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Java Tutorial : Java abstract class(abstract method)

A.java

abstract class A
{
    abstract void hi();

}

class B extends A
{
    void hi()
    {
        System.out.println("hi...");
    }

}

public class AbstractClassTest
{

    public static void main(String[] args)
    {
        B b = new B();
        b.hi();
    }

}