Given：
What is the result？（）
A.An Exception is thrown with no other output
B.B, followed by an Exception.
C.Compilation fails due to an error on line 9.
D.Compilation fails due to an error on line 15.
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Given：
What is the result？（）
A.Compilation fails.
B.aAaA aAa AAaa AaA
C.AAaa AaA aAa aAaA
D.AaA AAaa aAaA aAa
E.aAa AaA aAaA AAaa
Given：
What is the result？（）
A.Compilation fails.
B.An exception is thrown at runtime.
C.[608， 610， 612， 629] [608， 610]
D.[608， 610， 612， 629] [608， 610， 629]
E.[606， 608， 610， 612， 629] [608， 610]
A.The class implements java.lang.Comparable.
B.The class implements java.util.Comparator.
C.The interface used to implement sorting allows this class to define only one sort sequence.
D.The interface used to implement sorting allows this class to define many different sort sequences.
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
Given：
Which two code fragments， inserted independently at line 5， will compile without warnings？（）
A.public void addStrings(List list) {
B.public void addStrings(List<String> list) {
C.public void addStrings(List<? super String> list) {
D.public void addStrings(List<? extends String> list) { B,C
Given：
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）
Given：
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；
Click the Exhibit button.
Which statement is true about the set variable on line 12？（）
A.The set variable contains all six elements from the coll collection， and the order is guaranteed to be preserved.
B.The set variable contains only three elements from the coll collection， and the order is guaranteed to be preserved.
C.The set variable contains all six elements from the coll collection， but the order is NOT guaranteed to be preserved.
D.The set variable contains only three elements from the coll collection， but the order is NOT guaranteed to be preserved.
Click the Exhibit button.
What two must the programmer do to correct the compilation errors？（）
A.insert a call to this（） in the Car constructor
B.insert a call to this（） in the MeGo constructor
C.insert a call to super（） in the MeGo constructor
D.insert a call to super（vin） in the MeGo constructor
E.change the wheelCount variable in Car to protected
Given：
What is the result？（）
A.Compilation fails.
B.Cannot add Toppings
C.The code runs with no output.
D.A NullPointerException is thrown in Line 4.
最新试题
Given：What is the result？（）
Click the Exhibit button.What two must the programmer do to correct the compilation errors？（）
Given：What are four valid examples of polymorphic method calls？（）
Given：What is the result？（）
Given：What is the result？（）
Given a method that must ensure that its parameter is not null：What， inserted at line 12， is the appropriate way to handle a null value？（）
Given：When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）
A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command：java games.cards.Poker What allows the user to do this？（）
Given：Which command-line invocations will compile？（）
Given：What is the result？（）