To sort a list of objects by date in Java, we need to make use of the Collections.sort() method along with a custom Comparator.
Sort by LocalDate:
Collections.sort(employees, Comparator.comparing(Employee::getDateOfBirth));
Example:
package org.code2care.examples;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class Employee {
private String name;
private LocalDate dateOfBirth;
public Employee(String name, LocalDate dateOfBirth) {
this.name = name;
this.dateOfBirth = dateOfBirth;
}
public String getName() {
return name;
}
public LocalDate getDateOfBirth() {
return dateOfBirth;
}
public static void main(String[] args) {
List<Employee> employees = new ArrayList<>();
employees.add(new Employee("Mike", LocalDate.of(1990, 4, 1)));
employees.add(new Employee("Sam", LocalDate.of(1985, 6, 5)));
employees.add(new Employee("Andy", LocalDate.of(1980, 9, 20)));
employees.add(new Employee("Andrew", LocalDate.of(1950, 12, 25)));
employees.add(new Employee("Eric", LocalDate.of(1995, 11, 12)));
Collections.sort(employees, Comparator.comparing(Employee::getDateOfBirth));
for (Employee employee : employees) {
System.out.println(employee.getName() + " - DoB: " + employee.getDateOfBirth());
}
}
}
Output:
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Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
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