Problem wtih protected method with global variables

[thumpkidd9]

Ok. I am extending the class HttpServlet and using the method

protected void doGet(...) {}

in that method, I called another method called

static void parse_Log()

that populates a 2-d array called list. I initialize this globally like so.

static String list[][] = new String[list_size][ele_size];

When I run the program, any variable that I initialized globally is null or 0 in the doGet() method. Is there anyway I can get access to these variables from the protected method? Do I have to declare them differently?

Thanks

 

[Diancecht]

If you want some comde to be run at the creation class time, you can include them in the constructor or inside an static declaration.

public class someClass {

static {
// initialization code
}
public someClass() {
 // initialization code
}

}

Cheers,

Dian

 

[thumpkidd9]

Ok, There is no main in my class. Can I still have an contructor for it?

 

[thumpkidd9]

Wouldn't I still have to declare the variables globally, then initialize them in the contructor? If I declare globally it doesn't work, and if I dont declare them, I get an error saying the compiler doesn't recognize the variables.

 

[sedj]

Generally, the doGet and doPost methods have public access in your extended classes.

If you want to initialize globals, then override the init() method - this is just called once when the servlet is constructed.

Bear in mind that globals will NOT be thread safe - you will need to synchronize access if you want thread-safety.

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[thumpkidd9]

what is the init() method? I am sorry but I am confused. It doesn't seem that doGet has public access to the static variables because they print fine inside static void parse_Log but not in protected void doGet(). I've tried making a constructor and initializing them there but I am not sure on teh correct syntax. Inside the protected method I create an object from the populate class

String list[][] = new String[][]
Populate p = new Populate(list);

constructor looks like

public Populate(String[][] list) {
  list1 = new String[list_size][ele_size];
}

should I call parse_Log() from inside the constructor?

 

[thumpkidd9]

I dont think I can use the constructor, I get an
InstantiationException when I try and create an instance of Populate which is an Abstract class I guess.

 

[timw]

The init() method is provided by the GenericServlet class which HttpServlet extends. It is called when the servlet is 'brought into service' and is there for you to override in your class.

This is written plainly in the J2EE API docs, BTW.

Tim
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