diff --git a/Week 7/LinkedHashSetOperations.java b/Week 7/LinkedHashSetOperations.java
new file mode 100644
index 0000000..24f2293
--- /dev/null
+++ b/Week 7/LinkedHashSetOperations.java	
@@ -0,0 +1,83 @@
+import java.util.*;
+public class LinkedHashSetOperations {
+    public static void main(String[] args) {
+        linkedhashset operation = new linkedhashset();
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter the number of tests: ");
+        int testNumber = scanner.nextInt();
+        for (int i = 0; i < testNumber; i++) {
+            System.out.print("Enter the number of operations: ");
+            int numberOfOperations = scanner.nextInt();
+            for (int j = 0; j < numberOfOperations; j++) {
+                chooseOperation(operation);
+            }
+        }
+    }
+    private static void chooseOperation(linkedhashset operations){
+        int number;
+        Scanner scan = new Scanner(System.in);
+
+        System.out.print("Enter an operation: ");
+        String operation = scan.next();
+
+        switch (operation) {
+            case "a":
+                number = scan.nextInt();
+                operations.addValue(number);
+                break;
+
+            case "b":
+                operations.printSortedLinkedHashSet();
+                break;
+
+            case "c":
+                number = scan.nextInt();
+                operations.removeElement(number);
+                break;
+
+            case "d":
+                number = scan.nextInt();
+                operations.findNumber(number);
+                break;
+
+            case "e":
+                operations.getSize();
+                break;
+
+            case "f":
+                operations.printElement();
+
+            default:
+                System.out.println("Choose a valid option");
+        }
+    }
+    private static class linkedhashset{
+        LinkedHashSet<Integer> operations;
+        public linkedhashset(){
+            operations = new LinkedHashSet<>();
+        }
+        private void addValue(int number){
+            operations.add(number);
+        }
+        private void printSortedLinkedHashSet(){
+            List<Integer> sortedNumbers = new ArrayList<>(operations);
+            Collections.sort(sortedNumbers);
+            for (Integer n : sortedNumbers) System.out.print(n + " ");
+            System.out.println();
+        }
+        private void printElement(){
+            for(Integer item: operations) System.out.print(item + " ");
+            System.out.println();
+        }
+        private void removeElement(int number){
+            operations.remove(number);
+        }
+        private void findNumber(int number){
+            System.out.println(operations.contains(number));
+        }
+        private void getSize(){
+            System.out.println(operations.size());
+        }
+    }
+}
diff --git a/Week 7/TreeMapOperations.java b/Week 7/TreeMapOperations.java
new file mode 100644
index 0000000..511e1ff
--- /dev/null
+++ b/Week 7/TreeMapOperations.java	
@@ -0,0 +1,75 @@
+import java.util.*;
+public class TreeMapOperations {
+    public static void main(String[] args) {
+        treemap map = new treemap();
+        Scanner scanner = new Scanner(System.in);
+        System.out.print("Enter the number of tests: ");
+        int testNumber = scanner.nextInt();
+
+        for (int i = 0; i < testNumber; i++) {
+            System.out.print("Enter the number of operations: ");
+            int numberOfOperations = scanner.nextInt();
+            for (int j = 0; j < numberOfOperations; j++) {
+                chooseOperation(map);
+            }
+        }
+    }
+
+     public static void chooseOperation(treemap map) {
+         int value, key;
+         Scanner scan = new Scanner(System.in);
+         System.out.print("Enter an operation: ");
+         String operation = scan.next();
+
+         switch (operation) {
+             case "a":
+                 key = scan.nextInt();
+                 value = scan.nextInt();
+                 map.addValue(key,value);
+                 break;
+
+             case "b":
+                 key = scan.nextInt();
+                 map.findKey(key);
+                 break;
+
+             case "c":
+                 map.getSize();
+                 break;
+
+             case "d":
+                 key = scan.nextInt();
+                 map.removeElement(key);
+                 break;
+
+             case "e":
+                 map.printElements();
+                 break;
+
+             default:
+                 System.out.println("Choose a valid option");
+         }
+     }
+
+    static class treemap{
