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You can think of a tokenizer as though it were a machine that steps through a stream of tokens. The
nextToken method moves the machine from one token to the next.
Suppose, for example, that you call nextToken with tokens, a
StreamTokenizer instance, as the target:
tokens.nextToken()
The first time that Java executes a call to the nextToken method,
given that the first token is a number, the value of that token is assigned to the nval instance variable in the
tokenizer:
*-- First token *-----------* | | tokens | | | nval: 4 | v *-----------* --- 4 7 3 8 8 ...
After Java executes the second call to nextToken, the second token
is assigned to nval:
*-- Second token *-----------*
| | tokens |
| | nval: 7 |
v *-----------*
---
4 7 3 8 8 ...