public abstract class Plant { } public abstract void breathe (); Consider the class shown above. Which of the following class definitions will NOT compile? public class Flower extends Plant { public void water() { System.out.println("Fresh water"); } } public class Flower extends Plant { public void breathe () { System.out.println("Fresh air"); } } public abstract class Flower extends Plant { public abstract void water(); }

public abstract class Plant { } public abstract void breathe (); Consider the class shown above. Which of the following class definitions will NOT compile? public class Flower extends Plant { public void water() { System.out.println("Fresh water"); } } public class Flower extends Plant { public void breathe () { System.out.println("Fresh air"); } } public abstract class Flower extends Plant { public abstract void water(); }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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The specification for a typical disk storage system is shown in Table P18.1. An employee file consisting of 100,000 records is stored on the disk. The employee record structure and the size of the fields in bytes (shown in brackets) are given below: Employee Employee number name (6) (20) Designation Address (10) (30) Basic pay (6) Number of platters Number of cylinders Allowances Deductions (20) Number of tracks (surfaces)/cylinder Number of sectors/track Number of bytes/sector Maximum seek time Average seek time Maximum Latency time Average latency time Time to read/write a sector 6 800 10 50 512 50 ms 25 ms 16.66 ms 8.33 ms 0.33 ms (20) Total salary (6) a) What is the storage space (in terms of bytes) needed to store the employee file in the disk? b) What is the storage space (in terms of cylinders) needed to store the employee file in the disk?
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