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Easy Learn Java: Programming Articles, Examples and Tips - Page 29


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I want to erase text in a TextArea. I want to use some function clear(), clearA

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Question: I want to erase text in a TextArea. I want to use some function clear(), clearAll(), erase() but there are not in API...
How someone supposed to do it?

Answer: It is very simple, just use
textArea.setText("");

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Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on site tips you can find here



26 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Sunday, March 16, 2003 (03:54:17) (10076 reads)

I just started with Java and found very strange that in simple operation like

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Question: I just started with Java and found very strange that in simple operation like:

float a = 31.335f;
float b = 12.2362f;
float result = a + b
gives
43.571200000000005 not 43.5712
Why?

Even more:
if I do simple operation
d = a + b;
d = d - b;
it will not give exactly the value of "a":
31.335 not equal to 31.334997?

Answer:
The reason is that computers usually use counting based on base 2, not 10 and if we use float variables then they often can not be exactly converted to binary number.
For doubles it is the same.
The result depends on particular case. Same numbers can be exactly converted. Not all. You should keep in mind that.

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Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on site tips you can find here



128 comments | Printer Friendly Page  Send to a Friend | Score: 4
Posted by jalex on Sunday, March 16, 2003 (03:47:42) (6548 reads)

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