Keyboard compareapex sort list of objects by fieldone or more of the items in this list is not comparablecomparable interfaceKeyboard rankingLogitech G815 vs SteelSeries Apex ProApex list sortApex arrayComparable: Sorting Objects in Salesforce - Biswajeet Samal
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The Comparable interface adds sorting support for Lists that contain non-primitive types, that is, Lists of user-defined types.
TheComparableinterfaceaddssortingsupportforListsthatcontainnon-primitivetypes,thatis,Listsofuser-definedtypes.
ToaddListsortingsupportforyourApexclass,youmustimplementtheComparableinterfacewithitscompareTomethodinyourclass.
WhenaclassimplementstheComparableinterfaceithastoimplementamethodcalledcompareTo().ThismethodreturnsanIntegervaluethatistheresultofthecomparison.Inthatmethodthecodehastobewrittentodecideiftwoobjectsmatchorifoneislargerthantheother.
Theimplementationofthismethodshouldreturnthefollowingvalues:
0ifthisinstanceandobjectToCompareToareequal
>0ifthisinstanceisgreaterthanobjectToCompareTo
<0ifthisinstanceislessthanobjectToCompareTo
Let’stakealookatasimpleclassthattakesinanEmployeeobject,storestheemployee’sdatainitandallowsustosortalistofEmployeesbytheirEmployeeId.
ApexClass:
publicclassEmployeeimplementsComparable{
publicIntegerId;
publicStringName;
publicDecimalSalary;
publicEmployee(Integeri,Stringn,Decimals){
Id=i;
Name=n;
Salary=s;
}
publicIntegercompareTo(ObjectobjToCompare){
Employeeemp=(Employee)objToCompare;
if(Id==emp.Id){
return0;
}
elseif(Id>emp.Id){
return1;
}
else{
return-1;
}
}
}
ExecutethebelowcodeinDeveloperConsole.
List
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