CODEWITHSUNDEEP
java
iShower
iShower

Reputation: 79

compare two list of objects in Java to remove duplicate

I have two list of Objects. I have framed this list by querying the database.

For Ex: 

List<Employee> firstList={holDate,holName,createdby,empId}
List<Employee> seconList={holDate,holName,createdby,empId}

Now, I need to compare holDate, holName of firstList with holDate, holName of secondList. If holDate, holName of firstList not found in secondList, I need to add that in separate list.

The list may be in any order.

NOTE: empId is a primary key column.

Update - what I've tried:

for(Employee emp:firstList) { 
    for(Employee tgtEmp:seconList) {  
        if((emp.getHolDate()!=tgtEmp.getHolDate())&& (emp.getHolName()!=tgtEmp.getHolName())){ 
            printList.add(emp); break; 
        } 
    }
}

Sample List Values:

firstList={{2015-08-15,"Independence Day","e1","Empl"},{2015-01-26,"Republic Day","e1","Empl"},{2015-09-20,"Memorial Day","e1","Empl"}}
seconList={{2015-08-15,"Independence Day","e1","Emp2"},{2015-10-25,"Thanks Giving Day","e1","Emp2"}}

Here, newlist should have all the values which is available in seconList and "RepublicDay","MemorialDay" from firstList

Upvotes: 1

Views: 8255

Answers (2)

Ganesa Vijayakumar
Ganesa Vijayakumar

Reputation: 2602

I think the above answer is not generically. Think if you add any new field on the Emp object then you need to update the equals method. If you are open to accepting new solution then please consider the below answer

Assert List in Junit

Upvotes: 0

vels4j
vels4j

Reputation: 11298

Check this

 for (Employee emp : firstList) {
        boolean found=false;
        for (Employee tgtEmp : seconList) {
            if ((emp.getHolDate().equals(tgtEmp.getHolDate())) && (emp.getHolName().equals(tgtEmp.getHolName()))) {
                found=true;
                break;
            }
        }
        if(!found){
            printList.add(emp);
        }
    }

Upvotes: 1

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