diff --git a/OOP/Java/Lab/Practice_question.java b/OOP/Java/Lab/Practice_question.java
new file mode 100644
index 0000000..4bca7d4
--- /dev/null
+++ b/OOP/Java/Lab/Practice_question.java
@@ -0,0 +1,126 @@
+// Online Java Compiler
+/*interface product
+{
+    void buy(int num);
+}
+class genproduct implements product
+{
+    int quan;
+    genproduct(int n)
+    {
+        quan=n;
+    }
+    public synchronized void buy(int num)
+    {
+        if(quan<num)
+        {
+            System.out.println("Erretysuor");
+        }
+        else{
+            System.out.println(num+" in start "+quan);
+            quan=quan-num;
+            System.out.println("succesfull "+quan);
+        }
+    }
+}
+
+class inventory<T extends product> extends Thread
+{
+    T obj;
+    int num;
+    inventory(T obj,int num)
+    {
+        this.obj=obj;
+        this.num=num;
+    }
+    public void run()
+    {
+        obj.buy(num);
+    }
+}
+class Mainclass
+{
+    public static void main(String[] args) {
+        genproduct buyer1 =new genproduct(15);
+        inventory<genproduct> t1=new inventory(buyer1,2);
+        inventory<genproduct> t2=new inventory(buyer1,5);
+       // obj.start();
+       t1.start();
+       t2.start();
+       
+       
+    }
+}*/
+class BankAccount {
+    private int balance;
+    private int accountNumber;
+
+    public BankAccount(int accountNumber, int initialBalance) {
+        this.accountNumber = accountNumber;
+        this.balance = initialBalance;
+    }
+
+    public synchronized void deposit(int amount) {
+        balance += amount;
+        System.out.println("Deposited: " + amount);
+        System.out.println("Current Balance after Deposit: " + balance);
+    }
+
+    public synchronized void withdraw(int amount) {
+        if (balance >= amount) {
+            balance -= amount;
+            System.out.println("Withdrawn: " + amount);
+            System.out.println("Current Balance after Withdrawal: " + balance);
+        } else {
+            System.out.println("Insufficient funds for withdrawal.");
+        }
+    }
+}
+
+class TransactionThread extends Thread {
+    private BankAccount account;
+    private boolean isDeposit;
+    private int amount;
+
+    public TransactionThread(BankAccount account, boolean isDeposit, int amount) {
+        this.account = account;
+        this.isDeposit = isDeposit;
+        this.amount = amount;
+    }
+
+    public void run() {
+        if (isDeposit) {
+            account.deposit(amount);
+        } else {
+            account.withdraw(amount);
+        }
+    }
+}
+
+class Practice_question{
+    public static void main(String[] args) {
+        BankAccount account = new BankAccount(12345, 1000);
+
+        // Create multiple threads for deposits and withdrawals
+        TransactionThread depositThread1 = new TransactionThread(account, true, 500);
+        TransactionThread withdrawThread1 = new TransactionThread(account, false, 200);
+        TransactionThread depositThread2 = new TransactionThread(account, true, 100);
+        TransactionThread withdrawThread2 = new TransactionThread(account, false, 300);
+
+        // Start the threads
+        depositThread1.start();
+        withdrawThread1.start();
+        depositThread2.start();
+        withdrawThread2.start();
+
+        // Wait for all threads to finish
+        try {
+            depositThread1.join();
+            withdrawThread1.join();
+            depositThread2.join();
+            withdrawThread2.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/OOP/Java/Lab/matrix_threaded.java b/OOP/Java/Lab/matrix_threaded.java
new file mode 100644
index 0000000..990bf26
--- /dev/null
+++ b/OOP/Java/Lab/matrix_threaded.java
@@ -0,0 +1,161 @@
+import java.util.Scanner;
+
+class Matrix {
+    static int[][] matrix;
+
+    Matrix(int rows, int columns) {
+        matrix = new int[rows][columns];
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the values");
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < columns; j++) {
+                matrix[i][j] = sc.nextInt();
