【计算机类职业资格】计算机Java认证-异常处理、使用类及其关系及答案解析.doc

1、计算机 Java认证-异常处理、使用类及其关系及答案解析(总分：12.00，做题时间：90 分钟)一、B不定项选择题/B(总题数：1，分数：12.00)Use the following code example for the next four questions:public class Client Address address;AccountNum accountNums;void setAddress(Address newAddress) address = newAddress;public Client() accountNums = new AccountNum2;acc

2、ountNums0 = new AccountNum();accountNums1 = new AccountNum();（分数：12.00）(1).In the preceding code segment, what is the relationship of the Client object and the address variable? A. Direct association B. Temporary association C. Composition association D. Aggregation association（分数：2.40）A.B.C.D.(2).I

3、n the preceding code segment, what is the relationship of the Client object and the accountNums variable? A. Direct association B. Temporary association C. Composition association D. Aggregation association（分数：2.40）A.B.C.D.(3).In the preceding code segment, what is the multiplicity between the Clien

4、t object and the address variable? A. One-to-one B. One-to-many C. Many-to-many（分数：2.40）A.B.C.D.(4).In the preceding code segment, what is the multiplicity between the Client object and the accountNums variable? A. One-to-one B. One-to-many C. Many-to-many（分数：2.40）A.B.C.D.(5).Which of the following

5、statements are true? (Choose all that apply.) A. Association navigation can be quad-directional. B. Association navigation can be bidirectional. C. Association navigation can have no direction. D. Association navigation can be unidirectional.（分数：2.40）A.B.C.D.计算机 Java认证-异常处理、使用类及其关系答案解析(总分：12.00，做题时间

6、：90 分钟)一、B不定项选择题/B(总题数：1，分数：12.00)Use the following code example for the next four questions:public class Client Address address;AccountNum accountNums;void setAddress(Address newAddress) address = newAddress;public Client() accountNums = new AccountNum2;accountNums0 = new AccountNum();accountNums1

7、= new AccountNum();（分数：12.00）(1).In the preceding code segment, what is the relationship of the Client object and the address variable? A. Direct association B. Temporary association C. Composition association D. Aggregation association（分数：2.40）A. B.C.D.解析：直接关联是最佳答案，因为从逻辑上来说，一个 Client对象有一个(“has an”)

8、Address 对象。B、C 和 D不正确。(2).In the preceding code segment, what is the relationship of the Client object and the accountNums variable? A. Direct association B. Temporary association C. Composition association D. Aggregation association（分数：2.40）A.B.C. D.解析：这是一个组合关联，因为 Client对象由 AccountNum对象“组成”。这是一种强关系

9、，因为Client对象维护 AccountNumber对象的生命周期。A、B 和 D不正确。(3).In the preceding code segment, what is the multiplicity between the Client object and the address variable? A. One-to-one B. One-to-many C. Many-to-many（分数：2.40）A. B.C.D.解析：因为没有数组或者集合涉及 Client对象或者 Address对象中的一个，这必须是一对一关系。B 和C不正确。B 不正确，因为 address变量是单个

10、变量，因此不满足多个。C 不正确，因为 Client对象和address变量两者都不能认为是多个，因为它们都只有一个。(4).In the preceding code segment, what is the multiplicity between the Client object and the accountNums variable? A. One-to-one B. One-to-many C. Many-to-many（分数：2.40）A.B. C.D.解析：AccountNumber 对象数组应该是一对多的产物。A 和 C不正确。A 不正确，因为 accountNums变量是

11、一个数组，因此必须是多个。C 不正确，因为只有一个 Client对象。(5).Which of the following statements are true? (Choose all that apply.) A. Association navigation can be quad-directional. B. Association navigation can be bidirectional. C. Association navigation can have no direction. D. Association navigation can be unidirectional.（分数：2.40）A.B. C.D. 解析：关系只能是单向的或者双向的。A 和 C不正确。A 不正确，因为不存在 4个方向的关系。B 不正确，因为不可能有一种关系没有方向。