Add Employee model and utility classes for employee data processing

Author: kumarcodes

src/main/java/com/superthirty/AllEmployeesHavingEmailQ6.java

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+package com.superthirty;
+
+import java.util.List;
+
+public class AllEmployeesHavingEmailQ6 {
+    public static void main(String[] args) {
+        List<Employee> employees = EmployeeDTO.getEmployees();
+        boolean isAllHaivngEmail = employees.stream().allMatch(x -> x.getEmail() != null);
+        employees.stream().filter(x -> x.getEmail() == null).forEach(System.out::println);
+        System.out.println(isAllHaivngEmail);
+    }
+}

src/main/java/com/superthirty/EmailActiveEmployeeQ7.java

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+package com.superthirty;
+
+import java.util.List;
+
+public class EmailActiveEmployeeQ7 {
+    public static void main(String[] args) {
+        List<Employee> employees = EmployeeDTO.getEmployees();
+        employees.stream().filter(x -> x.isActive()).map(Employee::getName).forEach(System.out::println);
+    }
+}

src/main/java/com/superthirty/HighestSalary.java

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+package com.superthirty;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.Optional;
+
+public class HighestSalary {
+    public static void main(String[] args) {
+        List<Employee> employees = EmployeeDTO.getEmployees();
+        //First Approach Using sorted and findFirst
+        String result = employees.stream()
+                .sorted(Comparator.comparing(Employee::getSalary).reversed())
+                .map(Employee::getName).toList().stream().findFirst().orElse(null);
+        System.out.println(result);
+        //Second Approach Using max
+
+        Optional<Employee> resultUsinngMax = employees.stream().max(Comparator.comparingDouble(Employee::getSalary));
+        System.out.println(resultUsinngMax);
+    }
+}