Example Code Ch 12-4

question 24

Multiple Choice

Example Code Ch 12-4
The following recursive method recognizes whether a String parameter consists of a specific pattern and returns true if the String has that pattern, false otherwise.
public boolean patternRecognizer(String a)
{
if (a == null) return false;
else if (a.length() == 1 || (a.length() == 2
&& a.charAt(0) == a.charAt(1) ) )
return true;
else if )
return false;
else if )
return patternRecognizer) ;
else return false;
}
-Refer to Example Code Ch 12-4: If the method is called as patternRecognizer(x) where x = "aa", what will the result be?

• A) true
• B) false
• C) NullPointerException
• D) a run-time error
• E) infinite recursion

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