I am reading "Java Concurrency in practice" and looking at the example code on page 51.

According to the book this piece of code is at risk of of failure if it has not been published properly. Because I like to code examples and break them to prove how they work. I have tried to make it throw an AssertionError but have failed. (Leading me to my previous question)

Can anyone post sample code so that an AssertionError is thrown? Rule: Do not modify the Holder class.

public class Holder{
private int n;

public Holder(int n){
    this.n = n;
}

public void assertSanity(){
    if (n != n) {
        throw new AssertionError("This statement is false");
    }
}
}

I have modified the class to make it more fragile but I still can not get an AssertionError thrown.

    class Holder2{
    private int n;
    private int n2;

    public Holder2(int n) throws InterruptedException{
        this.n = n;
        Thread.sleep(200);
        this.n2 = n;
    }

    public void assertSanity(){
        if (n != n2) {
            throw new AssertionError("This statement is false");
        }
    }
    }

Is it possible to make either of the above classes throw an AssertionError? Or do we have to accept that they may occasionally do so and we can't write code to prove it?