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（）".
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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
A programmer iterates over the TreeSet and prints the name of each Drink object. What is the result？（）
A.Tea
B.Coffee
C.Coffee Tea
D.Compilation fails.
E.The code runs with no output.
F.An exception is thrown at runtime.
最新试题
What is the result？（）
What is the result？（）
Which statement is true？（）
Which three will compile and run without exception？（）
Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）
Which two of statements are true？（）
Which statement is true about the set variable on line 12？（）
Which three changes should be made to adapt this class to be used safely by multiple threads？（）
What is the result？（）
Which statement is true？（）