How to sort last name as first level of sorting and first name as second level of sorting

Question

In this code, sorting is done according to last name only. What I need to do is sort last name as first level of sorting and first name as second level of sorting.

   public int compare(Object aO1, Object aO2) {
    SearchResultAccount acct1 = (SearchResultAccount) aO1;
    String lastName1 = acct1.getLastName();
    SearchResultAccount acct2 = (SearchResultAccount) aO2;
    String lastName2 = acct2.getLastName();

    return lastName1.compareTo(lastName2);
}

I want last name sorted as first level of sorting and first name as second level of sorting

question is not clear. please add input and expected output . — SSP, Sep 25 '19 at 06:56
`list.sort(Comparator.comparing(Person::getLastName).thenComparing(Person::getFirstName))`. This has been asked a million times already. — JB Nizet, Sep 25 '19 at 06:56

score 0 · Answer 1 · answered Sep 25 '19 at 06:57

public int compare(Object aO1, Object aO2)
{
    SearchResultAccount acct1 = (SearchResultAccount) aO1;
    SearchResultAccount acct2 = (SearchResultAccount) aO2;

    int lastNameComparision = acct1.getLastName().compareTo(acct2.getLastName());
    if (lastNameComparision != 0) {
        return lastNameComparision;
    } else {
        return acct1.getFirstName().compareTo(acct2.getFirstName());
    }     
}

How to sort last name as first level of sorting and first name as second level of sorting

1 Answers1