Match the following terms to their meanings:
I. Attribute A. Part of an opening tag that further defines a tag and includes a value
II. Pyramid B. DTD that does NOT allow deprecated elements
III. Search engine C. Web site's organizational design that allows different paths
IV. Strict D. Program that searches for keywords in a document
V. Notepad E. Program programmers use to create Web documents
A, C, D, B, E
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A string ________.
a) is only declared using the new keyword b) is immutable c) can dynamically resize d) is written as a series of characters surrounded by double quotation marks e) Both b and d.
Which of the following statements is false?
a. Thread synchronization is necessary only for shared mutable data, i.e., data that may change during its lifetime. b. With shared immutable data that will not change, it’s not possible for a thread to see old or incorrect values as a result of another thread’s manipulation of that data. c. When you share immutable data across threads, declare the corresponding data fields final to indicate that the values of the variables will not change after they’re initialized. This prevents accidental modification of the shared data, which could compromise thread safety. d. Labeling object references as final indicates that the referenced object is immutable.
Virtual memory is:
A. heap memory reserved for use by an object B. an area of the hard disk which is being used for a program in execution due to a lack of RAM C. that portion of RAM used by an object D. an area of RAM used for making copies of objects when objects are assigned or passed as parameters
Calculate the blocking factor bfr and the number of file blocks b assuming an unspanned organization.
Consider a disk with block size B=512 bytes. A block pointer is P=6 bytes long, and a record pointer is P R =7 bytes long. A file has r=30,000 EMPLOYEE records of fixed-length. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), DEPARTMENTCODE (9 bytes), ADDRESS (40 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), JOBCODE (4 bytes), SALARY (4 bytes, real number). An additional byte is used as a deletion marker.