多項(xiàng)選擇題

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.

你可能感興趣的試題

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.

單項(xiàng)選擇題

public class Person {
private name；
public Person（String name） {
this.name = name；
}
public boolean equals（Object o） {
if（ !o instanceof Person ） return false；
Person p = （Person） o；
return p.name.equals（this.name）；
}
}
Which is true？（）

A. Compilation fails because the hashCode method is not overridden.
B. A HashSet could contain multiple Person objects with the same name.
C. All Person objects will have the same hash code because the hashCode method is not overridden.
D. If a HashSet contains more than one Person object with name=”Fred”， then removing another person， also with name=”Fred”， will remove them all.

日韩欧美亚洲 _ 欧美亚洲一区 _ 日本亚洲欧美 _ 亚洲精品欧美 国产白袜脚足J棉袜在线观看_亚洲熟妇av一区二区三区_久久天天躁狠狠躁夜_精品众筹模特私拍在线

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

你可能感興趣的試題

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？（）

public class Person { private name； public Person（String name） { this.name = name； } public boolean equals（Object o） { if（ !o instanceof Person ） return false； Person p = （Person） o； return p.name.equals（this.name）； } } Which is true？（）

日韩欧美亚洲 _ 欧美亚洲一区 _ 日本亚洲欧美 _ 亚洲精品欧美国产白袜脚足J棉袜在线观看_亚洲熟妇av一区二区三区_久久天天躁狠狠躁夜_精品众筹模特私拍在线

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？（）

public class Person {
private name；
public Person（String name） {
this.name = name；
}
public boolean equals（Object o） {
if（ !o instanceof Person ） return false；
Person p = （Person） o；
return p.name.equals（this.name）；
}
}
Which is true？（）