gistfile1.java

class SomeParser {
   parse(line) {
    // Do some parsing work.
   }

   dataReady() {
    // Easy way for others to figure out if the parser has data that's ready to be collected.
   }
 }

 class SomeWorker {
   handle(line) {
     SomeParser.parse(line);
     // For why dataReady() make good design, see Note 1.
     if (SomeParser.dataReady()) {
       data = SomeParser.getData();
       // Do some stuff with data.
     }
   }
   
   finish() {
      // Write this only if you want to print something out once
      // your program is done reading from the stream.
   }

   // other helper functions here...
 }

 int main() {
   while stdin.hasNextLine():
     SomeWorker.handle( stdin.nextLine() );

   // Only if you need to output additional data at the end of the stream.
   SomeWorker.finish();
 }