+            }
+        }
+    }
+}
+
+class DisplayMatrixThread extends Thread {
+    static int[][] matrix;
+
+    DisplayMatrixThread(Matrix matrixObj) {
+        matrix = Matrix.matrix;
+    }
+
+    public void run() {
+        for (int[] row : matrix) {
+            for (int value : row) {
+                System.out.print(value + "\t");
+            }
+            System.out.println();
+        }
+    }
+}
+
+class TransposeMatrixThread extends Thread {
+    int[][] matrix;
+
+    TransposeMatrixThread(Matrix matrixObj) {
+        matrix = matrixObj.matrix;
+    }
+
+    public void run() {
+        int rows = matrix.length;
+        int columns = matrix[0].length;
+
+        for (int j = 0; j < columns; j++) {
+            for (int i = 0; i < rows; i++) {
+                System.out.print(matrix[i][j] + "\t");
+            }
+            System.out.println();
+        }
+    }
+}
+
+class MaxValueThread extends Thread {
+    static int[][] matrix;
+
+    MaxValueThread(Matrix matrixObj) {
+        matrix = Matrix.matrix;
+    }
+
+    public void run() {
+        int max = matrix[0][0];
+
+        for (int[] row : matrix) {
+            for (int value : row) {
+                if (value > max) {
+                    max = value;
+                }
+            }
+        }
+
+        System.out.println("Maximum value in the matrix: " + max);
+    }
+}
+
+class PrincipalDiagonalThread extends Thread {
+    static int[][] matrix;
+
+    PrincipalDiagonalThread(Matrix matrixObj) {
+        matrix = Matrix.matrix;
+    }
+
+    public void run() {
+        int rows = matrix.length;
+        int columns = matrix[0].length;
+
+        System.out.print("Principal Diagonal Elements: ");
+        for (int i = 0; i < Math.min(rows, columns); i++) {
+            System.out.print(matrix[i][i] + " ");
+        }
+        System.out.println();
+    }
+}
+
+class NonDiagonalThread extends Thread {
+    static int[][] matrix;
+
+    NonDiagonalThread(Matrix matrixObj) {
+        matrix = Matrix.matrix;
+    }
+
+    public void run() {
+        int rows = matrix.length;
+        int columns = matrix[0].length;
+
+        System.out.print("Non-Diagonal Elements: ");
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < columns; j++) {
+                if (i != j) {
+                    System.out.print(matrix[i][j] + " ");
+                }
+            }
+        }
+        System.out.println();
+    }
+}
+
+class ThreadMatrix {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the no. of rows and columns");
+        int rows = sc.nextInt();
+        int columns = sc.nextInt();
+        Matrix matrixObj = new Matrix(rows, columns);
+
+        DisplayMatrixThread t1 = new DisplayMatrixThread(matrixObj);
+        TransposeMatrixThread t2 = new TransposeMatrixThread(matrixObj);
+        MaxValueThread t3 = new MaxValueThread(matrixObj);
+        PrincipalDiagonalThread t4 = new PrincipalDiagonalThread(matrixObj);
+        NonDiagonalThread t5 = new NonDiagonalThread(matrixObj);
+
+        try {
+            t1.start();
+            System.out.println("\nThread t1 is alive: " + t1.isAlive());
+            t1.join();
+            t2.start();
+            System.out.println("\nThread t2 is alive: " + t2.isAlive());
+            t2.join();
+            t3.start();
+            System.out.println("\nThread t3 is alive: " + t3.isAlive());
+            t3.join();
+            t4.start();
+            System.out.println("\nThread t4 is alive: " + t4.isAlive());
+            t4.join();
+            t5.start();
+            System.out.println("\nThread t5 is alive: " + t5.isAlive());
+            t5.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        System.out.println("\nThread t1 is alive: " + t1.isAlive());
+        System.out.println("Thread t2 is alive: " + t2.isAlive());
+        System.out.println("Thread t3 is alive: " + t3.isAlive());
+        System.out.println("Thread t4 is alive: " + t4.isAlive());
+        System.out.println("Thread t5 is alive: " + t5.isAlive());
