Learning Java 2th

　　Suppose you are familiar with C#, so this article will not tell the most basic Java features, all I want to talk about is comparisons between Java and C#. Here we go.

1. Naming conventions

　　In Java, every method's name begins with a lowercase. The same to the package name.

2. Special reservedwords

　　1）final：similar to sealed and const in C#, but there is a litter difference from them. See the examples:

/*
*java code
*you can initialize the final field in a constructor
*you can define a method to final whatever you want
*/
public class Test{
     private final String PI;
     
     public Test(){
           PI = "test";
     }
     
     public final void call(){
     }      
}

/*
*C# code
*you can only initialize the const field when you declare it 
*sealed must be used with override when you define a method
*/
public class Test
{
     private const string PI = “test”;  
     
     public sealed override int GetHashCode()
　　　{
         return 1; 
     }  
}

　　2）import：similar to using in C#

　　3）@Override: it is a sign to show that this method override from the parent class. You can choose to add it or not. And I strongly recommend to add it, because it gets better complier support, in complie time, the complier could help to check out whether this method overrides from the parent class.Compared with C#, I would like to say that C# is more strict, because it requires you to add override to the method if it really override from the parent class. 

　　4) package: similar to namespace in C#,but it's a little difference. The package name represents reality directory tree.

　　5) instanceof: similar to is in C#

　　6) super: similar to base in C#

　　7) protected: similar to protected internal in C#