diff --git a/OOP/Java/Lab/Week9/counts.java b/OOP/Java/Lab/Week9/counts.java
new file mode 100644
index 0000000..d4fbcbc
--- /dev/null
+++ b/OOP/Java/Lab/Week9/counts.java
@@ -0,0 +1,26 @@
+import java.util.Scanner;
+class counts{
+    public static void main(String[] args) {
+        Scanner in=new Scanner(System.in);
+        System.out.println("Enter the Lines...");
+        String str=in.nextLine();
+        str.trim();
+        int no=str.length();
+        System.out.println("Number of characters="+no);
+        String arr[]=str.split(" ");
+        System.out.println("Number of words="+arr.length);
+        String lines[]=str.split("\\.",0); // as \. to put a full stop and \\. to recognize \.
+        System.out.println("Number of Lines="+lines.length);
+        char characters[]=new char[no];
+        String lowstr=str.toLowerCase();
+        lowstr.getChars(0, no, characters, 0);
+        int i,count=0;
+        for(i=0;i<no;i++)
+        {
+            char cc=characters[i];
+            if(cc=='a'||cc=='e'||cc=='i'||cc=='o'||cc=='u')
+            count++;
+        }
+        System.out.println("Number of vowels="+count);
+    }
+}
\ No newline at end of file
diff --git a/OOP/Java/Lab/Week9/menu_main2.java b/OOP/Java/Lab/Week9/menu_main2.java
new file mode 100644
index 0000000..c3ae35b
--- /dev/null
+++ b/OOP/Java/Lab/Week9/menu_main2.java
@@ -0,0 +1,68 @@
+import java.util.Scanner;
+
+public class menu_main2 {
+
+    public int compare(String st1,String st2)
+    {
+        return st1.compareTo(st2);
+    }
+
+    public String caseConvert(String st)
+    {
+        String converted="";
+        for(int i=0;i<st.length();i++){
+            char ch = st.charAt(i);
+            if(Character.isUpperCase(ch)){
+                converted+=Character.toLowerCase(ch);
+            }
+            else{
+                converted+=Character.toUpperCase(ch);
+            }
+        }
+        return converted;
+    }
+
+    public boolean substring(String st,String sub)
+    {
+        return st.contains(sub);
+    }
+
+    public StringBuffer hello(String st,String sub)
+    {
+        int index = st.indexOf(sub);
+        StringBuffer sb = new StringBuffer(st);
+        sb.replace(index,index+sub.length(),"Hello");
+        return sb;
+    }
+
+    public static void main(String[] args) {
+        menu_main2 obj = new menu_main2();
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter:\na. To compare two strings\nb. To convert the uppercase character to lower and vice-versa\nc. To display whether an entered string is a substring of the other or not\nd. If the entered string is a substring of the other, replace it with Hello");
+        char choice = sc.nextLine().charAt(0);
+        System.out.println("Enter string");
+        String str1 = sc.nextLine();
+        String str2;
+        switch(choice)
+        {
+            case 'a':
+                System.out.println("Enter string to be checked");
+                str2 = sc.nextLine();
+                System.out.println("Comparison:"+obj.compare(str1,str2));
+                break;
+            case 'b':
+                System.out.println("String in converted case:"+obj.caseConvert(str1));
+                break;
+            case 'c':
+                System.out.println("Enter string to be checked");
+                str2 = sc.nextLine();
+                System.out.println("Is it a substring:"+obj.substring(str1,str2));
+                break;
+            case 'd':
+                System.out.println("Enter string to be checked");
+                str2 = sc.nextLine();
+                System.out.println("Substituting hello string is:"+obj.hello(str1,str2));
+                break;
+        }
+    }
+}
\ No newline at end of file
diff --git a/OOP/Java/Lab/Week9/palin_alpha_rev_concat.java b/OOP/Java/Lab/Week9/palin_alpha_rev_concat.java
new file mode 100644
index 0000000..afb0558
--- /dev/null
+++ b/OOP/Java/Lab/Week9/palin_alpha_rev_concat.java
@@ -0,0 +1,82 @@
+import java.util.Scanner;
+class palin_alpha_rev_concat{
+    static boolean palindrome(String str)
+    {
+        String rev=reverse(str);
+        return str.contentEquals(rev);
+    }
+    static String[] alphabetic(String str)
+    {
+        String arr[]=str.split(" ");
+        for(int i=0;i<arr.length-1;i++)
+        {
+            for(int j=0;j<arr.length-i-1;j++)
