The Following Method Recognizes Whether a String Parameter Consists of a Specific

question 28

Multiple Choice

The following method recognizes whether a String parameter consists of a specific pattern and returns True if the String has that pattern, false otherwise. Use this recursive method to answer the questions below.
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 (a.length( ) = = 2 && a.charAt(0) != a.charAt(1) ) return false;
else if (a.charAt(0) == a.charAt(a.length( ) - 1) )
return patternRecognizer(a.substring(1, a.length( ) - 1) ) ;
else return false;
}
-If the method is called as patternRecognizer(x) where x is "aa", what will the result be?

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

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