Given the following code fragment：     public void create（） {     Vector myVect；     myVect = new Vector（）；      }  Which of the following statements are true？（） 

A . df = new DateFormat(); B . df = Date.getFormat(); C . df = date.getFormat(); D . df = DateFormat.getFormat(); E . df = DateFormat.getInstance()

A . public&ensp；class&ensp；MinMax<；？>；&ensp；{ B . public&ensp；class&ensp；MinMax<；？extends&ensp；Number>；&ensp；{ C . public&ensp；class&ensp；MinMax<；Nextends&ensp；Object>；&ensp；{ D . public&ensp；class&ensp；MinMax<；Nextends&ensp；Number>；&ensp；{ E . public&ensp；class&ensp；MinMax<；？extends&ensp；Object>；&ensp；{ F . public&ensp；class&ensp；MinMax<；Nextends&ensp；Integer>；&ensp；{

A . public class MinMax<?> { B . public class MinMax<? extends Number> { C . public class MinMax<N extends Object> { D . public class MinMax<N extends Number> { E . public class MinMax<? extends Object> { F . public class MinMax<N extends Integer> {

A . The instance gets garbage collected. B . The code on line 33 throws an exception. C . The code on line 35 throws an exception. D . The code on line 31 throws an exception. E . The code on line 33 executes successfully.

A . FileOutputStream has no constructors matching the given arguments. B . An IOExeception will be thrown if a file named "data" already exists. C . An IOExeception will be thrown if a file named "data" does not already exist. D . If a file named "data" exists， its contents will be reset and overwritten. E . If a file named "data" exists， output will be appended to its current contents.

A . df = new DateFormat（）； B . df = Date.getFormat（）； C . df = date.getFormat（）； D . df = DateFormat.getFormat（）； E . df = DateFormat.getInstance（）；

A .  The code will run a backup validation to populate the V$BACKUP_CORRUPTION view and repair corrupt blocks， if any， recorded in the view. B .  The code will run a backup validate to populate the V$COPY_CORRUPTION view and then repair any corrupt blocks recorded in the view. C .  The code will runs a backup validate to populate the V$DATABASE_BLOCK_CORRUPTION view and then repair corrupt blocks， if any， recorded in the view. D .  The code will run a backup validate to populate the RC_BACKUP_CORRUPTION view and then repair corrupt blocks， if any， recorded in the view.

A . It aims to ensure safety at sea B . It aims to avoid damage to the environment C . It aims to prevent human injury or loss of life D . It aims to provide a method to run a company

A . a++； B . b++； C . c++； D . d++； E . e++；

A .  When compilation some error will occur. B .  It is correct when compilation but will cause error when running. C .  The output is zero. D .  The output is null.

A .  When compilation some error will occur. B .  It is correct when compilation but will cause error when running. C .  The output is zero. D .  The output is null.

A . A. Welcome <% out.print（login.getName（））； %>  B .  Welcome <% writer.print（login.getName（））； %>  C .  Welcome <% response.out.print（login.getName（））； %> D .  Welcome <% response.writer.print（login.getName（））； %>  E .  Welcome <% response.getOutputStream（）.write（login.getName（））； %>%>

A . It produces an error because a fully qualified host name needs to be specified. B . It produces an error because the range of ports associated with the hosts has not been specified. C . It creates an access control list (ACL) with the user ACCT_MGR who gets the CONNECT and RESOLVE privileges. D . It creates an access control list (ACL) with the user ACCT_MGR who gets the CONNECT privilege but not the RESOLVE privilege.

A .  x > 0 B .  x > -3 C .  x <= -3 D .  x <= 0 & x > -3

A .  The attribute foo is placed in the application B .  A ServletContextListener registered for that servlet is notified C .  A ServletAttributeListener registered for that servlet is notified D .  An HttpSessionAttributeListener registered for that servlet is notified

A . p.setWeight（420）； B . p.changePayload（420）； C . p = new Payload（420）； D . Payload.setWeight（420）； E . p = Payload.setWeight（420）；

A . One object is created B . Two objects are created C . Three objects are created D . One reference variable is created E . Two reference variables are created F . Three reference variables are created.

A．on line 2 B．on line 3 C．on line 6 D．on line 7

<img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/047d6bd4894fe3060c1d5c6a923e9029.jpg' /> A. It is true that j==i. B. It is false that j==i. C. An exception is thrown at runtime. D. Compilation fails because of an error in line 13.

A．a value-returning method B．a void method C．a local variable D．a complex method