单项选择题
public class Person {
private name；
public Person（String name） {
this.name = name；
}
public int hashCode（） {
return 420；
}
}
Which is true？（）
A. The time to find the value from HashMap with a Person key depends on the size of the map.
B. Deleting a Person key from a HashMap will delete all map entries for all keys of typePerson.
C. Inserting a second Person object into a HashSet will cause the first Person object to beremoved as a duplicate.
D. The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.
相关考题
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单项选择题
WhichManclassproperlyrepresentstherelationship“ManhasabestfriendwhoisaDog”？（）
A. class Man extends Dog { }
B. class Man implements Dog { }
C. class Man { private BestFriend dog； }
D. class Man { private Dog bestFriend； }
E. class Man { private Dog}
F. class Man { private BestFriend} -
多项选择题
Assume that country is set for each class. Given： 10. public class Money { 11. private String country， name； 12. public getCountry（） { return country； } 13.} and： 24. class Yen extends Money { 25. public String getCountry（） { return super.country； } 26. } 27. 28. class Euro extends Money { 29. public String getCountry（String timeZone） { 30. return super.getCountry（）； 31. } 32. } Which two are correct？（）
A. Yen returns correct values.
B. Euro returns correct values.
C. An exception is thrown at runtime.
D. Yen and Euro both return correct values.
E. Compilation fails because of an error at line 25.
F. Compilation fails because of an error at line 30. -
单项选择题
public class CreditCard { private String cardlD； private Integer limit； public String ownerName； public void setCardlnformation（String cardlD， String ownerName， 28. Integer limit） { this.cardlD = cardlD； this.ownerName = ownerName； this.limit = limit； } } Which is true？（）
A. The class is fully encapsulated.
B. The code demonstrates polymorphism.
C. The ownerName variable breaks encapsulation.
D. The cardlD and limit variables break polymorphism.
E. The setCardlnformation method breaks encapsulation.
