Java sort list by attribute

Sort list of objects by attribute java

ArrayList<Employee> employees = getUnsortedEmployeeList();
             
Comparator<Employee> compareById = (Employee o1, Employee o2) -> o1.getId().compareTo( o2.getId() );
 
Collections.sort(employees, compareById);
 
Collections.sort(employees, compareById.reversed());

Collections.sort custom comparator

ArrayList<Employee> employees = getUnsortedEmployeeList();
             
Comparator<Employee> compareById = (Employee o1, Employee o2) -> o1.getId().compareTo( o2.getId() );
 
Collections.sort(employees, compareById);
 
Collections.sort(employees, compareById.reversed());

Source: howtodoinjava.com

Java sort list by attribute

       List.sort((a, b) -> {
                if (a.value() > b.value()) {
                    return -1;
                }
                if (a.value() < b.value()) {
                    return 1;
                }
                return 0;
            });

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