当前分类： OCJP(310-065)
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...
查看答案
问题：单选题Given： What is the result？（）A testB ExceptionC Compilation fails.D NullPointerException...
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 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...
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：多选题Which two statements are true？（）AIt is possible for more than two threads to deadlock at once.BThe JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.CDeadlocked threads release once their sleep（） method’s sleep du...
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：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：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：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 t...
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：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：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：多选题Given： Which two methods， inserted independently at line 17， correctly complete the Sales class？（）Adouble getSalesAmount（） { return 1230.45； }Bpublic double getSalesAmount（） { return 1230.45； }Cprivate double getSalesAmount（） { return 1230.45； }Dprote...
问题：单选题Given： What is the result？（）A An Exception is thrown with no other outputB followed by an ExceptionC Compilation fails due to an error on line 9D Compilation fails due to an error on line 14...
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：单选题Given： What is the result？（）A TestAB TestBC Compilation fails.D An exception is thrown at runtime....
