CODEWITHSUNDEEP
java
Bob
Bob

Reputation: 141

Override method - Class variable

let me say first that I did try to Google this, but I'm not really sure what I'm looking for. I understand I could use a setter method, but is there a way to access the fields directly?

List<String> token = new ArrayList<String>();
List<String> lemma = new ArrayList<String>();
List<String> pos   = new ArrayList<String>();

tt.setHandler(new TokenHandler<String>() {
   @Override
   public void token(final String token, final String pos, final String lemma) {
      this.token.add(token); // cannot be resolved or is not a field
      this.lemma.add(lemma); // cannot be resolved or is not a field
      this.pos.add(pos);     // cannot be resolved or is not a field
   }
});

Can you help me?!

Thanks!

Bob

Upvotes: 1

Views: 164

Answers (2)

Simon
Simon

Reputation: 9365

Using the keyword this in front of the variable, indicates that you want to access to instance fields. In this case the fields you would like to access, would belong to the anonymous class instance new TokenHandler<String>() { //... }. Since they are not declared inside the anonymous class, the compiler is not able to resolve them. That's why you are probably getting an error. Add the keyword final and access to the variables without the this-keyword:

final List<String> tokens = new ArrayList<String>();
final List<String> lemmas = new ArrayList<String>();
final List<String> positions   = new ArrayList<String>();

tt.setHandler(new TokenHandler<String>() {
   @Override
   public void token(final String token, final String pos, final String lemma) {
      tokens.add(token); 
      lemmas.add(lemma); 
      positions.add(pos);
   }
});

For further information about why you need final see this question.

EDIT:

Also, be careful with the ambigous names (parameter list vs. method variables).

Upvotes: 4

kaysush
kaysush

Reputation: 4836

Instead of using this.token use OuterClass.this.token where OuterClass is the name of your class

Upvotes: 0

Related Questions