Clean up methods in practice files

Author: squidmin

src/main/java/practice/streamapi/ConstructorReferencesDemo.java

@@ -5,33 +5,6 @@
 
 public class ConstructorReferencesDemo {
 
-    static class Employee {
-        String name;
-        int age;
-        int salary;
-        Employee(String name) { this.name = name; }
-        Employee(String name, int age, int salary) {
-            this.name = name;
-            this.age = age;
-            this.salary = salary;
-        }
-
-        public String getName() { return name; }
-        public int getAge() { return age; }
-        public int getSalary() { return salary; }
-
-        @Override
-        public String toString() {
-            return "Employee{" +
-                "name='" + name + '\'' +
-                ", age=" + age +
-                ", salary=" + salary +
-                '}';
-        }
-    }
-
-    public int getLength(String str) { return str.length(); }
-
     public static void main(String[] args) {
         List<String> list = new ArrayList<>();
         list.add("we");

src/main/java/practice/streamapi/ConvertStringsToUppercase.java

@@ -5,14 +5,8 @@
 
 public class ConvertStringsToUppercase {
 
-    public static List<String> convertToUppercase(List<String> strings) {
-        return null;
-    }
-
     public static void main(String[] args) {
-        List<String> strings = List.of("apple", "banana", "orange", "pineapple", "grape");
-        List<String> uppercaseStrings = convertToUppercase(strings);
-        System.out.println("Uppercase strings: " + uppercaseStrings);
+
     }
 
 }

src/main/java/practice/streamapi/CountWordsLongerThan5Characters.java

@@ -4,14 +4,8 @@
 
 public class CountWordsLongerThan5Characters {
 
-    public static long countWordsLongerThanFiveChars(List<String> words) {
-        return -1;
-    }
-
     public static void main(String[] args) {
-        List<String> words = List.of("apple", "banana", "orange", "pineapple", "grape");
-        long count = countWordsLongerThanFiveChars(words);
-        System.out.println("Words longer than 5 characters: " + count);
+
     }
 
 }

src/main/java/practice/streamapi/FilterEvenNumbers.java

@@ -4,14 +4,8 @@
 
 public class FilterEvenNumbers {
 
-    public static List<Integer> filterEvenNumbers(List<Integer> numbers) {
-        return null;
-    }
-
     public static void main(String[] args) {
-        List<Integer> numbers = List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
-        List<Integer> evenNumbers = filterEvenNumbers(numbers);
-        System.out.println("Even numbers: " + evenNumbers);
+
     }
 
 }

src/main/java/practice/streamapi/FindAverageAgeOfEmployeesByDepartment.java

@@ -4,34 +4,10 @@
 import java.util.Map;
 import java.util.stream.Collectors;
 
-class Employee {
-    private final String name;
-    private final int age;
-    private final String title;
-    public Employee(String name, int age, String title) {
-        this.name = name;
-        this.age = age;
-        this.title = title;
-    }
-}
-
 public class FindAverageAgeOfEmployeesByDepartment {
 
-    public static Map<String, Double> averageAgeByDepartment(List<Employee> employees) {
-        return null;
-    }
-
     public static void main(String[] args) {
-        List<Employee> employees = List.of(
-            new Employee("Alice", 25, "HR"),
-            new Employee("Bob", 30, "Finance"),
-            new Employee("Charlie", 28, "HR"),
-            new Employee("David", 35, "Finance")
-        );
 
-        Map<String, Double> averageAgeByDept = averageAgeByDepartment(employees);
-        averageAgeByDept.forEach((dept, avgAge) ->
-            System.out.println("Average age in " + dept + ": " + avgAge));
     }
 
 }

src/main/java/practice/streamapi/FindMinimumAndMaximumNumbers.java

@@ -5,13 +5,8 @@
 
 public class FindMinimumAndMaximumNumbers {
 
-    public static void findMinMax(List<Integer> numbers) {
-
-    }
-
     public static void main(String[] args) {
-        List<Integer> numbers = List.of(3, 6, 2, 8, 4, 9, 1);
-        findMinMax(numbers);
+
     }
 
