你可能感興趣的試題

Which two statements are true about the hashCode method？（）

A. The hashCode method for a given class can be used to test for object equality and object inequality for that class.
B. The hashCode method is used by the java.util.SortedSet collection class to order theelements within that set.
C. The hashCode method for a given class can be used to test for object inequality， but NOT object equality， for that class.
D. The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution.
E. The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.

單項(xiàng)選擇題

1. public class Person {
2. private String name；
3. public Person（String name） { this.name = name； }
4. public boolean equals（Person p） {
5. return p.name.equals（this.name）；
6. }
7. }
Which is true？（）

A. The equals method does NOT properly override the Object.equals method.
B. Compilation fails because the private attribute p.name cannot be accessed in line 5.
C. To work correctly with hash-based data structures， this class must also implement the hashCode method.
D. When adding Person objects to a java.util.Set collection， the equals method in line 4 will prevent duplicates.

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你可能感興趣的試題

Which two statements are true about the hashCode method？（）

1. public class Person { 2. private String name； 3. public Person（String name） { this.name = name； } 4. public boolean equals（Person p） { 5. return p.name.equals（this.name）； 6. } 7. } Which is true？（）

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Which two statements are true about the hashCode method？（）

1. public class Person {
2. private String name；
3. public Person（String name） { this.name = name； }
4. public boolean equals（Person p） {
5. return p.name.equals（this.name）；
6. }
7. }
Which is true？（）