多項選擇題

public class Key {
private long id1；
private long 1d2；
// class Key methods
}
A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）

A. public int hashCode（）
B. public boolean equals（Key k）
C. public int compareTo（Object o）
D. public boolean equals（Object o）
E. public boolean compareTo（Key k）

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單項選擇題

public class Person {
private String name， comment；
private int age；
public Person（String n， int a， String c） {
name = n； age = a； comment = c；
}
public boolean equals（Object o） {
if（! （o instanceof Person）） return false；
Person p = （Person）o；
return age == p.age && name.equals（p.name）；
}
}
What is the appropriate definition of the hashCode method in class Person？（）

A. return super.hashCode（）；
B. return name.hashCode（） + age * 7；
C. return name.hashCode（） + comment.hashCode（） /2；
D. return name.hashCode（） + comment.hashCode（） / 2 - age * 3；

單項選擇題

A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add（0，object）， but does NOT need to support quick random access. What supports these requirements？（）

A. java.util.Queue
B. java.util.ArrayList
C. java.util.LinearList
D. java.util.LinkedList

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public class Key { private long id1； private long 1d2； // class Key methods } A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）

你可能感興趣的試題

A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add（0，object）， but does NOT need to support quick random access. What supports these requirements？（）

public class Key {
private long id1；
private long 1d2；
// class Key methods
}
A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）

A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add（0，object）， but does NOT need to support quick random access. What supports these requirements？（）