Thread use to find max and min in an array of objects??

Hello everyone,
I need to find the min and max int value in a array of Objects.
This has to be done using threads--like divide the entire array into 10 or so blocks and find the local min and max in each block., Each block is run on a thread and finally comparing them to find the global max and min.How should I do this? I am new to Java programming and in particular to threads.
Thanks for your time and patience in answering this newbie question.
JP

Hi,
if i understand your problem, you have a big array with a lot of int values and you need to create a few arrays with a part of the big one in each, next each in a thread find the max and the min, next return the max and the min of each thread and compare these max and min to obtain the globals max and min?
In that case you can create a class in which is your big array. you create a second class implementing Runnable, in its creator you put the instance of the
first class and 2 int which are the beginning and the ending index. in this class add a method run in this method you create a loop to compare the current value to the max and min values, and you replace if you need to do. In the first class you put the main where you create a few instance of the second class in a thread :
private Thread threadName = new Thread(new SecondClass(this, start, end));
Next you start all these thread:
threadName.start();
At the end of the run method of the second class you have to write your result in the max and min fields of the first class(int type, you have to create it)
Write it only if it's necessary (if the current max is > than the already existing max).
I think it's complete!
Sorry if it's not really easy to understand, I'm french, but you can answer if you have more questions.
S�bastien

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Hello all, i am into this intro to java class. my assignment is to write a program that prompts the user for two integers and then prints the sum, difference, average, product , distance (absolute value of the difference) Maximum(largest of the two) and Minimum(smallest fo the two) here is my code so far
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.Math;
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catch (IOException e)
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Thanks alot man, sheesh i do not know why my book
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btw,
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How to get Max and Min in one line .

