number formatting in java
Hi,
I am looking at below example
http://www.avajava.com/tutorials/lessons/how-do-i-use-numberformat-to-format-doubles.html
I wonder what is math.pow function is. I have not understood below output
how we got it
please advise
Any links resources ideas highly appreciated. Thanks in advance
Format:default
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589
formatted:25.133 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3,216.991 | unformatted:3216.990877275
formatted:49,087.385 | unformatted:49087.38521234
formatted:879,444.881 | unformatted:879444.8810753
formatted:18,110,656.471 | unformatted:1.811065647100
formatted:421,657,428.266 | unformatted:4.216574282663
formatted:10,954,056,258.8
formatted:314,159,265,358.
Format:min fraction digits 2, max fraction digits 4
formatted:0.00 | unformatted:0.0
formatted:3.1416 | unformatted:3.141592653589
formatted:25.1327 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3,216.9909 | unformatted:3216.990877275
formatted:49,087.3852 | unformatted:49087.38521234
formatted:879,444.8811 | unformatted:879444.8810753
formatted:18,110,656.471 | unformatted:1.811065647100
formatted:421,657,428.2663
formatted:10,954,056,258.8
formatted:314,159,265,358.
Format:min integer digits 6
formatted:000,000 | unformatted:0.0
formatted:000,003.142 | unformatted:3.141592653589
formatted:000,025.133 | unformatted:25.13274122871
formatted:000,254.469 | unformatted:254.4690049407
formatted:003,216.991 | unformatted:3216.990877275
formatted:049,087.385 | unformatted:49087.38521234
formatted:879,444.881 | unformatted:879444.8810753
formatted:18,110,656.471 | unformatted:1.811065647100
formatted:421,657,428.266 | unformatted:4.216574282663
formatted:10,954,056,258.8
formatted:314,159,265,358.
Format:max integer digits 5
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589
formatted:25.133 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3,216.991 | unformatted:3216.990877275
formatted:49,087.385 | unformatted:49087.38521234
formatted:79,444.881 | unformatted:879444.8810753
formatted:10,656.471 | unformatted:1.811065647100
formatted:57,428.266 | unformatted:4.216574282663
formatted:56,258.833 | unformatted:1.095405625883
formatted:65,358.979 | unformatted:3.141592653589
Format:grouping off
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589
formatted:25.133 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3216.991 | unformatted:3216.990877275
formatted:49087.385 | unformatted:49087.38521234
formatted:879444.881 | unformatted:879444.8810753
formatted:18110656.471 | unformatted:1.811065647100
formatted:421657428.266 | unformatted:4.216574282663
formatted:10954056258.833 | unformatted:1.095405625883
formatted:314159265358.979
I am looking at below example
http://www.avajava.com/tutorials/lessons/how-do-i-use-numberformat-to-format-doubles.html
I wonder what is math.pow function is. I have not understood below output
how we got it
please advise
Any links resources ideas highly appreciated. Thanks in advance
Format:default
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589
formatted:25.133 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3,216.991 | unformatted:3216.990877275
formatted:49,087.385 | unformatted:49087.38521234
formatted:879,444.881 | unformatted:879444.8810753
formatted:18,110,656.471 | unformatted:1.811065647100
formatted:421,657,428.266 | unformatted:4.216574282663
formatted:10,954,056,258.8
formatted:314,159,265,358.
Format:min fraction digits 2, max fraction digits 4
formatted:0.00 | unformatted:0.0
formatted:3.1416 | unformatted:3.141592653589
formatted:25.1327 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3,216.9909 | unformatted:3216.990877275
formatted:49,087.3852 | unformatted:49087.38521234
formatted:879,444.8811 | unformatted:879444.8810753
formatted:18,110,656.471 | unformatted:1.811065647100
formatted:421,657,428.2663
formatted:10,954,056,258.8
formatted:314,159,265,358.
Format:min integer digits 6
formatted:000,000 | unformatted:0.0
formatted:000,003.142 | unformatted:3.141592653589
formatted:000,025.133 | unformatted:25.13274122871
formatted:000,254.469 | unformatted:254.4690049407
formatted:003,216.991 | unformatted:3216.990877275
formatted:049,087.385 | unformatted:49087.38521234
formatted:879,444.881 | unformatted:879444.8810753
formatted:18,110,656.471 | unformatted:1.811065647100
formatted:421,657,428.266 | unformatted:4.216574282663
formatted:10,954,056,258.8
formatted:314,159,265,358.
Format:max integer digits 5
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589
formatted:25.133 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3,216.991 | unformatted:3216.990877275
formatted:49,087.385 | unformatted:49087.38521234
formatted:79,444.881 | unformatted:879444.8810753
formatted:10,656.471 | unformatted:1.811065647100
formatted:57,428.266 | unformatted:4.216574282663
formatted:56,258.833 | unformatted:1.095405625883
formatted:65,358.979 | unformatted:3.141592653589
Format:grouping off
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589
formatted:25.133 | unformatted:25.13274122871
formatted:254.469 | unformatted:254.4690049407
formatted:3216.991 | unformatted:3216.990877275
formatted:49087.385 | unformatted:49087.38521234
formatted:879444.881 | unformatted:879444.8810753
formatted:18110656.471 | unformatted:1.811065647100
formatted:421657428.266 | unformatted:4.216574282663
formatted:10954056258.833 | unformatted:1.095405625883
formatted:314159265358.979
ASKER CERTIFIED SOLUTION
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The reason for the separate calls to displayNumbers is to demonstrate how to use the class "NumberFormat".
