Inheritance and public/private methods Code Answer

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public class One {

    private void run() {

    public void start() {;

public class Two extends One {
    public void run() {

public class Main {
    public static void main(String[] args) {
        Two t = new Two();

Output: one

But if I declare the run method public in the One class I get “two” as output.

It is pretty unpredictable, how does this work?


The run method in Two will not be overriding the private method in One, because it is private and inaccessible to any class outside One.

Once the method is marked as public, the inheritance system takes place, and run is invoked from start in One (as the method is not overridden), but then resolved dynamically (at runtime) as Two‘s run.

My advice, use the @Override annotation to make sure at compile-time that a method is properly overridden.

Also, you seem to be playing with start and run methods: remember you need to extend Thread or implement Runnable for the JVM to recognize your classes as Runnables.

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