Not sure about the type erasure?

Hi, my doubt is erase type. Here's the class with generics.
public class Person<T>{
    
       public T add(T a){
               System.out.println("happy");
       }
}
When compiled type erasure happens. I mean when it is converted to type of class erase file arrives. so the code might be as follows
public class Person{

         public Object add(Object a){
                    System.out.println("happy");
         }
}
When the compilation is finished, I started to write the main method and in my main method when I declare
Person a=new Person()
the compiler generates a warning saying that the Person class is a type of crude. arguments must be provided to the type parameters. So when there is no generic drugs in the class file, how the compiler identifies that the person is a generic class and arguments must be provided to the type parameters.

Myriam wrote:
Now, there is a basic doubt. so far, I thought that the byte-code and the class file is the same. I mean the class file contains the byte-code which is the reason class file runs on all platforms. I also google to know the difference between byte-code and class file but I couldn't find anything. Class file is different from byte-code. If yes what is the class file and what is byte code?

The class file contains the byte-code indeed - other elements of prudent information to the virtual machine to actually load and interpret the class file.

http://docs.Oracle.com/javase/specs/JVMs/SE5.0/HTML/ClassFile.doc.html

You should do a basic study in binary data formats to understand the functioning of applications with those. Generally, you need additional information, which is usually stored in the top of the file (the "header"), to know how to load and interpret the binary data in the file. These header information could contain generic details for example.

Take a picture as another simple example file: its impossible to properly load the image data if you don't know at least how wide and height of the image is, how many bytes a single pixel takes upward, etc., then you can just dump the binary image of the file data, you must also store the additional header information.

Tags: Java

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