How does a ArrayList's contains() method evaluate objects?

Question

Say I create one object and add it to my ArrayList. If I then create another object with exactly the same constructor input, will the contains() me

Answer 1

I think that right implementations should be

public class Thing
{
    public int value;  

    public Thing (int x)
    {
        this.value = x;
    }

    @Override
    public boolean equals(Object object)
    {
        boolean sameSame = false;

        if (object != null && object instanceof Thing)
        {
            sameSame = this.value == ((Thing) object).value;
        }

        return sameSame;
    }
}