Hi Guys
I know the program which I did is stupid .. I am getting the result for max and min value?
But I how can I get the value of km, h, lit in one line
Equno..max_date,min_date,min_value_km..max_value_km....min_value_h...max_value_h...min_value_l...max_value_l
with my program i am getting the vlaue of max and min value but not in one line.
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Can anyone tell me the logic please
REPORT ZFUEL LINE-SIZE 200 LINE-COUNT 75
NO STANDARD PAGE HEADING.
TABLES : equi,
equz,
imptt,
imrg,
eqkt,
iloa.
Type Declaration
TYPES: BEGIN OF ty_data ,
equnr type equnr, " Euipment no
eqktx type eqkt-eqktx, " Equipment Text
eqfnr type iloa-eqfnr, " Equipment Sort field
idate type imrg-idate, " Measuring Date
recdu type imrg-recdu, " Unit of measuring ='KM','L','H'
recdv type imrg-recdv, " Counter reading data
END OF ty_data.
TYPES: BEGIN OF ty_final,
equnr type equnr, " Equipment no
eqktx type eqkt-eqktx, " Equipment Text
eqfnr type iloa-eqfnr, " Equipment Sort field
min_date type imrg-idate, " Min Date
min_km type p decimals 2, " Max Km
max_km type p decimals 2, " Min km
t_max_min_km type i, " Total min_km-max_km
max_date type imrg-idate, " Max Date
min_hr type imrg-recdv, " Max hr
max_hr type imrg-recdv, " Min hr
t_max_min_hr type i, " Total min_hr-max_hr
min_lit type imrg-recdv, " Max lit
max_lit type imrg-recdv, " Min lit
t_max_min_lit type i, " Total min_lit-max_lit
fuel_con type p decimals 2, " Total_hrs / t_max_min_hr
km_l type p decimals 2, " km / L
lit_per_hr type i , " fuel comsumed / t_max_min_hr
END OF ty_final.
DATA: i_data TYPE TABLE OF ty_data, " internal table
wa_data TYPE ty_data, " work area
i_final TYPE TABLE OF ty_final, " internal table
wa_final TYPE ty_final. " work area
data: begin of itab occurs 0,
num type i,
end of itab.
data: v_min_1 type i,
v_max_1 type i,
min_km like imrg-recdv,
max_km like imrg-recdv,
min_l like imrg-recdv,
max_l like imrg-recdv,
max_dt like imrg-idate,
min_dt like imrg-idate,
t_ma_mi type p decimals 2,
V1 LIKE IMRG-RECDV ,
V2 LIKE IMRG-RECDV .
SELECTION-SCREEN BEGIN OF BLOCK blk WITH FRAME.
SELECTION-SCREEN BEGIN OF BLOCK blk1 WITH FRAME TITLE text-001.
SELECT-OPTIONS: p_equnr FOR equi-equnr ,"no-extension no intervals,
p_idate FOR imrg-idate. "NO-EXTENSION NO INTERVALS OBLIGATORY,
"p_recdu FOR imrg-recdu NO-EXTENSION NO INTERVALS default 'KM' OBLIGATORY.
SELECTION-SCREEN END OF BLOCK blk1.
SELECTION-SCREEN BEGIN OF BLOCK blk2 WITH FRAME TITLE text-002.
SELECTION-SCREEN END OF BLOCK blk2.
SELECTION-SCREEN END OF BLOCK blk.
TOP-OF-PAGE.
FORMAT INTENSIFIED ON.
WRITE:/1(40) ' INVESTMENT LIMITED '.
WRITE:/50(40) ' FUEL CONSUMPTION REPORT ' CENTERED ,
2 'Page', sy-pagno.
FORMAT INTENSIFIED OFF.
WRITE:/50(40) '----
' CENTERED .
FORMAT INTENSIFIED ON.
WRITE:/2 sy-datum COLOR 3, sy-uzeit .
"WRITE:/1 S903-SPMON ."p_yearf.
ULINE.
"CENTERED.
write: /2 'Date From :'.
write: /2 'Equipment No :'.
write: /2 'Unit :'.
SKIP.
ULINE.
WRITE:/1 sy-vline,
2 'EQUIP NO', 10 sy-vline,
11 'NAME', 40 sy-vline,
41 'min date', 50 sy-vline,
51 'max date', 60 sy-vline,
61 'min km', 70 sy-vline,
71 'max km' , 80 sy-vline,
81 't_max_min_km', 90 sy-vline,
91 'min hr', 100 sy-vline,
101 'max hr', 110 sy-vline,
111 't_max_min_hr' , 120 sy-vline,
121 'min lit', 130 sy-vline,
131 'max lit', 140 sy-vline,
141 't_max_min_lit', 150 sy-vline,
151 'fuel con', 160 sy-vline,
161 'km_l', 170 sy-vline,
171 'lit_per_hr', 180 sy-vline.
FORMAT COLOR 3 ON.
ULINE.
END-OF-PAGE.
START-OF-SELECTION.
select aequnr deqktx feqfnr eidate erecdu erecdv
into table i_data
from equi AS a
inner join equz as b
on aequnr = bequnr
inner join iloa as f
on biloan = filoan
inner join imptt as c
on aobjnr = cmpobj
inner join eqkt as d
on aequnr = dequnr
inner join imrg as e
on epoint = cpoint
where a~equnr in p_equnr
and
e~idate in p_idate
and
e~recdu = 'KM'.
        SORT i_data BY equnr idate descending .
        loop at i_data into wa_data.
        max_km = wa_data-recdv.
        min_km = wa_data-recdv.
    at new equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,'MAX KM',max_km EXPONENT 0 DECIMALS 2 color 7,wa_data-recdu .
    endat.
at end of equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,'MIN KM', min_km EXPONENT 0 DECIMALS 2 color 7, wa_data-recdu .
endat.
at end of equnr.
write: / '----
write: /50(80) 'Subtotal' COLOR 4 .
write:/ '----
endat.
endloop.
select aequnr deqktx feqfnr eidate erecdu erecdv
into table i_data
from equi AS a
inner join equz as b
on aequnr = bequnr
inner join iloa as f
on biloan = filoan
inner join imptt as c
on aobjnr = cmpobj
inner join eqkt as d
on aequnr = dequnr
inner join imrg as e
on epoint = cpoint
where a~equnr in p_equnr
and
e~idate in p_idate
and
e~recdu = 'L'.
        SORT i_data BY equnr idate descending .
        loop at i_data into wa_data.
        max_km = wa_data-recdv.
        min_km = wa_data-recdv.
    at new equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,'MAX LIT',max_km EXPONENT 0 DECIMALS 2 color 7,wa_data-recdu .
    endat.
at end of equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,'MIN LIT', min_km EXPONENT 0 DECIMALS 2 color 7, wa_data-recdu .
endat.
at end of equnr.
write: / '----
write: /50(80) 'Subtotal' COLOR 4 .
write:/ '----
endat.ENDLOOP.
select aequnr deqktx feqfnr eidate erecdu erecdv
into table i_data
from equi AS a
inner join equz as b
on aequnr = bequnr
inner join iloa as f
on biloan = filoan
inner join imptt as c
on aobjnr = cmpobj
inner join eqkt as d
on aequnr = dequnr
inner join imrg as e
on epoint = cpoint
where a~equnr in p_equnr
and
e~idate in p_idate
and
e~recdu = 'H'.
        SORT i_data BY equnr idate descending .
        loop at i_data into wa_data.
        max_km = wa_data-recdv.
        min_km = wa_data-recdv.
    at new equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,'MAX H',max_km EXPONENT 0 DECIMALS 2 color 7,wa_data-recdu .
    endat.
at end of equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,'MIN H', min_h EXPONENT 0 DECIMALS 2 color 7, wa_data-recdu .
endat.
at end of equnr.
write: / '----
write: /50(80) 'Subtotal' COLOR 4 .
write:/ '----
endat.
endloop.

Hi Guys
How can I split the max and min value with if condition for KM L AND H as below
I am getting the km value correctly but rest fields for L and H (lit and hours) it is not ?
Please comment.
*APPEND wa_data to i_data.
        SORT i_data BY equnr idate descending .
        loop at i_data into wa_data.
        if wa_data-recdu = 'KM'.
        max_km = wa_data-recdv.
        min_km = wa_data-recdv.
        endif.
        if wa_data-recdu ='H'.
        max_h = wa_data-recdv.
        min_h = wa_data-recdv.
        endif.
        if wa_data-recdu ='L'.
        max_l = wa_data-recdv.
        min_l = wa_data-recdv.
       endif.
    at new equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,
        'Min KM',min_km EXPONENT 0 DECIMALS 2 color 7 ,
         'Min H',min_h EXPONENT 0 DECIMALS 2 color 7 ,
          'Min L',min_l EXPONENT 0 DECIMALS 2 color 7.
    endat.
at end of equnr.
        read table i_data into wa_data index sy-tabix.
        write:/ wa_data-equnr, wa_data-eqktx ,wa_data-eqfnr ,wa_data-idate ,
        'Max KM', max_km EXPONENT 0 DECIMALS 2 color 7,
        'Max H', max_h EXPONENT 0 DECIMALS 2 color 7,
        'Max L', max_l EXPONENT 0 DECIMALS 2 color 7.
endat.
regards
Piroz

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Thread use to find max and min in an array of objects??

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