+            {
+                int a=arr[j].compareTo(arr[j+1]);
+                if(a>0)
+                {
+                    String temp=arr[j];
+                    arr[j]=arr[j+1];
+                    arr[j+1]=temp;
+                }
+            }
+        }
+        return arr;
+
+    }
+    static String reverse(String str)
+    {
+        StringBuffer rev=new StringBuffer(str);
+        rev.reverse();
+        String revstr=rev.toString();
+        return revstr;
+    }
+    static String concating(String str)
+    {
+        String rev=reverse(str);
+        return str+rev; 
+    }
+    
+    public static void main(String[] args) {
+        Scanner in=new Scanner(System.in);
+        System.out.println("Enter the String");
+        String str=in.nextLine();
+        char contin='y';
+        while(contin=='y'){
+            System.out.println("What do you want to do?1 for checking palindrome,2 for alphabetic,3 for reversing,4 for concatinatig with reverse");
+            int choice=in.nextInt();
+            switch(choice)
+            {
+                case 1:
+                {
+                    System.out.println("String is a palindrome:"+palindrome(str));
+                    break;
+                }
+                case 2:
+                {
+                    String arr[]=alphabetic(str);
+                    System.out.println("String in alphabetic order:");
+                    for(int i=0;i<arr.length;i++)
+                    {
+                        System.out.print(arr[i]+" ");
+                    }
+                    System.out.println();
+                    break;
+                }
+                case 3:
+                {
+                    System.out.println("Reversed string="+reverse(str));
+                    break;
+                }
+                case 4:
+                {
+                    System.out.println("Concatenated String="+concating(str));
+                    break;
+                }
+            }
+            System.out.println("Continue?(y/n)");
+            contin=in.next().charAt(0);
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/OOP/Java/Lab/Week9/search_name.java b/OOP/Java/Lab/Week9/search_name.java
new file mode 100644
index 0000000..3a1d011
--- /dev/null
+++ b/OOP/Java/Lab/Week9/search_name.java
@@ -0,0 +1,50 @@
+import java.util.Scanner;
+class Student {
+    int regNumber;
+    String firstName;
+    String lastName;
+    String degree;
+    Student(int regNumber, String firstName, String lastName, String degree) {
+        this.regNumber = regNumber;
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.degree = degree;
+    }
+}
+
+
+class search_name {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        Student[] students = new Student[5];
+
+        // Sample data: 5 students as an array of Student objects
+        students[0] = new Student(101, "John", "Doe", "Computer Science");
+        students[1] = new Student(102, "Jane", "Smith", "Engineering");
+        students[2] = new Student(103, "Bob", "Johnson", "Mathematics");
+        students[3] = new Student(104, "Alice", "Brown", "Physics");
+        students[4] = new Student(105, "Charlie", "Wilson", "History");
+
+        System.out.print("Search by (first_name/last_name): ");
+        String searchType = sc.nextLine().toLowerCase();
+        System.out.print("Enter the name to search: ");
+        String searchName = sc.nextLine().toLowerCase();
+        boolean found = false;
+        for (Student student : students) {
+            if ((searchType.equals("first_name") && student.firstName.toLowerCase().contains(searchName))
+                    || (searchType.equals("last_name") && student.lastName.toLowerCase().contains(searchName))) {
+                System.out.println("Found student:");
+                System.out.println("Registration Number: " + student.regNumber);
+                System.out.println("First Name: " + student.firstName);
+                System.out.println("Last Name: " + student.lastName);
+                System.out.println("Degree: " + student.degree);
+                System.out.println();
+                found = true;
+            }
+        }
+
+        if (!found) {
+            System.out.println("No student found with the provided name.");
+        }
+    }
+}
\ No newline at end of file