added programs to create many threads programatically

many_threads.rb

@@ -0,0 +1,18 @@
+# many_threads.rb
+
+def launch_thread string
+  thread = Thread.new do
+    3.times do
+      puts string
+      sleep rand(3)
+    end
+  end
+  return thread
+end
+
+threads = []
+threads << launch_thread("Hi")
+threads << launch_thread("Hello")
+
+threads.each {|t| t.join}
+

many_threads_1.rb

@@ -0,0 +1,20 @@
+# many_threads_1.rb
+
+def launch_thread string
+  thread = Thread.new do
+    3.times do
+      puts string
+      sleep rand(3)
+    end
+  end
+  return thread
+end
+
+threads = []
+
+4.times do |i|
+  threads << launch_thread("Thread #{i}")
+end
+
+threads.each {|t| t.join}
+