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:

Market Equilibrium

The point where the supply of goods matches demand, resulting in a stable price.

Excess Demand

A market situation where the quantity demanded of a good exceeds the quantity supplied at a current price, leading to shortages.

Excess Supply

A situation in a market where the quantity of a good supplied is greater than the quantity demanded at the current price.

Excess Demand

A market condition in which the quantity demanded of a good or service exceeds the quantity supplied at a given price, leading to upward pressure on price.