diff --git a/lr12/e2.java b/lr12/e2.java
new file mode 100644
index 0000000..640d990
--- /dev/null
+++ b/lr12/e2.java
@@ -0,0 +1,25 @@
+package lr12;
+
+public class e2 {
+    public static void main(String[] args) {
+        Thread t1 = new Thread(() -> {
+            for (int i = 1; i <= 10; i++) {
+                System.out.println(i);
+
+                try {
+                    Thread.sleep(1000);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        });
+
+        t1.start();
+
+        try {
+            t1.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/lr12/e3.java b/lr12/e3.java
new file mode 100644
index 0000000..36b6b37
--- /dev/null
+++ b/lr12/e3.java
@@ -0,0 +1,24 @@
+package lr12;
+
+public class e3 {
+    public static void main(String[] args) {
+        Thread evenThread = new Thread(() -> {
+            for (int i = 1; i <= 10; i++) {
+                if (i % 2 == 0) {
+                    System.out.println("Even: " + i);
+                }
+            }
+        });
+
+        Thread oddThread = new Thread(() -> {
+            for (int i = 1; i <= 10; i++) {
+                if (i % 2 != 0) {
+                    System.out.println("Odd: " + i);
+                }
+            }
+        });
+
+        evenThread.start();
+        oddThread.start();
+    }
+}
diff --git a/lr12/e4.java b/lr12/e4.java
new file mode 100644
index 0000000..7992acf
--- /dev/null
+++ b/lr12/e4.java
@@ -0,0 +1,15 @@
+package lr12;
+
+public class e4 {
+    public static void main(String[] args) {
+        for (int i = 0; i < 10; i++) {
+            final int threadNumber = i;
+
+            Thread t = new Thread(() -> {
+                System.out.println("Thread # " + threadNumber);
+            });
+
+            t.start();
+        }
+    }
+}
diff --git a/lr12/e5.java b/lr12/e5.java
new file mode 100644
index 0000000..f5420b4
--- /dev/null
+++ b/lr12/e5.java
@@ -0,0 +1,21 @@
+package lr12;
+
+import java.util.Arrays;
+
+public class e5 {
+    public static int findMax(int[] arr) {
+        if (arr == null || arr.length == 0) {
+            throw new IllegalArgumentException("Empty");
+        }
+
+        return Arrays.stream(arr)
+                .parallel()
+                .max()
+                .getAsInt();
+    }
+
+    public static void main(String[] args) {
+        int[] arr = { 3, 8, 1, 99, 4, 12, 7, 45, -5, 88 };
+        System.out.println("Max: " + findMax(arr));
+    }
+}
diff --git a/lr12/e6.java b/lr12/e6.java
new file mode 100644
index 0000000..d717e6d
--- /dev/null
+++ b/lr12/e6.java
@@ -0,0 +1,20 @@
+package lr12;
+
+import java.util.Arrays;
+
+public class e6 {
+    public static long sum(int[] arr) {
+        if (arr == null || arr.length == 0) {
+            return 0;
+        }
+
+        return Arrays.stream(arr)
+                .parallel()
+                .sum();
+    }
+
+    public static void main(String[] args) {
+        int[] array = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 128, 512 };
+        System.out.println("Sum = " + sum(array));
+    }
+}