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Thread: Abstract and code output

  1. #1
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    Default Abstract and code output

    Please explain me the output

    Output is : 0



    class ClassOne
    {
        int methodOne(int i, int j)
        {
            return i++ + ++j - ++i - j++;
        }
    }
     
    abstract class ClassTwo extends ClassOne
    {
        abstract int methodOne(int i, int j, int k);
     
        @Override
        int methodOne(int i, int j)
        {
            return methodOne(i, j, i+j);
        }
    }
     
    class ClassThree extends ClassTwo
    {
        @Override
        int methodOne(int i, int j, int k)
        {
            return --i - j-- + ++k - i++ + ++j - k--;
        }
    }
     
    public class MainClass
    {
        public static void main(String[] args)
        {
            ClassOne one = new ClassOne();
     
            ClassThree three = new ClassThree();
     
            System.out.println(three.methodOne(one.methodOne(10101, 20202), one.methodOne(20202, 10101)));
        }
    }

  2. #2
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    Default Re: Abstract and code output

    To explain the output, you need to first understand how the increment operators work. Are you having trouble understanding the difference between j++ and ++j, for instance?

  3. #3
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    Default Re: Abstract and code output

    I was searching online as I had to write an essay on how java has been the programming language that has ruled the world for so long when I landed on this post. I was reading an article regarding it and it was explained very wonderfully there. You can view it here. I would like to also say to you that you need to get familiar with the concept of preprocessors and postprocessors as your question is based on them and they are the basics of any programming language.

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