Sorting of Primitive Data Types like (eg. List of student names) is easy in collection. But suppose you have a scenario like below,.
Thursday,May4,2017
HowtoSortWrapperclassCollectioninApex
SortingofPrimitiveDataTypeslike(eg.Listofstudentnames)iseasyincollection.
Butsupposeyouhaveascenariolikebelow,
Youhavealistofemployees(WrapperClass).
SaythisEmployeewrappercontainsfewprimitivetypelikecompareToEmpl.emplInst.empName){
//Setreturnvaluetoapositivevalue.
returnValue=1;
}elseif(emplInst.empNamegetListOfEmpNameAsSortedOrder(){
ListlstOfEmps=newList();
lstOfEmps=getListOfEmployee();
System.debug('Simplelistofemployee:::::::::::::::'+lstOfEmps);
ListlstOfSortedEmps=newList();
for(EmployeeWrapperEgempIns:lstOfEmps){
lstOfSortedEmps.add(newEmployeeComparatorEg(empIns));
}
lstOfSortedEmps.sort();
System.debug('Sortedlistbyname:::::::::::::::'+lstOfSortedEmps);
returnlstOfSortedEmps;
}
/**Initializelistofemployeewrapper.ForsimplicityIhavemakeitmanually.
*Itcanbesetfromdifferentsourcelikedatabaseoranyexternalsystem.
*/
privatestaticListgetListOfEmployee(){
ListlstOfEmps=newList();
EmployeeWrapperEgepm1=newEmployeeWrapperEg();
epm1.empName='Mark';
epm1.empId='E-100';
epm1.empSalary=10000;
EmployeeWrapperEgepm2=newEmployeeWrapperEg();
epm2.empName='Jon';
epm2.empId='E-102';
epm2.empSalary=9000;
EmployeeWrapperEgepm3=newEmployeeWrapperEg();
epm3.empName='Luce';
epm3.empId='E-101';
epm3.empSalary=9500;
lstOfEmps.add(epm1);
lstOfEmps.add(epm2);
lstOfEmps.add(epm3);
returnlstOfEmps;
}
}
###########FromAnonymousWindowcall getListOfEmpNameAsSortedOrder()methodofabove EmployeeComparatorTestEgclasstocheck
thenormalandsortedlistofemployeeindebuglog.###########
ExecutethebelowlineofcodeinAnonymouswindow.
EmployeeComparatorTestEg.getListOfEmpNameAsSortedOrder();
Output:
15:32:48:013USER_DEBUG[10]|DEBUG|Simplelistofemployee:::::::::::::::
(EmployeeWrapperEg:[empId=E-100,empName=Mark,empSalary=10000.0],
EmployeeWrapperEg:[empId=E-102,empName=Jon,empSalary=9000.0],
EmployeeWrapperEg:[empId=E-101,empName=Luce,empSalary=9500.0])
15:32:48:014USER_DEBUG[18]|DEBUG|Sortedlistbyname:::::::::::::::
(EmployeeComparatorEg:[emplInst=EmployeeWrapperEg:[empId=E-102,empName=Jon,empSalary=9000.0]],
EmployeeComparatorEg:[emplInst=EmployeeWrapperEg:[empId=E-101,empName=Luce,empSalary=9500.0]],
EmployeeComparatorEg:[emplInst=EmployeeWrapperEg:[empId=E-100,empName=Mark,empSalary=10000.0]])
at
May04,2017
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