当前分类： OCJP(310-065)
问题：多选题Given： class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and： ClassA p0 = new ClassA（）； ClassB p1 = new ClassB（）； ClassC p2 = new ClassC（）； ClassA p3 = new ClassB（）； ClassA p4 = new ClassC（）； Which three are valid？（）Ap0 = p1...
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问题：单选题Click the Exhibit button. What is the result？（）A Compilation of class A fails.B Line 28 prints the value 3 to System.out.C Line 28 prints the value 1 to System.out.D A runtime error occurs when line 25 executes.E Compilation fails because of an e...
问题：多选题Given that c is a reference to a valid java.io.Console object，which two code fragments read a line of textfrom the console？（）AString s = c.readLine（）；Bchar[] c = c.readLine（）；CString s = c.readConsole（）；Dchar[] c = c.readConsole（）；EString s = c.readLin...
问题：单选题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？（）A put Poker.jar in directory /stuff/...
问题：单选题Given： What is the result？（）A 5，6B 5，5C 6，5D 6，6...
问题：单选题Given： Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）A Alpha a = x；B Foo f = （Delta）x；C Foo f = （Alpha）x；D Beta b = （Beta）（Alpha）x；...
问题：单选题Given： What is the result？（）A r， t， t，B r， e， o，C Compilation fails.D An exception is thrown at runtime....
问题：多选题Which three will compile and run without exception？（）Aprivate synchronized Object o；Bvoid go（） {synchronized（） { /* code here */ }Cpublic synchronized void go（） { /* code here */ }Dprivate synchronized（this） void go（） { /* code here */ }Evoid go（） {syn...
问题：单选题Which can appropriately be thrown by a programmer using Java SE technology to create a desktop application？（）A ClassCastExceptionB NullPointerExceptionC NoClassDefFoundErrorD NumberFormatExceptionE ArrayIndexOutOfBoundsException...
问题：单选题Given： What is the result？（）A test endB Compilation fails.C test runtime endD test exception endE A Throwable is thrown by main at runtime....
问题：单选题Given： What is the result？（）A 1B 12C 14D 123...
问题：单选题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.QueueB java.util.ArrayListC java....
问题：多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object？（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInput...
问题：多选题Which two statements are true about the hashCode method？（）AThe hashCode method for a given class can be used to test for object equality and object inequality for that class.BThe hashCode method is used by the java.util.SortedSet collection class to or...
问题：单选题Given： 11.String test = "a1b2c3"； 12.String[] tokens = test.split（"//d"）； 13.for（String s： tokens） System.out.print（s + " "）； What is the result？（）A a b cB 1 2 3C a1b2c3D a1 b2 c3...
问题：多选题Given： Which three are true？（）ACat is-a AnimalBCat is-a JumperCDog is-a AnimalDDog is-a JumperECat has-a AnimalFBeagle has-a Tail...
问题：多选题Given： And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH environment variable is set to "." （current directory）. Which two java commands entered at the commandline will run MainClass？（）Ajava MainClass if run fro...
问题：多选题Click the Exhibit button. What two must the programmer do to correct the compilation errors？（）Ainsert a call to this（） in the Car constructorBinsert a call to this（） in the MeGo constructorCinsert a call to super（） in the MeGo constructorDinsert a cal...
问题：多选题Given： Which two， placed on line 13， will produce the output gobstopper？（）ASystem.load（"prop.custom"）；BSystem.getenv（"prop.custom"）；CSystem.property（"prop.custom"）；DSystem.getProperty（"prop.custom"）；ESystem.getProperties（）.getProperty（"prop.custom"）；...
