单选题What produces a compiler error？（）A class A { public A（int x） {} }B class A {} class B extends A { B（） {} }C class A { A（） {} } class B { public B（） {} }D class Z { public Z（int） {} } class A extends Z {}
单选题
What produces a compiler error？（）
A
class A { public A（int x） {} }
B
class A {} class B extends A { B（） {} }
C
class A { A（） {} } class B { public B（） {} }
D
class Z { public Z（int） {} } class A extends Z {}
参考解析
解析：
暂无解析
相关考题：
●The error messages given by a C compiler show the message text,the most common cause of the error,and a suggestion for (73) the error.(73) A．upfsyingB．fixingC．changingD．Editing
The error messages given by a C compiler show the message text，the most common(68) of the error，and a suggestion for fixing the error．A．consequenceB．causeC．informationD．result
What is the outcome of this block of code?() A. It creates a task and workload, and executes the task.B. It creates a task and workload but does not execute the task.C. It produces an error because a template has not been created.D. It produces an error because the SQL Tuning Set has not been created.
Evaluate the following SQL statement used to create the PRODUCTS table:Which statement is true regarding this command?() A. It executes successfully but partition pruning cannot happen for this partition key.B. It produces an error because the TOTAL_VALUE column cannot be used as a partition key.C. It produces an error because compression cannot be used for the TOTAL_VALUE partition key.D. It executes successfully but the values in the TOTAL_VALUE column would not be physically stored in the partitions.
Evaluate the following block of code:What is the outcome of the above code?() 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.
Evaluate the SQL statement:What is the result of the statement?() A. The statement produces an error at line 1.B. The statement produces an error at line 3.C. The statement produces an error at line 6.D. The statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all departments that pay less salary then the maximum salary paid in the company.E. The statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
What operation on relations R and S produces the relation shown below?A．UnionB．DifferenceC．IntersectionD．Division
What is the MD5 algorithm used for？（）A、takes a fixed-length message and produces a 128-bit message digestB、takes a variable-length message and produces a 168-bit message digestC、takes a message less than 2^64 bits as input and produces a 160-bit message digestD、takes a variable-length message and produces a 128-bit message digest ActualTests.com
What does ECC stand for?（）A、Error-Checking CodeB、Extended-Checking CodeC、Error-Correction CodeD、Enhanced-Correction Code
What is the default message level configured for IBM Tivoli Federated Identity Manager?（）A、error messages onlyB、disable all messagesC、error and warning messages onlyD、info, error and warning messages
What produces a compiler error？（） A、 class A { public A（int x） {} }B、 class A {} class B extends A { B（） {} }C、 class A { A（） {} } class B { public B（） {} }D、 class Z { public Z（int） {} } class A extends Z {}
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.
In your database server， the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve？（）A、It degrades the run time and compiler performance.B、It provides better run time and compiler performance.C、It provides better optimization of the statement during parse time.D、It forces the rule based optimizer to be used for statement optimization.E、It provides better run time performance but slightly degraded compiler performance.F、It provides better run time performance but slightly degraded run time performance.
Sales details are being stored on a daily basis in the SALES_2007 table. A large amount of data is added to the table daily. To save disk space, you issued the following command: ALTER TABLE sales_2007 COMPRESS FOR ALL OPERATIONS; What would be the outcome of this command?（）A、It produces an error because data already exists in the table.B、It produces an error because compression can be enabled at table creation only.C、It compresses all data added or modified henceforth but the existing data in the table is not compressed immediately.D、It immediately compresses all existing data as well as new data, resulting from either fresh additions or modifications to existing data.
You are planning the migration of an existing application to Windows Azure. The application includes a trace listener that produces log files. The log files must be transferred to the Windows Azure Storage service each day with the minimum amount of effort. You need to recommend an approach for transferring the log files. What should you recommend？（）A、 Perform on-demand transfers of custom error logs.B、 Perform on-demand transfers of Windows Azure logs.C、 Configure scheduled transfers of custom error logs.D、 Configure scheduled transfers of Windows event logs.
单选题The INV_HISTORY table is created using the command: You would like to store the data belonging to the year 2006 in a single partition and issue the command: What would be the outcome of this command? （）A It executes successfully, and the transition point is set to '1-apr-2006'.B It executes successfully, and the transition point is set to '15-apr-2006'.C It produces an error because the partitions specified for merging are not adjacent.D It produces an error because the date values specified in the merge do not match the date values stored in the table.
