Question

Draw memory diagrams for all variables and objects created using during the execution of main method below:

class Singleton {
    private int value;
    Singleton( int value ) {
        this.value = value;
    }
}

class Pair {
    private Object first;
    private Object second;
    Pair( Object first, Object second ) {
        this.first = first;
        this.second = second;
    }
}

public class Quiz {
    public static void main( String[] args ) {
        Singleton s;
        Pair p1, p2;

        s = new Singleton( 99 );
        p2 = new Pair( s, null );
        p1 = new Pair( s, p2 );
    }
}