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Main.java

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+class Parent {
+	void parentMethod(){
+	System.out.println("This is parent class");
+
+	}
+}
+	class Child extends Parent{
+	void childMethod(){
+	System.out.println("This is child  class");
+	}
+
+
+}
+public class Main 
+{public static void main(String[] args) {
+		Parent p= new Parent();
+		Child c= new Child(); 
+		p.parentMethod(); //method of parent by object of parent
+
+		c.childMethod();//method of child class by object of child class
+		c.parentMethod();//method of parent class by object of child class
+	}
+}