 }

src/main/java/practice/streamapi/FindMostFrequentWordsInListOfSentences.java

@@ -7,10 +7,6 @@
 
 public class FindMostFrequentWordsInListOfSentences {
 
-    public static List<String> mostFrequentWords(List<String> sentences) {
-        return null;
-    }
-
     public static void main(String[] args) {
         List<String> sentences = List.of(
             "Java is a programming language",
@@ -19,8 +15,8 @@ public static void main(String[] args) {
             "Java and Python are popular languages"
         );
 
-        List<String> frequentWords = mostFrequentWords(sentences);
-        System.out.println("Most frequent words: " + frequentWords);
+//        List<String> frequentWords = mostFrequentWords(sentences);
+//        System.out.println("Most frequent words: " + frequentWords);
     }
 
 }

src/main/java/practice/streamapi/FindSumOfSquares.java

@@ -4,14 +4,10 @@
 
 public class FindSumOfSquares {
 
-    public static int sumOfSquares(List<Integer> numbers) {
-        return -1;
-    }
-
     public static void main(String[] args) {
-        List<Integer> numbers = List.of(1, 2, 3, 4, 5);
-        int sum = sumOfSquares(numbers);
-        System.out.println("Sum of squares: " + sum);
+//        List<Integer> numbers = List.of(1, 2, 3, 4, 5);
+//        int sum = sumOfSquares(numbers);
+//        System.out.println("Sum of squares: " + sum);
     }
 
 }

src/main/java/practice/streamapi/FlattenNestedLists.java

@@ -5,18 +5,14 @@
 
 public class FlattenNestedLists {
 
-    public static List<Integer> flattenNestedLists(List<List<Integer>> nestedLists) {
-        return null;
-    }
-
     public static void main(String[] args) {
         List<List<Integer>> nestedLists = new ArrayList<>();
         nestedLists.add(List.of(1, 2, 3));
         nestedLists.add(List.of(4, 5));
         nestedLists.add(List.of(6, 7, 8));
 
-        List<Integer> flattenedList = flattenNestedLists(nestedLists);
-        System.out.println("Flattened list: " + flattenedList);
+//        List<Integer> flattenedList = flattenNestedLists(nestedLists);
+//        System.out.println("Flattened list: " + flattenedList);
     }
 
 }

src/main/java/practice/streamapi/GroupStudentsByAge.java

@@ -4,46 +4,22 @@
 import java.util.Map;
 import java.util.stream.Collectors;
 
-class Student {
-
-    private final String name;
-    private final int age;
-
-    public Student(String name, int age) {
-        this.name = name;
-        this.age = age;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public int getAge() {
-        return age;
-    }
-
-}
-
 public class GroupStudentsByAge {
 
-    public static Map<Integer, List<Student>> groupStudentsByAge(List<Student> students) {
-        return null;
-    }
-
     public static void main(String[] args) {
-        List<Student> students = List.of(
-            new Student("Alice", 20),
-            new Student("Bob", 22),
-            new Student("Charlie", 20),
-            new Student("David", 22)
-        );
-
-        Map<Integer, List<Student>> groupedByAge = groupStudentsByAge(students);
-        groupedByAge.forEach((age, studentList) -> {
-            System.out.println("Age " + age + ": " + studentList.stream()
-                .map(Student::getName)
-                .toList());
-        });
+//        List<Student> students = List.of(
+//            new Student("Alice", 20),
+//            new Student("Bob", 22),
+//            new Student("Charlie", 20),
+//            new Student("David", 22)
+//        );
+//
+//        Map<Integer, List<Student>> groupedByAge = groupStudentsByAge(students);
+//        groupedByAge.forEach((age, studentList) -> {
+//            System.out.println("Age " + age + ": " + studentList.stream()
+//                .map(Student::getName)
+//                .toList());
+//        });
     }
 
 }