how can I declare java interface field that implement class should refine that field

How can I declare java interface field that implement class should refine that field ?

for example

public interface IWorkflow{
    public static final String EXAMPLE;// interface field 
    public void reject();
}

// and implement class
public class AbstWorkflow implements IWorkflow
{
    public static final String EXAMPLE = "ABCD"; /*MUST HAVE*/
    public void reject(){}
...
}

Thank you.