Added Multi-thread executor

Author: ahmedrafat-SW

src/main/java/com/dev/thread/InitialThread.java

@@ -0,0 +1,31 @@
+package com.dev.thread;
+
+public class InitialThread extends Thread{
+
+    @Override
+    public synchronized void start() {
+        super.start();
+    }
+
+    @Override
+    public void run() {
+        System.out.println("Job-Thread- " +  this.getId());
+
+    }
+
+    @Override
+    public void interrupt() {
+        super.interrupt();
+    }
+
+    @Override
+    public State getState() {
+        return super.getState();
+    }
+
+    @Override
+    public long getId() {
+        return super.getId();
+    }
+
+}

src/main/java/com/dev/thread/MultiExecutor.java

@@ -0,0 +1,29 @@
+package com.dev.thread;
+
+import java.util.List;
+import java.util.ArrayList;
+
+public class MultiExecutor {
+
+    private List<Runnable> tasks;
+
+    public MultiExecutor(List<Runnable> tasks) {
+        this.tasks = tasks;
+    }
+
+    /**
+     * Starts and executes all the tasks concurrently
+     */
+    public void executeAll() {
+        List<Thread> threads = new ArrayList<>(tasks.size());
+
+        for(Runnable task : tasks){
+            Thread thread = new Thread(task);
+            threads.add(thread);
+        }
+
+        for(Thread thr : threads){
+            thr.start();
+        }
+    }
+}

src/main/java/com/dev/thread/ThreadExecutor.java

@@ -0,0 +1,24 @@
+package com.dev.thread;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ThreadExecutor {
+
+    public static void main(String[] args) {
+        InitialThread thread = new InitialThread();
+        System.out.println("before thread execution");
+        thread.start();
+        System.out.println("after thread execution");
+
+        List<Runnable> threads = new ArrayList<>();
+        for (int i = 0; i < 4; i++) {
+            threads.add(new Thread(() ->{
+                System.out.println(Thread.currentThread().getId() + " - " + Thread.currentThread().getName());
+            }));
+        }
+
+        MultiExecutor multiExecutor = new MultiExecutor(threads);
+        multiExecutor.executeAll();
+    }
+}