java - Passing a parameter of an object contained in an arraylist to a method -

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The title may be a little confusing or misleading, but I'm trying to compare a string:

string mestring = "ABC";

and then try to compare it with every single string contained in the array list 

  ArrayList & lt; String & gt; Array = new arreelist & lt; String & gt; (); Array.add ("The first letters of the alphabet are ABC"); Array.add ("abc"); Array.add ("alphabet"); Array.add ("nothing");

I have got a class which is the only thing which is important "searching" method. 

  Public Zero Search (ArrayList> Object> Objects)

If you have noticed, then this method is an array of object parameters As receives. The problem now is that ArrayList & lt; String & gt; The array which I have mentioned above is the property of each item, so I can not read it directly through the array list (I can do but I do not know how). Is there a way that the attributes of an object should be obtained in the form of a parameter inside the array or through it in a different square method?

Your problem appears with Java Generic. Generics can be used here by ArrayList In conjunction with Java, let Java know how you want to save that code ArrayList if you want to create ArrayList Want to store types of objects, tell examples of a class MyClass that you have defined somewhere else, if you have defined Can 

  ArrayList & LT; MyClass & gt; MyObjs = New Arrestist & lt; MyClass & gt; ();    
 To instantiate an  ArrayList , you can only hold the object of  MyClass . 
 
 You mention that 
 
 
 The ArrayList array mentioned above is a property of each of these objects 
 
 
 which means I Is that the  object  s contains  the orleist and lieutenant; Object & gt; In the designated  objects  you have examples of a special class in your  Search  method (preceding the example, Code> MyClass ). In that class,  ArrayList & lt; String & gt;  is that the issue you want to intersect as the example data is that you have not told Java that  ArrayList & lt; Object & gt; Examples of  MyClass  are, so when you get something from objects, Java does not know it is  MyClass . (To be specific, the compiler does not know it.) 
 
 If you want to access the instance data of an object, then you need to tell Java that the data that you have Accessing the Java Compiler is very careful about what types of objects are, and which operations are defined on each object. If you try to use the instance data from one instance of  MyClass , but the compiler thinks that the type of example is  object , then the compiler will be very upset with you ( Because you do not know that in the question in the example is actually the data you use - it can be an object of another type!). What you need to do is tell the compiler that you can only store examples in  MyClass  in your  ArrayList  so that the compiler will know that the  ArrayList < / Code> wants to access that instance data.

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