Bài tập trắc nghiệm JAVA

1/ Main component of ODBC a. Web application, DriverManager, ListDrivers, SQLServer b. Application, DriverManager, Driver, Access c. Application, DriverManager, Driver, Target-database middle ware d. Application, DriverManager, Disk, Target-database middle ware 2/ Choose the correct answers about DriverManager of ODBC a. Loads driver on a as – needed basic for application b. Maps a target database name to a specific driver c. Processes several ODBC … 3/ Choose the correct answers about Driver of ODBC a. Processes the ODBC function calls b. Modifies them to the target database format c. Submits the SQL statement to the target database, receives the results and presents the results to the application d. All of above are correct 22/ For the system consisting of exclusively Java object, which distributed technology would be most approriate for communication? a. CORBA b. JavaBeans c. RMI d. JNDI 23/ The RMI compiler rmic runs on which of the following files to produoce the stub and skeleton classes? a. On the remote interface class file b. On the remote interface Java file c. On the remote service implementation class file d. On the remote service implementation java file 24/ Which distributed object technology is most approriate for systems that consist entirely of java object? a. RMI b. CORBA c. DCE d. DCOM 25/ Which distributed object technology is most appropriate for systems that consist of objects written in different languages and that execute on different operating system platforms? a. RMI b. CORBA c. DCE d. DCOM 26/ Which of the following is not a tier of three- tier architecture? a/ Client interface b/ Data storage c/ Business logic d/ Security 27/ Which of the following is not true about RMI? a/ RMI uses the Proxy design pattern b/ The RMI client can communicate with the server without knowing the server’s physical location. c/ RMI use obj serialization to send obj between JVMS. d/ The RMI Registry is used to generate stubs and skeletons. 28/ which of the following is NOT true a java bean ? a/ All of its properties x have a “getx()” mehotd, where x is any property name. b/ It use the AWT event delegation model. c/ It is stored in a “.bean” file. d/ It has a constructor funtion which has no arguments. 29/ RMI URLs start with_____and are followed by server, an optional port number, another slash, and the name of the remote object. a/http:// b/ ftp:// c/smtp:// d/ rmi:// 30/ The RMISecurityManager________all code in the program from establishing netword connections a/ Restricts b/ Gets c/ Receives d/ Accesses 31/ RMI uses the ___mechanism to send objects across a network connection a/ Non-serialization b/ Serialization c/ Comparation d/ Non-comparation 32/ The _____mechanism lets you delay the object construction so that a server objects is only constructed when at least one client invokes a remote method on it. a/ Deactivation b/ Start c/ Activation d/ Stop 33/ The java.rmi.activation.Activatable has exportObject method. The prototype of this method is : a/ Remote exportObject(remote obj,activationID id, int port) b/ Remote Object exportObject(remote obj, activationID id, int port) c/ Static Remote export Object (remote obj, activationID id, int port) d/ Static Remote Object export Object (remote obj, activationID id, int port) 34/ The RMI compiler rmic runs on which of the following files produce the stub and skeleton classes? a/ On the remote interface class file. b/ On the remote interface java file. c/ On the remote service implement action class file. d/ On the remote service implement action java file. 35/ Choose the correct statement(s) a/ A remote object is an object on anotherr computer b/ The client object is the object making the response (receiving a message to the other obj). c/ The server obj is the obj sending the response. d/ All are correct. 36/ Choose the correct statement(s) a/ The rmiregistry is a special server that looks up object by name, the rmiregistry using http protocol. b/ rmic is a special complier for creating stub and skeleton. c/ All incorrect. d/ All correct. 37/ Choose the correct statement(s) a/ the client program should use a more conservative security manager than the default. we use System.setSecurityManager(new RMISecurity.Manager()); b/ the client program should use a more conservative security manager than the default. we use class.setSecurityManager(new RMISecurity.Manager()); c/ the client program should use a more conservative security manager than the default. we use System.setRMISecurityManager(new RMISecurity.Manager()); d/ The client program should use a more conservative security manager tha the default. We use System.setRMISecurityManager(new Security.Manager()); 38/ Choose the correct statement(s) a/ Remote object are passed across the netword as stubs. Non-remote object are copied. b/ Remote object are passed the netword as skeletons. Non-remote object are copied. c/ Parameter passing in the remote methods is automatically and requires no programmer intervention. d/ Parameter passing in the remote methods is not automatically. 39/ Choose the correct statement(s) a/ The activation mechanism lets you delay the object constrution, so that a server object is only constructed when at least one client invokes a remote method on it. B/ The activation mechanism lets you delay the object invocation, so that a server object is only invoked when at least one client connects a remote method on it. c/ All incorrect. d/ All correct. 40/ For RMI, you need to be running ________ processes. a/ Three: the client, the server, the object registry b/ Two: the client, the server c/ Four: client, the server,rmiregistry,activation server d/ Five: client, the server, rmiregistry,activation server and sockket server 41/ See the following statements imoirt java.rmi.*; public interface HelloInterface extends Remote { public String say(); } Choose the correct statement(s): a/ The code defines an interface for remote obj application b/ The code defines an implementation class for remote obj application. c/ It’s not correct because of defining of method. d/ It’s correct, no problem for the implementation class. Notes: Thuộc tính Bean: - Simple: get/set, khai báo private - index: get/set cho mảng và cho từng thành phần - bound: implements PropertyChangeListener - constraint: implements VetoableChangeListener (old/new value) Khảo sát bên trong 1 Bean: (method, event, properties) - Dùng interface: BeanInfo - Dùng PropertyDescriptor (“Tên thuộc tính”, TenlopBean) - Exception trong quá trình khảo sát IntrospectionException - EventSetDescriptor dap an tạo Thread ->implements Runnable/run() extends Thread trạng thái của Thread (state) New -> Runnable // start() <-> Blocked -> Dead ->Dead Cau 22 A B C D 23 C 24 A 25 B 26 D 27 D 28 C 29 D 30 A 31 B 32 C 33 34 C 35 A C 36 B 37 38 A C 39 A 40 A 41 A C 42 . correct 22/ For the system consisting of exclusively Java object, which distributed technology would be most approriate for communication? a. CORBA b. JavaBeans c. RMI d. JNDI 23/ The RMI compiler. interface class file b. On the remote interface Java file c. On the remote service implementation class file d. On the remote service implementation java file 24/ Which distributed object technology. interface class file. b/ On the remote interface java file. c/ On the remote service implement action class file. d/ On the remote service implement action java file. 35/ Choose the correct statement(s)