+        Map<Integer,Integer> operations;
+        public treemap() {
+            operations= new TreeMap<>();
+        }
+        private void addValue(int key,int value){
+            operations.put(key,value);
+        }
+        private void findKey(int key){
+            if(operations.containsKey(key)) System.out.println(operations.get(key)); else System.out.println(-1);
+        }
+        private void getSize(){
+            System.out.println(operations.size());
+        }
+        private void removeElement(int key){
+            System.out.println(operations.remove(key));
+        }
+        private void printElements(){
+            for(Map.Entry m: operations.entrySet()) System.out.println(m.getKey() + ":" + m.getValue());
+        }
+    }
+}
diff --git a/Week 7/WordDictionary.java b/Week 7/WordDictionary.java
new file mode 100644
index 0000000..30081ac
--- /dev/null
+++ b/Week 7/WordDictionary.java	
@@ -0,0 +1,39 @@
+import java.util.*;
+
+public class WordDictionary {
+
+    public static void main(String[]args){
+        wordDictionary dict = new wordDictionary();
+        dict.addWord("apple");
+        dict.addWord("astronaut");
+        dict.addWord("ball");
+        dict.addWord("camera");
+        dict.addWord("dress");
+        dict.printValues('a');
+        dict.printDictionary();
+    }
+
+    static class wordDictionary {
+        Map<Character,ArrayList<String>> wordDictionary;
+        public wordDictionary(){
+            wordDictionary = new HashMap<>();
+            for(char c='a';c<'z';c++){
+                wordDictionary.put(c,new ArrayList<>());
+            }
+        }
+        public void addWord(String word){
+            for(Map.Entry m : wordDictionary.entrySet())
+                if(m.getKey().equals(word.charAt(0))) wordDictionary.get(m.getKey()).add(word);
+        }
+        public void printDictionary(){
+            for(Map.Entry m : wordDictionary.entrySet()){
+                System.out.println(m.getKey() + ": " + m.getValue());
+            }
+        }
+        public void printValues(char key){
+            System.out.println(wordDictionary.get(key));
+        }
+    }
+}
+
+
diff --git a/Week 7/set.java b/Week 7/set.java
new file mode 100644
index 0000000..738baa9
--- /dev/null
+++ b/Week 7/set.java	
@@ -0,0 +1,75 @@
+import java.util.*;
+class set {
+    public static void main(String[] args) {
+        SetOperations operation = new SetOperations();
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter the number of tests: ");
+        int testNumber = scanner.nextInt();
+        for (int i = 0; i < testNumber; i++) {
+            System.out.print("Enter the number of operations: ");
+            int numberOfOperations = scanner.nextInt();
+            for (int j = 0; j < numberOfOperations; j++) {
+                chooseOperation(operation);
+            }
+        }
+    }
+    private static void chooseOperation(SetOperations operation){
+        int number;
+        Scanner scan = new Scanner(System.in);
+        System.out.print("Enter an operation: ");
+        String query = scan.next();
+
+        switch (query) {
+            case "a":
+                number = scan.nextInt();
+                operation.addValue(number);
+                break;
+
+            case "b":
+                operation.printSortedSet();
+                break;
+
+            case "c":
+                number = scan.nextInt();
+                operation.removeElement(number);
+                break;
+
+            case "d":
+                number = scan.nextInt();
+                operation.findNumber(number);
+                break;
+
+            case "e":
+                operation.getSize();
+                break;
+
+            default:
+                System.out.println("Choose a valid option");
+        }
+    }
+    private static class SetOperations{
+        Set<Integer> operations;
+        public SetOperations(){
+            operations = new HashSet<>();
+        }
+        private void addValue(int number){
+            operations.add(number);
+        }
+        private void printSortedSet(){
+            List<Integer> sortedNumbers = new ArrayList<>(operations);
+            Collections.sort(sortedNumbers);
+            for (Integer n : sortedNumbers) System.out.print(n + " ");
+            System.out.println();
+        }
+        private void removeElement(int number){
+            operations.remove(number);
+        }
+        private void findNumber(int number){
+            System.out.println(operations.contains(number));
+        }
+        private void getSize(){
+            System.out.println(operations.size());
+        }
+    }
+}