A a = new A();
    A b = new A();

    a == b;
    a.equals(b);

    if (a == b) {
        ...
    }


    String s1 = "abc";
    String s2 = "abc";
    
    if (s1 == s2) {
        // sose fut le
    }

    if (s1.equals(s2)) {
        // le tud futni
    }


class C
{
    T t = new T();
}


C c1 = new C();
C c2 = new C();



int i = 10;
A a = new A();
A a2 = f(i, a);



A f(A a1, int i1)
{
    return a1;
}