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Re: Java basic question

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Thank you all for prompt responses.
Very much appreciated.




On 08/03/2013 08:46 PM, Lew wrote:
> Eric Sosman wrote:
>> isuy wrote:
>>> Suppose I have:
>>>
>>> class A {
>>>      String index = "string";
>>>
>>>       String getPage(String str) { return str; }
>>> }
>
> You are asking the method to return its argument, 'str', not the member
> variable 'index' or anything else.
>
>>>
>>> When I call:
>>>
>>>        new A().getPage("index") , it returns "index" instead of "string".
>
> Why do you say "instead of"? You clearly ask 'getPage()' to return its
> argument, which in that call evaluates to "index". What else could it do?
>
>>> What Do I need to do to get "string"?
>
> Code the routine to return what you want instead of its method argument.
>
>>       There are lots of possibilities, depending on precisely
>> what you're trying to do.  Here are a few:
>>
>> 	class A {
>> 	    String getPage(String ignored) {
>> 	        return "string";
>> 	    }
>> 	}
>> 	// ...
>> 	String result = new A().getPage("zaphod");
>>
>> 	class A {
>> 	    String index = "string";
>> 	    String getPage() {
>> 	        return index;
>> 	    }
>> 	}
>> 	// ...
>> 	String result = new A().getPage();
>>
>> 	class A {
>> 	    String index;
>> 	    A(String thing) {
>> 	        index = thing;
>> 	    }
>> 	    String getPage() {
>> 	        return index;
>> 	    }
>> 	}
>> 	// ...
>> 	String result = new A("string").getPage();
>>
>> 	class A {
>> 	    String index = "string";
>> 	    String getPage(String str) {
>> 	        if ("index".equals(str)) {
>> 	            return index;
>> 	        }
>> 	        throw new IllegalArgumentException(
>> 	            "bad argument: " + str);
>> 	    }
>> 	}
>> 	// ...
>> 	String result = new A().getPage("index");
>> 	String failure = new A().getPage("zaphod");
>>
>> 	// No "class A" at all, and
>> 	String result = "string";
>>
>>       So: What are you trying to do?
>

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Java basic question isuy <isuy@socal.rr.com> - 2013-08-03 18:17 -0700
  Re: Java basic question Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-08-03 21:51 -0400
    Re: Java basic question Lew <lewbloch@gmail.com> - 2013-08-03 20:46 -0700
      Re: Java basic question isuy <isuy@socal.rr.com> - 2013-08-04 00:54 -0700

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