May I get all comment to understand please? (Its java program, Thank you) packag

Question

May I get all comment to understand please?

(Its java program, Thank you)

package pa11;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;

/**
*
* @author narayanthapa
*/
public class PA11 {

public static void main(String [] args) throws IOException {

String[] commandList = {"ls"};
UserIOHandler userIOHandler = new UserIOHandler();
UserProcessCreator processCreator = new UserProcessCreator(commandList, "/Users/narayanthapa/Desktop");
processCreator.startProcess();
userIOHandler.handleEvent(processCreator);
}
}

class UserProcessCreator {
  
private ProcessBuilder proBuilder;
private Process process;
private String[] commandList;
  
public UserProcessCreator(String[] commandList, String directory) {
this.proBuilder = new ProcessBuilder(commandList);
this.proBuilder.directory(new File(directory));
this.commandList = commandList;
}

public void setDirecotry(String directory) {
this.proBuilder.directory(new File(directory));
}
  
public void startProcess()
throws IOException {
this.process = proBuilder.start();
}
  
public Process getProcess() {
return this.process;
}
  
public String[] getCommand() {
return this.commandList;
}
  
public void waitFor() {
try {
int exitValue = process.waitFor();
System.out.println(" Exit Value is " + exitValue);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

class UserIOHandler {
  
public UserIOHandler() {
super();
}
  
public void handleEvent(UserProcessCreator processCreator)
throws IOException {
  
Process process = processCreator.getProcess();
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
System.out.printf("Output of running %s is: ", Arrays.toString(processCreator.getCommand()));

String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
  
processCreator.waitFor();
}
}

Explanation / Answer

If the command is "ls" it will display files under the passed directory.

If command is "pwd" it will display present working directory.

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