How I can to change the value of variable in interface by evrey class implement this interface in java ?

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I have interface :

public interface Myglobal 
{
   public int Type =0;
}

Then I have class implement My interface like :

Public class A implements Myglobal 
{
   Public class A ()
   {
      this.type=1; // here error because type final in interface
   }
}

I want for evrey class implement the interface to change the value of variable type ... so how I can do it with java ?

What I have tried:

I read the java not allow ... but what I can to do to make evrey class implement this interface to change the value of variable in interface ?

Posted 17-Sep-16 3:42am

Member 12702671

Updated 17-Sep-16 10:37am

Nelek

v2

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Richard MacCutchan · Answer 1 · 2016-09-17T06:10:00

Solution 1

See Chapter 9 Interfaces[^].

Posted 17-Sep-16 6:10am

Richard MacCutchan

Henrik Jonsson · Answer 2 · 2016-09-17T07:01:00

Solution 2

As you have concluded

Type

is a constant that cannot be changed. Thus you have to create a interface method and then simply implement this in each implementing class like this:

Java

public interface Myglobal 
{
     public int getType();
}
 
public class A implements Myglobal 
{
     public int getType() { return 1; }
}

Posted 17-Sep-16 7:01am

Henrik Jonsson

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Member 12702368 17-Sep-16 13:09pm

Ok ... thank you @Henrik jonsson