+        
+        System.out.println("\nMain thread exits.");
+    }
+}
\ No newline at end of file
diff --git a/OOP/Java/Lab/syncMethod.java b/OOP/Java/Lab/syncMethod.java
new file mode 100644
index 0000000..59a3419
--- /dev/null
+++ b/OOP/Java/Lab/syncMethod.java
@@ -0,0 +1,43 @@
+
+class Incrementer{
+    int count;
+    Incrementer(int cnt)
+    {
+        count=cnt;
+    }
+    synchronized void increment()
+    {
+        count++;
+    }
+}
+
+class IncrementThread extends Thread{
+    Incrementer ref;
+    IncrementThread(Incrementer obj)
+    {
+        ref=obj;
+    }
+    public void run()
+    {
+        for(int i=0;i<10000;i++)
+        {
+            ref.increment();
+        }
+    }
+}
+class syncMethod{
+    public static void main(String[] args) {
+        Incrementer inc=new Incrementer(0);
+        IncrementThread t1=new IncrementThread(inc);
+        IncrementThread t2=new IncrementThread(inc);
+        t1.start();
+        t2.start();
+        try {
+                t1.join();
+                t2.join();
+        } catch (InterruptedException e) {
+            System.out.println(e.toString());
+        }
+        System.out.println(inc.count);
+    }
+}
diff --git a/OOP/Java/Lab/syncStatements.java b/OOP/Java/Lab/syncStatements.java
new file mode 100644
index 0000000..e557deb
--- /dev/null
+++ b/OOP/Java/Lab/syncStatements.java
@@ -0,0 +1,44 @@
+class IncrementThread extends Thread{
+    Incrementer ref;
+    IncrementThread(Incrementer obj)
+    {
+        ref=obj;
+    }
+    public void run()
+    {
+        for(int i=0;i<10000;i++)
+        {
+            ref.increment();
+        }
+    }
+}
+class Incrementer{
+    int count;
+    Incrementer(int cnt)
+    {
+        count=cnt;
+    }
+    void increment()
+    {
+        synchronized(this)
+        {
+            count++;
+        }
+    }
+}
+class syncMethod{
+    public static void main(String[] args) {
+        Incrementer inc=new Incrementer(0);
+        IncrementThread t1=new IncrementThread(inc);
+        IncrementThread t2=new IncrementThread(inc);
+        t1.start();
+        t2.start();
+        try {
+                t1.join();
+                t2.join();
+        } catch (InterruptedException e) {
+            System.out.println(e.toString());
+        }
+        System.out.println(inc.count);
+    }
+}
diff --git a/OOP/Java/Lab/threadmaking.java b/OOP/Java/Lab/threadmaking.java
new file mode 100644
index 0000000..ac7eae6
--- /dev/null
+++ b/OOP/Java/Lab/threadmaking.java
@@ -0,0 +1,53 @@
+import java.util.Scanner;
+
+class MyRunnable implements Runnable {
+    public void run() {
+        System.out.println("Thread created by runnable ");
+        try {
+            Thread.sleep(500);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}
+
+class MyThread extends Thread {
+    public void run() {
+        System.out.println("Thread created by Thread class");
+        try {
+            Thread.sleep(500);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}
+
+class Threadmaking {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        while (true) {
+            System.out.println("\nChoose an option:");
+            System.out.println("1. Create Thread using Runnable Interface");
+            System.out.println("2. Create Thread by Inheriting Thread Class");
+            System.out.println("3. Exit");
+
+            int choice = sc.nextInt();
+
+            switch (choice) {
+                case 1:
+                    Thread runnableThread = new Thread(new MyRunnable());//creating a runnable object which is directly passed to Thread
+                    runnableThread.start();
+                    break;
+                case 2:
+                    MyThread myThread = new MyThread();
+                    myThread.start();
+                    break;
+                case 3:
+                    System.exit(0);
+                default:
+                    System.out.println("Invalid choice. Please enter a valid option.");
+            }
+        }
+    }
+}
\ No newline at end of file