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?

Stan Kurilin · Accepted Answer · 2011-03-21 17:05:16Z

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, 2011 at 17:05

Stan Kurilin

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3 Comments

Hein du Plessis Over a year ago

Thanks, why not best practice?

Stan Kurilin Over a year ago

@Hein - You should prefer polymorphism / visitor pattern to instanceof/casting for dispatching in Java.

Stan Kurilin Over a year ago

@Hein - see my answer at stackoverflow.com/questions/4326017/… , wiki (en.wikipedia.org/wiki/Visitor_pattern) , and GoF (en.wikipedia.org/wiki/Design_Patterns_%28book%29) for details

Jan Zyka · Accepted Answer · 2011-03-21 17:05:10Z

4

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

answered Mar 21, 2011 at 17:05

Jan Zyka

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Comments

justkt · Accepted Answer · 2011-03-21 17:04:45Z

2

With one more set of parenthesis it should be possible:

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

answered Mar 21, 2011 at 17:04

justkt

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Comments

paztulio · Accepted Answer · 2011-03-21 17:04:46Z

2

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

Just add braces.

answered Mar 21, 2011 at 17:04

paztulio

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Comments

user229044 · Accepted Answer · 2011-06-24 15:22:09Z

2

Sure

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

edited Jun 24, 2011 at 15:22

user229044♦

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answered Mar 21, 2011 at 17:05

willcodejavaforfood

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Comments

Deepak · Accepted Answer · 2011-03-21 17:12:14Z

1

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

Adding one more set of parenthesis does the trick

answered Mar 21, 2011 at 17:12

Deepak

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