What's the point of threads if the program can only handle one request at a time?

Client/src/main/java/SimpleShell.java

         BufferedReader console = new BufferedReader
                 (new InputStreamReader(System.in));
 
-        ObjectMapper mapper = new ObjectMapper();
         ProcessBuilder pb = new ProcessBuilder();
         List<String> history = new ArrayList<String>();
         int index = 0;
                 }
 
                 // wait, wait, what curiousness is this?
-                Process process = pb.start();
-
-                //obtain the input stream
-                InputStream is = process.getInputStream();
-                InputStreamReader isr = new InputStreamReader(is);
-                BufferedReader br = new BufferedReader(isr);
-
-                //read output of the process
-                String line;
-                while ((line = br.readLine()) != null)
-                    System.out.println(line);
-                br.close();
-
-
+//                Process process = pb.start();
+//
+//                //obtain the input stream
+//                InputStream is = process.getInputStream();
+//                InputStreamReader isr = new InputStreamReader(is);
+//                BufferedReader br = new BufferedReader(isr);
+//
+//                //read output of the process
+//                String line;
+//                while ((line = br.readLine()) != null)
+//                    System.out.println(line);
+//                br.close();
+                ThreadCall threadCall = new ThreadCall();
+                threadCall.run(pb);
             }
 
             //catch ioexception, output appropriate message, resume waiting for input
 
         }
 
-
     }
 
 }

Client/src/main/java/ThreadCall.java

+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+public class ThreadCall extends Thread{
+
+    public void run(ProcessBuilder pb) throws IOException {
+        Process process = pb.start();
+        InputStream is = process.getInputStream();
+        InputStreamReader isr = new InputStreamReader(is);
+        BufferedReader br = new BufferedReader(isr);
+
+        //read output of the process
+        String line;
+        while ((line = br.readLine()) != null)
+            System.out.println(line);
+        br.close();
+    }
+
+}

Client/src/main/java/YouAreEll.java

 import com.fasterxml.jackson.databind.ObjectMapper;
 import okhttp3.*;
 
-import java.io.IOException;
-
 public class YouAreEll {
 
     private static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");