Here is java page for NumberFormat: http://docs.oracle.com/javase/7/docs/api/java/text/NumberFormat.html
You start execution in your main routine with this code:
DisplayNumbers itself takes 2 parameters.
1st Parameter - is a string to display... like a descriptive header.
2nd Parameter - is an instance of NumberFormat
Then in the display routine... it loops from zero to ten every time it is called as described in previous post in this question.
Each time DisplayNumbers is called... it passes in a different instance of "NumberFormat" so that you can visualize how the number formatting impacts the display of numbers.
The first call displays what it looks like when you didn't do anything with NumberFormat object.
(the above instructs the formatting to use a minimum of 2 decimal places and maximum of 4).
The resulting display is shown with this output:
Note in this output... the unformatted number doesn't change... but the formatted number now has a minimum of 2 decimal places and a maximum of 4.
minimum is shown by "0.00"
Maximum is shown by all other rows: 3.1416 for example the 1416 to the right of the decimal is the max # of decimal places that this formatting allows.
Here is java page for NumberFormat: http://docs.oracle.com/javase/7/docs/api/java/text/NumberFormat.html
You start execution in your main routine with this code:
NumberFormat format1 = NumberFormat.getInstance();DisplayNumbers itself takes 2 parameters.
1st Parameter - is a string to display... like a descriptive header.
2nd Parameter - is an instance of NumberFormat
Then in the display routine... it loops from zero to ten every time it is called as described in previous post in this question.
Each time DisplayNumbers is called... it passes in a different instance of "NumberFormat" so that you can visualize how the number formatting impacts the display of numbers.
The first call displays what it looks like when you didn't do anything with NumberFormat object.
Format:default
formatted:0 | unformatted:0.0
formatted:3.142 | unformatted:3.141592653589793
formatted:25.133 | unformatted:25.132741228718345
formatted:254.469 | unformatted:254.46900494077323
formatted:3,216.991 | unformatted:3216.990877275948
formatted:49,087.385 | unformatted:49087.385212340516
formatted:879,444.881 | unformatted:879444.8810753123
formatted:18,110,656.471 | unformatted:1.8110656471007094E7
formatted:421,657,428.266 | unformatted:4.216574282663131E8
formatted:10,954,056,258.833 | unformatted:1.0954056258833088E10
formatted:314,159,265,358.979 | unformatted:3.141592653589793E11 format2.setMinimumFractionDigits(2);
format2.setMaximumFractionDigits(4);(the above instructs the formatting to use a minimum of 2 decimal places and maximum of 4).
The resulting display is shown with this output:
Note in this output... the unformatted number doesn't change... but the formatted number now has a minimum of 2 decimal places and a maximum of 4.
minimum is shown by "0.00"
Maximum is shown by all other rows: 3.1416 for example the 1416 to the right of the decimal is the max # of decimal places that this formatting allows.
Format:min fraction digits 2, max fraction digits 4
formatted:0.00 | unformatted:0.0
formatted:3.1416 | unformatted:3.141592653589793
formatted:25.1327 | unformatted:25.132741228718345
formatted:254.469 | unformatted:254.46900494077323
formatted:3,216.9909 | unformatted:3216.990877275948
formatted:49,087.3852 | unformatted:49087.385212340516
formatted:879,444.8811 | unformatted:879444.8810753123
formatted:18,110,656.471 | unformatted:1.8110656471007094E7
formatted:421,657,428.2663 | unformatted:4.216574282663131E8
formatted:10,954,056,258.8331 | unformatted:1.0954056258833088E10
formatted:314,159,265,358.9793 | unformatted:3.141592653589793E11ASKER
NumberFormat is the abstract base class for all number formats. This class provides the interface for formatting and parsing numbers
what is the meaning of parsing the numbers. Please advise
ASKER
DisplayNumbers itself takes 2 parameters.
I do not see the above method in below link
http://docs.oracle.com/javase/7/docs/api/java/text/NumberFormat.html
Where that method is defined.
format2.setMinimumFractionDigits(2);
format2.setMaximumFractionDigits(4);
format2.setMinimumFractionDigits(2);
format2.setMaximumFractionDigits(4);
what is meaning of setting maximum fraction digits.
Each subsequent call shows a different setting for NumberFormat.what is the meaning of setting for format.
Please advise
SOLUTION
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gudii9.... this is getting ridiculous.
You need to give credit when a question is answered.
You seem to want to ask an endless supply of questions IN JUST ONE QUESTION.
This is a never ending cycle. I and other experts have also answered many of your other questions which you never seem to want to close or give credit for.
You need to decide whether the original question has been answered or not. If it has been answered you need to give credit for it.
If it has not been answered you need to ask for clarification on it.
If you have a different question (which you obviously have in endless supply) then you need to open up an entirely new question.
You need to give credit when a question is answered.
You seem to want to ask an endless supply of questions IN JUST ONE QUESTION.
In this question you have asked the following:
I wonder what is math.pow function is. I have not understood below output
how we got it
what is the difference between above two loops. Why they have separate loops for 'default' and then also 'off'. please advise
what is the meaning of parsing the numbers. Please advise
what is meaning of setting maximum fraction digits.
This is a never ending cycle. I and other experts have also answered many of your other questions which you never seem to want to close or give credit for.
You need to decide whether the original question has been answered or not. If it has been answered you need to give credit for it.
If it has not been answered you need to ask for clarification on it.
If you have a different question (which you obviously have in endless supply) then you need to open up an entirely new question.
ASKER
I see they generated some number and then applying their own formatting with help of API mthods like set Grouping off, set Max fraction digits etc.
ASKER
what is the difference between above two loops. Why they have separate loops for 'default' and then also 'off'. please advise