Question

Hi the below is my program , could you please tell me why the first condition is ot being executed ??

  package com;

import java.util.ArrayList;
import java.util.List;

public class Test {

    public static void main(String args[]) {

        List<String> values = null;

        String Id = "1234";

        if (values != null && Id != null && values.size() > 1
                && !values.contains(Id)) {
// This is never executed
            System.out.println("Throw Exception");

        } else {
// This is always called
            System.out.println("Fine");

        }

    }
}

Answer 1

You always end up in the else case, because values is null and your if condition needs values != null.

Maybe you should have a look at basic Boolean Algebra to understand why the if condition cannot be true in your case.