question: public String readLine ( String fmt , Object ... args ) { String line = null ; synchronized ( writeLock ) { synchronized ( readLock ) { if ( fmt . length ( ) != 0 ) pw . format ( fmt , args ) ; try { char [ ] ca = readline ( false ) ; if ( ca != null ) line = new String ( ca ) ; } catch ( IOException x ) { throw new IOError ( x ) ; } } } return line ; }
target:  Provides a formatted prompt, then reads a single line of text from the console.