Assume We Have a RandomAccessFile Object, File, That Stores a Set

question 50

Multiple Choice

Assume we have a RandomAccessFile object, file, that stores a set of records of class MyData. The size of each record is MyData.RECORD_SIZE. Assume MyData has read and write methods both of which take a RandomAccessFile as an argument. Method write writes the object at the current location. Method read reads the record from current location of the file into the object. If we are currently at the beginning of the 1^st record, which code correctly modifies the 2^nd record by changing its color to Color.red through the setColor method?

• A) file.seek(MyData.RECORD_SIZE);
• MyData.read(file);
• MyData.setColor(Color.red);
• File.seek(MyData.RECORD_SIZE);
• MyData.write(file);
• B) myData.read(file);
• MyData.read(file);
• MyData.setColor(Color.red);
• MyData.write(file);
• C) myData.read(file);
• MyData.setColor(Color.red);
• File.seek(file.getFilePointer() + MyData.RECORD_SIZE);
• MyData.write(file);
• D) long loc = file.getFilePointer();
• MyData.read(file);
• MyData.setColor(Color.red);
• File.seek(loc);
• MyData.write(file);

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Definitions:

Decision Variable Values

The specific values assigned to decision variables, which are adjustable parameters in a mathematical model or optimization problem.

Objective Function

A mathematical function that represents the goal of an optimization problem, usually to be maximized or minimized.

Labor Hours

The total number of hours worked by all employees in a specific period, used as a measure of labor input.

Design Department

A division within a company responsible for developing the specifications and layouts of products or structures.