Mini article raw type in java (#7142)

* Raw type example implementation

core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/rawtype/RawTypeDemo.java

@@ -0,0 +1,25 @@
+package com.baeldung.rawtype;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class RawTypeDemo {
+
+	public static void main(String[] args) {
+		RawTypeDemo rawTypeDemo = new RawTypeDemo();
+		rawTypeDemo.methodA();
+	}
+
+	public void methodA() {
+		// parameterized type
+		List<String> listStr = new ArrayList<>();
+		listStr.add("Hello Folks!");
+		methodB(listStr);
+		String s = listStr.get(1); // ClassCastException at run time
+	}
+
+	public void methodB(List rawList) { // Inexpressive raw type
+		rawList.add(1); // Unsafe operation
+	}
+
+}