command on MacOSX causes the registered file handler to open a file.
     * The START command on Windows causes the registered file handler to open a file.
     *
     * Example param can include a path and file such as:
     * "open yourpath/somefile.txt"
     */
	public static void runShellCommand(String shellCommand, boolean printShellOutput) throws IOException, InterruptedException {
		Runtime runtime = Runtime.getRuntime() ;
		Process shellProcess = runtime.exec(shellCommand) ;

		//Only wait for if you need the external app to complete
		shellProcess.waitFor() ;
        
		//You can read the contents of the application's information it is writing to the console
		BufferedReader shellCommandReader = new BufferedReader( new InputStreamReader(shellProcess.getInputStream() ) ) ;

		String currentLine = null;
		while ( (currentLine = shellCommandReader.readLine() ) != null )
		{
			if (printShellOutput)
                System.out.println(currentLine);
		}
	}
}

This code won't work, you waitFor() before creating the reading stream.
And your if(printShellOutput) would be better if it skipped all the BufferedReader creation & loop

@matthewmccullough Thanks!!
Code ran for me :)