abstract demo: client class to access parent and child methods

CodingBlocks Training/Day16/clientAbstract.java

@@ -0,0 +1,47 @@
+package Lecture16;
+
+public class clientAbstract {
+
+	public static void main(String[] args) {
+
+		// not allowed
+		// parentAbstract obj = new parentAbstract(); // Cannot instantiate the type parentAbstract
+		// since parentAbstract class is abstract, you cannot make object of
+		// that class it can only be inherited
+
+		// not allowed
+		// childAbstract obj = new parentAbstract(); // Cannot instantiate the type parentAbstract
+
+		parentAbstract obj = new childAbstract();
+
+		obj.fun();
+		obj.fun1();
+		obj.fun2();
+
+		// not allowed as fun3() presence is checked in parentAbstract by compiler
+		// obj.fun3(); // The method fun3() is undefined for the type parentAbstract
+
+		System.out.println("=========================");
+
+		childAbstract obj2 = new childAbstract();
+
+		obj2.fun();
+		obj2.fun1();
+		obj2.fun2();
+		obj2.fun3();
+
+	}
+
+}
+
+
+/* output:
+Inside child fun
+Inside child fun1
+Inside parent fun2
+=========================
+Inside child fun
+Inside child fun1
+Inside parent fun2
+Inside child fun2
+*/