Abstrct demo not work

1033862

Dear

i want to learn abstract classes and interface, i got this code from a web, but getting error when i compile it. error is below.

error (7,24):class abstractDemp.exmple1 can not be reference from static context:

public class AbstractDemo

{

 

  public static void main(String args[]){

Example4 obj=new Example4();         --- error showing here
  obj.display3();

     

    System.out.println("display1 method");

    System.out.println("display1 aaa method");

  }

class Example1{

     public void display1(){

        System.out.println("display1 method");

     }

  }

  abstract class Example2{

     public void display2(){

        System.out.println("display2 method");

     }

  }

   

  abstract class Example3 extends Example1{

     abstract void display3();

  }

   

  class Example4 extends Example2{

     public void display3(){

        System.out.println("display3 method");

     }

  }

   

 

 

}

Jiri.Machotka-Oracle

Take a look at these two links: https://docs.oracle.com/javase/tutorial/java/IandI/abstract.html and http://tutorials.jenkov.com/java/interfaces-vs-abstract-classes.html

The error is not related to abstract classes, but rather to improper use of static (btw, you don't share how the class abstractDemp looks like)

Unknown

i want to learn abstract classes and interface, i got this code from a web, but getting error when i compile it. error is below.
error (7,24):class abstractDemp.exmple1 can not be reference from static context:

Great! I suggest you start by reading, and trying the examples in, The Java Tutorials trails.

https://docs.oracle.com/javase/tutorial/java/IandI/abstract.html

Abstract Methods and Classes

An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.

Those trails have WORKING examples.

error (7,24):class abstractDemp.exmple1 can not be reference from static context:

Ok - but there is NO SUCH 'abstractDemp.exmple1' in what you posted. If you want help with code you have to POST THE CODE you need help with.

   

}