add ScalaBasic/TraitDemo.scala

README.md

@@ -26,6 +26,7 @@
 	- [ScalaClassDemo](https://github.com/yennanliu/utility_Scala/blob/master/src/main/scala/ScalaBasic/ScalaClassDemo.scala) - Scala `class` basic op, properties
 	- [OverrideDemo](https://github.com/yennanliu/utility_Scala/blob/master/src/main/scala/ScalaBasic/OverrideDemo.scala) - Scala `Override` basic op, properties
 	- [AbstractDemo](https://github.com/yennanliu/utility_Scala/blob/master/src/main/scala/ScalaBasic/AbstractDemo.scala) - Scala `Abstract` basic op, properties
+	- [TraitDemo](https://github.com/yennanliu/utility_Scala/blob/master/src/main/scala/ScalaBasic/TraitDemo.scala) - Scala `TraitDemo` basic op, properties
 
 4. Spark basic
 	- [Spark_basic_demo_1](https://github.com/yennanliu/utility_Scala/blob/master/src/main/scala/SparkBasic/spark_basic_demo_1.scala) - Spark `function `basic demo

src/main/scala/ScalaBasic/TraitDemo.scala

@@ -0,0 +1,16 @@
+package ScalaBasic
+
+object TraitDemo extends App {
+    trait Loggger{
+        def log(msg: String)
+    }
+
+    // extends the trait here
+    class ConsoleLogger extends Loggger {
+        def log(msg: String): Unit = {println(msg)}
+    } 
+
+    val x = new ConsoleLogger
+    println(x.log("123"))
+
+}