In Java how can I access a variable from outside the anonymous class

Question

for example:

for (int i = 0; i < 10; i++){
   SomeClass something = new SomeClass();
   something.setOnClickListener(new OnClickListener() {
      public void onClick(){
         doSomething(i);
      }
   });
}

I am not allowed to use the variable i, Eclipse suggest me make the i final, but I cannot do that because I need it to iterate right?

score 6 · Accepted Answer · answered Nov 09 '13 at 06:21

6

Copy i to a final variable in the loop body.

for (int i = 0; i < 10; i++){
   final int j = i;
   SomeClass something = new SomeClass();
   something.setOnClickListener(new OnClickListener() {
      public void onClick(){
         doSomething(j);
      }
   });
}

answered Nov 09 '13 at 06:21

Matt Ball

354,903
100
647
710

+1 this seems logical – Juned Ahsan Nov 09 '13 at 06:25
+1 most IDEs will do this for you as an auto-fix. – Peter Lawrey Nov 09 '13 at 08:02

score 1 · Answer 2 · answered Nov 09 '13 at 06:22

1

You can do

loop with i
  final int k = i
  annonymousClass

answered Nov 09 '13 at 06:22

Lan

1,206
1
11
26

In Java how can I access a variable from outside the anonymous class

2 Answers2