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POPassing Generic Type into indexOf method JAVA
 

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  1. POPassing Generic Type into indexOf method JAVA
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    <p>I want to use the <code>indexOf</code> method to find the number of words, and letters in a String. </p> <p>indexOf method can accept:</p> <pre><code>indexOf(String s) indexOf(Char c) indexOf(String s, index start) </code></pre> <p>So the method can accept <strong>Strings</strong> or <strong>Characters</strong> and can also accept <strong>starting point</strong></p> <p>I want to be able to pass either a String or a Character into this method so I have tried to use generics. The code below is main and 2 functions. As you can see I want to be able to have indexOf work with String or Character that I pass in. If I cast 's' in indexOf to a String, it works, but then crashes when it tries to run as Char. Thanks so much in advance! </p> <pre><code>public static void main(String[] args) { MyStringMethods2 msm = new MyStringMethods2(); msm.readString(); msm.printCounts("big", 'a'); } public &lt;T&gt; void printCounts(T s, T c) { System.out.println("***************************************"); System.out.println("Analyzing sentence = " + myStr); System.out.println("Number of '" + s + "' is " + countOccurrences(s)); System.out.println("Number of '" + c + "' is " + countOccurrences(c)); } public &lt;T&gt; int countOccurrences(T s) { // use indexOf and return the number of occurrences of the string or // char "s" int index = 0; int count = 0; do { index = myStr.indexOf(s, index); //FAILS Here if (index != -1) { index++; count++; } } while (index != -1); return count; } </code></pre>
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    1. COMethod overloading simply doesn't work that way. The three separate `indexOf` methods are essentially unrelated to each other, so you can't use generics to intelligently call one or the other.
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    2. COAhh gosh so not possible basically huh? Unless it was possible to check what type of class the generic object it and then do if (String) then indexOf((String) s, index) & if (Char) then indexOf((Char) s, index)
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