What is the output if the main() method is run?()
A.4
B.5
C.8
D.9
E.Compilation fails.
F.An exception is thrown at runhime.
G.It is impossible to determine for certain.
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Which statement is true?()
A.This code can throw an InterruptedException.
B.This code can throw an IllegalMonitorStateException.
C.This code can throw a TimeoutException after ten minutes.
D.Reversing the order of obj.wait() and obj.notify() might cause this method to complete normally.
E.A call to notify() or notifyAll() from another thread might cause this method to complete normally.
F.This code does NOT compile unless "obj.wait()" is replaced with "((Thread) obj).wait()".
Which two can be results?()
A.java.lang.RuntimeException: Problem
B.run.java.lang.RuntimeException: Problem
C.End of method.java.lang.RuntimeException: Problem
D.End of method.run.java.lang.RuntimeException: Problem
E.run.java.lang.RuntimeException: Problem.End of method.
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
F.An exception is thrown at runtime.
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]
F.[606, 608, 610, 612, 629] [608, 610, 629]
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 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 void hashCode()
C.public int compareTo(Object o)
D.public boolean equals(Object o)
E.public boolean compareTo(Key k)
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;
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.
Which code, inserted at line 4, guarantees that this program will output [1, 2]?()
A.Set set = new TreeSet();
B.Set set = new HashSet();
C.Set set = new SortedSet();
D.List set = new SortedList();
E.Set set = new LinkedHashSet();
A programmer must create a generic class MinMax and the type parameter of MinMax must implement Comparable. Which implementation of MinMax will compile?()
A.A
B.B
C.C
D.D
最新试题
Which code, inserted at line 4, guarantees that this program will output [1, 2]?()
Which statement is true?()
Given that t1 is a reference to a live thread, which is true?()
Which statement is true about the set variable on line 12?()
Which statement is true?()
Which two of statements are true?()
Given: foo and bar are public references available to many other threads, foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait(). From another thread, what provides the most reliable way to ensure that foo will stop executing wait()?()
Which statement is true?()
What is the result?()
Which two are possible results?()