Learn PL/SQL Part 3- PL/SQL Tutorial

Click here to download it

PL/SQL Part 3 from Gurpreet Singh

Learn PL/SQL Part 2 - PL/SQL Tutorial

Click here to download it

PL/SQL Part 2 from Gurpreet Singh

Learn PL/SQL Part 1- PL/SQL Tutorial

Click here to download it

PL/SQL Part 1 from Gurpreet Singh

How to use Comparator in java?

import java.util.*;

class ComparatorTest {
    public static void main(String[] args) {
        List list = new ArrayList<>();
        list.add(new Employee("B", 3));
        list.add(new Employee("A", 1));
        list.add(new Employee("C", 2));

        Collections.sort(list, new EmployeeComparator());
        for (Employee emp : list) {
            System.out.println(emp.name + "\t" + emp.age);
        }
    }
}

class EmployeeComparator implements Comparator<Employee> {
    @Override
    public int compare(Employee o1, Employee o2) {
        if (o1.age > o2.age) {
            return -1;
        } else {
            return 1;
        }
    }
}

class Employee {
    String name;
    int age;

    public Employee(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

Output:

B 3
C 2
A 1