多項選擇題

Which two are true about has-a and is-a relationships？（）

A. Inheritance represents an is-a relationship.
B. Inheritance represents a has-a relationship.
C. Interfaces must be used when creating a has-a relationship.
D. Instance variables can be used when creating a has-a relationship.

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多項選擇題

Which four are true？（）

A. Has-a relationships should never be encapsulated.
B. Has-a relationships should be implemented using inheritance.
C. Has-a relationships can be implemented using instance variables.
D. Is-a relationships can be implemented using the extends keyword.
E. Is-a relationships can be implemented using the implements keyword.
F. An array or a collection can be used to implement a one-to-many has-a relationship.
G. The relationship between Movie and Actress is an example of an is-a relationship.

多項選擇題

public class Team extends java.util.LinkedList {
public void addPlayer（Player p） {
add（p）；
}
public void compete（Team opponent） { /* more code here / }
}
class Player { / more code here */ }
Which two are true？（）

A. This code will compile.
B. This code demonstrates proper design of an is-a relationship.
C. This code demonstrates proper design of a has-a relationship.
D. A Java programmer using the Team class could remove Player objects from a Team object.

Which two are true about has-a and is-a relationships？（）

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Which four are true？（）

public class Team extends java.util.LinkedList { public void addPlayer（Player p） { add（p）； } public void compete（Team opponent） { /* more code here */ } } class Player { /* more code here */ } Which two are true？（）

Which two are true about has-a and is-a relationships？（）

public class Team extends java.util.LinkedList {
public void addPlayer（Player p） {
add（p）；
}
public void compete（Team opponent） { /* more code here / }
}
class Player { / more code here */ }
Which two are true？（）