June 2018 Update

Task/Object-serialization/Julia/object-serialization.julia

@@ -0,0 +1,37 @@
+abstract type Hello end
+
+struct HelloWorld <: Hello
+    name::String
+    HelloWorld(s) = new(s)
+end
+
+struct HelloTime <: Hello
+    name::String
+    tnew::DateTime
+    HelloTime(s) = new(s, now())
+end
+
+sayhello(hlo) = println("Hello to this world, $(hlo.name)!")
+
+sayhello(hlo::HelloTime) = println("It is now $(now()). Hello from back in $(hlo.tnew), $(hlo.name)!")
+
+h1 = HelloWorld("world")
+h2 = HelloTime("new world")
+
+sayhello(h1)
+sayhello(h2)
+
+fh = open("objects.dat", "w")
+serialize(fh, h1)
+serialize(fh,h2)
+close(fh)
+
+sleep(10)
+
+fh = open("objects.dat", "r")
+hh1 = deserialize(fh)
+hh2 = deserialize(fh)
+close(fh)
+
+sayhello(hh1)
+sayhello(hh2)