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

question 6

Multiple Choice

Assume we have a RandomAccessFile object, file, which 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 25^th record, which code correctly modifies the 25^th record by changing its color to Color.yellow through the setColor method?

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

---

Definitions:

Average Profit

The mean amount of profit earned, calculated by dividing the total profit by the number of units sold or the period over which the profit was earned.

Weight Gain

An increase in body weight, which can be due to muscle mass increase, fat accumulation, or other factors.

Probability Distribution

A mathematical description of the likelihood of different outcomes in an experiment, showing how probabilities are distributed over a range of values.

Variance

A statistical measure that represents the average squared deviation from the mean, indicating how spread out a data set is.