I have written a code to show the implementation of abstract class in java

mritunjay7065 · web-flow · commit 1e1ee72b8216 · 2020-10-05T19:47:19.000+05:30
diff --git a/Abstract_Class_Example.java b/Abstract_Class_Example.java
@@ -0,0 +1,137 @@
+//Subscribed by Mritunjay Kumar
+//https://www.facebook.com/Mritunjay70/posts/1445812775628125
+abstract class Person {
+	String name;
+	int age;
+	
+	Person() {
+		
+	}
+	Person(String n, int r) {
+		name = n;
+		age = r;
+	}
+	
+	void setData(String name1, int age1)
+	{
+		name = name1;
+		age = age1;
+	}
+	
+	void printDetails()
+	{
+		System.out.print("Name: "+name+"  Age: "+age);
+	}
+	
+	abstract void exceptional();
+	
+	final void isAdult() {
+		if (age > 18) System.out.println("\t Yes");
+	}
+}  // class Person ends
+
+class Student extends Person
+{
+	double cpi;
+	
+	Student() {
+		
+	}
+	Student(String n, int r, double c) {
+		
+		super(n, r);
+		cpi = c;
+	}
+	
+	void setData(String name1, int age1, double cpi1)
+	{
+		super.setData(name1, age1);
+		cpi = cpi1;
+	}
+	
+	void printDetails()
+	{
+		System.out.println();
+		super.printDetails();
+		System.out.print(" CPI: "+cpi);
+	}
+	
+	void f() {
+		
+	}
+	
+	void exceptional()
+	{
+		if (cpi > 9.5) System.out.print("   Exceptional ");
+	}
+
+	void isAdult(Person p) { 
+		
+	}
+} // class Student ends here
+
+abstract class test extends Student {
+	abstract void f();
+	void f2(){
+		
+	}
+}
+
+class Faculty extends Person
+{
+	float noOfPub;
+	
+	Faculty() {
+		
+	}
+	Faculty(String n, int r, float nop) {
+		super(n, r);
+		noOfPub = nop;
+	}
+	
+	void setData(String name1, int age1, int nop)
+	{
+		super.setData(name1, age1);
+		noOfPub = nop;
+	}
+	
+	void printDetails()
+	{
+		System.out.println();
+		super.printDetails();
+		System.out.print(" No of Pub: "+noOfPub);
+	}
+	
+	void exceptional()
+	{
+		if (noOfPub > 100) System.out.print("   Exceptional ");
+	}
+}
+
+public class AbstractDemo {
+
+	public static void main(String[] args)
+	{
+		Student s1 = new Student(), s2 = new Student();
+		Faculty f1 = new Faculty(), f2 = new Faculty();
+		
+		s1.setData("A", 10, 9.7); s2.setData("B", 10, 7.0);
+		f1.setData("C", 70, 300); f2.setData("D", 75, 50);
+		
+		Person [] p= new Person[4];
+		
+		p[0] = s1;
+		p[1] = s2;
+		p[2] = f1;
+		p[3] = f2;
+		
+		for (int index=0; index<p.length; index++)
+		{
+			p[index].printDetails();
+			p[index].exceptional();
+			p[index].isAdult();
+		}
+		
+	}
+
+}
