Given:
1. class X {
2. private Y y;
3. public X(Y y) { this.y = y; }
4. }
5. class Y {
6. private X x;
7. public Y() { }
8. public Y(X x) { this.x = x; }
9. }
The instance variable y is intended to represent the composition relationship "X is composed of Y".
Which code correctly maintains this meaning?

Question

Accepted Answer

A. X x1 = new X(new Y());
X x2 = new X(new Y());

Answer

B. X xx = new X(null);
Y y1 = new Y(xx);
Y y2 = new Y(xx);

Answer

C. X x1 = new Y();
X x1 = new Y(yy);
X x2 = new Y(xy);

Answer

D. Y y1 = new Y(new X(null));
Y y2 = new Y(new X(null));

Given: 1. class X { 2. private Y y; 3. public X(Y y) { this.y = y; } 4. } 5. class Y { 6. private X x; 7. public Y() { } 8. public Y(X x) { this.x = x; } 9. } The instance variable y is intended to…

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