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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