单选题Examine the commands executed in the following sequence： 1：SQL CREATE ROLE mgrrole； 2：SQL GRANT create user，select any table，connect，resource TO mgrrole； 3：SQL GRANT select，update ON sh.sales TO mgrrole； 4：SQL CREATE ROLE ceo IDENTIFIED BY boss； 5：SQL GRANT mgrrole，drop any table，create any directory TO ceo； 6：SQL GRANT ceo TO mgrrole； Which statement is true about the above commands（）AThe commands execute successfully.BCommand 6 produces an error because of circular role grant.CCommand 5 produces an error because a role cannot be granted to another role.DCommand 3 produces an error because the MGRROLE role already contains system privileges.EThe table created by HR remains and HR still has the CREATE TABLE system privilege.FThe table created by HR remains and HR can grant the CREATE TABLE system privilege to other users.
单选题Evaluate the SQL statement: 1 SELECT a.emp_name, a.sal, a.dept_id, b.maxsal 2 FROM employees a, 3 (SELECT dept_id, MAX(sal) maxsal 4. FROM employees 5 GROUP BY dept_id) b 6 WHERE a.dept_id = b.dept_id 7 AND a. asl b. maxsal; What is the result of the statement?（）AThe statement produces an error at line 1.BThe statement produces an error at line 3.CThe statement produces an error at line 6.DThe statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all departments that pay less salary then the maximum salary paid in the company.EThe statement returns the employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
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？（）AIf the compile is successful， Utils.class is added to the source directory.BThe compiler returns an invalid flag error.CIf the compile is successful， Utils.class is added to the classes directory.DIf the compile is successful， Utils.class is added to the bigProject directory.
单选题Sales details are being stored on a daily basis in the SALES_2007 table. A large amount of data is added to the table daily. To save disk space, you issued the following command: ALTER TABLE sales_2007 COMPRESS FOR ALL OPERATIONS; What would be the outcome of this command?（）AIt produces an error because data already exists in the table.BIt produces an error because compression can be enabled at table creation only.CIt compresses all data added or modified henceforth but the existing data in the table is not compressed immediately.DIt immediately compresses all existing data as well as new data, resulting from either fresh additions or modifications to existing data.
单选题What is the implication of this command?（）AThe command produces an error because the retention time cannot be reduced. BAll historical data is retained but the subsequent flashback data archives are maintained for only three years. CAll historical data is purged and the new flashback data archives are maintained for three years. DAll historical data older than three years is purged from the flashback archive FLA1.
单选题Evaluate the following block of code： BEGIN DBMS_NETWORK_ACL_ADMIN.CREATE_ACL （ acl = ’mycompany-com-permissions.xml’， principal = ’ACCT_MGR’， is_grant = TRUE， privilege = ’connect’）； DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL （ acl = ’mycompany-com-permissions.xml’， host = ’*.mycompany.com’）； END； What is the outcome of the above code？（）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.
单选题Evaluate the following code： SQLVARIABLE task_name VARCHAR2（255）； SQLVARIABLE sql_stmt VARCHAR2（4000）； SQLBEGIN ：sql_stmt ：= ’SELECT COUNT（*） FROM customers WHERE cust_state_province =’’CA’’’； ：task_name ：= ’MY_QUICKTUNE_TASK’； DBMS_ADVISOR.QUICK_TUNE（DBMS_ADVISOR.SQLACCESS_ADVISOR， ：task_name， ：sql_stmt）； END； What is the outcome of this block of code？（）A It creates a task and workload， and executes the task.B It creates a task and workload but does not execute the task.C It produces an error because a template has not been created.D It produces an error because the SQL Tuning Set has not been created.
单选题You are planning the migration of an existing application to Windows Azure. The application includes a trace listener that produces log files. The log files must be transferred to the Windows Azure Storage service each day with the minimum amount of effort. You need to recommend an approach for transferring the log files. What should you recommend？（）A Perform on-demand transfers of custom error logs.B Perform on-demand transfers of Windows Azure logs.C Configure scheduled transfers of custom error logs.D Configure scheduled transfers of Windows event logs.
填空题What kind of sound does the mouse produce?It produces ____ sounds.