问题：单选题Given： String[] elements = { "for"， "tea"， "too" }； String first = （elements.length > 0） ？ elements[0] ： null； What is the result？（）A Compilation fails.B An exception is thrown at runtime.C The variable first is set to null.D The variable first is set to elements[0].
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问题：单选题Given a method that must ensure that its parameter is not null： 11. public void someMethod（Object value） { 12. // check for null value ... 20. System.out.println（value.getClass（））； 21. } What inserted at line 12， is the appropriate way to handle a null value？（）A assert value == null；B assert value != null， value is null；C if （value == null） { throw new AssertionException（value is null）； }D if （value == null） { throw new IllegalArgumentException（value is null）； }
问题：单选题Given the following directory structure： bigProject |--source ||--Utils.java| |--classes |-- And the following command line invocation： javac -d classes source/Utils.java Assume the current directory is bigProject，what is the result？（）A If the compile is successful， Utils.class is added to the source directory.B The compiler returns an invalid flag error.C If the compile is successful， Utils.class is added to the classes directory.D If the compile is successful， Utils.class is added to the bigProject directory.
问题：多选题Given： 35.String #name = "Jane Doe"； 36.int $age = 24； 37.Double _height = 123.5； 38.double ~temp = 37.5； Which two statements are true？（）ALine 35 will not compile.BLine 36 will not compile.CLine 37 will not compile.DLine 38 will not compile.
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 from the /apps directoryBjava com.company.application.MainClass if run from the /apps directoryCjava -classpath /apps com.company.application.MainClass if run from any directoryDjava -classpath . MainClass if run from the /apps/com/company/application directoryEjava -classpath /apps/com/company/application：. MainClass if run from the /apps directory
问题：单选题Given： What is the result？（）Ab 3Bb 8Cb 13Df 3
问题：单选题Given： 12.Date date = new Date（）； 13.df.setLocale（Locale.ITALY）； 14.String s = df.format（date）； The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14， 2000？（）A The value of s is 14-dic-2000.B The value of s is Dec 14， 2000.C An exception is thrown at runtime.D Compilation fails because of an error in line 13.
问题：单选题Given： 1.package test； 2. 3.class Target { 4.public String name = "hello"；5.} What can directly access and change the value of the variable name？（）A any classB only the Target classC any class in the test packageD any class that extends Target
问题：单选题Given： What is the result？（）AAn Exception is thrown with no other outputBfollowed by an ExceptionCCompilation fails due to an error on line 9DCompilation fails due to an error on line 14
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 StringBufferInputStream.DWhen you plan to reuse the StringBuffer to build more than one string.
问题：多选题A developer is creating a class Book， that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three， taken independently， will allow the developer to use the Paper class while compiling the Bookclass？（）AThe JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.BThe JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..CThe JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.DThe JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.EThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - cp /foo/myLib.jar/Paper Book.java.FThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - classpath /foo/myLib.jar Book.java
问题：单选题Given that the elements of a PriorityQueue are ordered according to natural ordering，and： What is the result？（）Aapple pearBbanana pearCapple appleDapple bananaEbanana banana
问题：单选题Given a valid DateFormat object named df，and 16.Date d = new Date（0L）； 17.String ds = "December 15， 2004"； 18.//insert code here What updates d’s value with the date represented by ds？（）A 18. d = df.parse（ds）；B 18. d = df.getDate（ds）；C 18. try {19. d = df.parse（ds）；20. } catch（ParseException e） { }；D 18. try {19. d = df.getDate（ds）；20. } catch（ParseException e） { }；
问题：多选题Given a class whose instances， when found in a collection of objects， are sorted by using the compare To method， which two statements are true？（）AThe class implements java.lang.Comparable.BThe class implements java.util.Comparator.CThe interface used to implement sorting allows this class to define only one sort sequence.DThe interface used to implement sorting allows this class to define many different sort sequences.
问题：单选题Given： What is the result？（）ACompilation succeeds.BCompilation fails due to multiple errors.CCompilation fails due to an error only on line 20.DCompilation fails due to an error only on line 21.ECompilation fails due to an error only on line 22.
问题：单选题Given： 11.String test = "This is a test"； 12.String[] tokens = test.split（"/s"）； 13.System.out.println（tokens.length）； What is the result？（）A 0B 1C 4D Compilation fails.
问题：单选题Given: What is the result？（）A[1， 2， 3， 5]B[2， 1， 3， 5]C[2， 5， 3， 1]D[5， 3， 2， 1]E[1， 3， 5， 2]
问题：单选题Given： Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection？（）ALine 16BLine 17CLine 18DLine 19
