StreamTokenizer st = new StreamTokenizer(new FileReader("input.txt"));
boolean eof = false;

do{
   int i = 0;
   int token = st.nextToken();
   switch (token){
       case StreamTokenizer.TT_EOF:
            System.out.println("EOF");
            eof = true;
            break;
       case StreamTokenizer.TT_EOL:
            System.out.println("EOL");
            break;
       case StreamTokenizer.TT_WORD:
            System.out.println("Word: " + st.sval);
            break;
       case StreamTokenizer.TT_NUMBER:
            System.out.println("Number: " + st.nval);
            break;
       default:
            System.out.println((char) token + " encountered.");
            break;

   }
} while (!eof);

top 'AT THE TOP' {
   l 2{ window{Open Up} }
}

Word: top
' encountered.
{ encountered.
Word: l
Number: 2.0
{ encountered.
Word: window
{ encountered.
Word: Open
Word: Up
} encountered.
} encountered.
} encountered.
EOF

st.quoteChar(''');

public int ttype

case ''':
  System.out.println("Quoted value is " + st.sval);
  break;