Question

I have a Java class as

class Students{
    private String fName;   
    private String lName;
    private String uName;


    public Students(String fName, String lName, String uName) {
            this.fName = fName;
            this.lName = lName;
            this.uName = uName;
     }      

    public String getuName() {
        return uName;
    }
    public void setuName(String uName) {
        this.uName = uName;
    }
    public String getfName() {
        return fName;
    }
    public void setfName(String fName) {
        this.fName = fName;
    }
    public String getlName() {
        return lName;
    }
    public void setlName(String lName) {
        this.lName = lName;
    }

}

Now I have objects created as;

    Students students1 = new Students("har","mat","harmat");
    Students students2 = new Students("pan","son","panson");
    Students students3 = new Students("yogi","jos","yogijos");

    Students students4 = new Students("har","mat","harmat");
    Students students5 = new Students("pan","son","harmat");
    Students students6 = new Students("yogi","jos","someotherUName");
    Students students7 = new Students("yogi","jos","someotherUName2");

Now all these objects get added to combinedList

List combinedList = new ArrayList<SchoolStudents>();

I want to remove duplicate objects from this combinedList based on the following criteria;
if fName is same OR if uName is same.

Answer 1

If that is a general criteria to determine if 2 students are equals, you could override equals and hashcode in your class to make 2 students equal based on your criteria.

You can then add the students to a set (typically a HashSet, which will automatically remove the duplicate.