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
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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.
A team of programmers is involved in reviewing a proposed design for a new utility class. After some discussion， they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself.
What design issue has the team discovered？（）
A.Tight coupling
B.Low cohesion
C.High cohesion
D.Loose coupling
E.Weak encapsulation
F.Strong encapsulation
最新试题
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？（）
Click the Exhibit buttonWhich two statements are true if a NullPointerException is thrown on line 3 of class C？（）
Given：What is the result？（）
A team of programmers is involved in reviewing a proposed design for a new utility class. After some discussion， they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself.What design issue has the team discovered？（）
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？（）
Given：When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）
Given a correctly compiled class whose source code is：Assume that the class file is located in /foo/com/sun/sjcp/， the current directory is /foo/， and that theclasspath contains "." （current directory）.Which command line correctly runs Commander？（）
Given：Which two code fragments， inserted independently at line 5， will compile without warnings？（）
Given：What is the result？（）
Given：What is the appropriate definition of the hashCode method in class Person？（）