Recursion - Java Concepts - page 841

49 String next =
tokenizer.peekToken();
50 if ( "*" .equals(next) ||
"/" .equals(next))
51 {
52 tokenizer.nextToken();
53 int value2 = getFactorValue();
54 if ( "*" .equals(next)) value =
value * value2;
55 else value = value / value2;
56 }
57 else done = true;
58 }
59 return value;
60 }
61
62 /**
63 Evaluates the next factor found in the expression.
64 @return the value of the factor
65 */
66 public int getFactorValue()
67 {
68 int value;
69 String next = tokenizer.peekToken();
70 if ( "(" .equals(next))
71 {
72 tokenizer.nextToken(); // Discard "("
73 value = getExpressionValue();
74 tokenizer.nextToken(); // Discard ")"
75 }
76 else
77 value =
Integer.parseInt(tokenizer.nextToken());
78 return value;
79 }
80
81 private ExpressionTokenizer tokenizer;
82 }

615
616

ch13/expr/ExpressionTokenizer.java

1 /**