Java: type casting question

Question

Is there any way to do this in a single line:

    TextView tv = (TextView) findViewById(R.id.lbSightName);
    tv.setText("Some Text");

I would like to do away declaring the intermediary tv, like so:

(TextView) findViewById(R.id.lbSightName).setText("Some Text");

Not possible?

score 5 · Accepted Answer · answered Mar 21 '11 at 17:05

5

You can, but it isn't best practice

((TextView) findViewById(R.id.lbSightName)).setText("Some Text");
TextView.class.cast(findViewById(R.id.lbSightName).setText("Some Text");

answered Mar 21 '11 at 17:05

Stan Kurilin

Thanks, why not best practice? – Hein du Plessis Mar 21 '11 at 17:09
@Hein - You should prefer polymorphism / visitor pattern to instanceof/casting for dispatching in Java. – Stan Kurilin Mar 21 '11 at 17:18
@Hein - see my answer at http://stackoverflow.com/questions/4326017/implementing-generic-interface-in-java/4326117#4326117 , wiki (http://en.wikipedia.org/wiki/Visitor_pattern) , and GoF (http://en.wikipedia.org/wiki/Design_Patterns_%28book%29) for details – Stan Kurilin Mar 21 '11 at 17:33

score 4 · Answer 2 · answered Mar 21 '11 at 17:05

4

((TextView) findViewById(R.id.lbSightName)).setText("Some Text");

answered Mar 21 '11 at 17:05

Jan Zyka

score 2 · Answer 3 · answered Mar 21 '11 at 17:04

2

With one more set of parenthesis it should be possible:

((TextView)findViewById(R.id.lbSightName)).setText("Some Text");

answered Mar 21 '11 at 17:04

justkt

score 2 · Answer 4 · answered Mar 21 '11 at 17:04

2

((TextView) findViewById(R.id.lbSightName)).setText("Some Text");

Just add braces.

answered Mar 21 '11 at 17:04

paztulio

score 2 · Answer 5 · edited Jun 24 '11 at 15:22

2

Sure

((TextView) findViewById(R.id.lbSightName)).setText("Some Text");

edited Jun 24 '11 at 15:22

user229044

answered Mar 21 '11 at 17:05

score 1 · Answer 6 · answered Mar 21 '11 at 17:12

1

((TextView)findViewById(R.id.lbSightName)).setText("Some thingy");

Adding one more set of parenthesis does the trick

answered Mar 21 '11 at 17:12

Deepak

6 Answers6