Cracking the Coding Interview, 4 Edition - 150 Programming Interview Questions and Solutions

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Solutions to Chapter 18 | Threads and Locks 2 Semaphore s_b(0); 3 Semaphore s_c(1); 4 A { 5 s_c.acquire(1); 6 /***/ 7 s_a.release(1); 8 } 9 B { 10 s_a.acquire(1); 11 /****/ 12 s_b.release(1); 13 } 14 C { 15 s_b.acquire(1); 16 /******/ 17 s_c.release(1); 18 } 2 6 3 Cracking the Coding Interview | Knowledge Based
Solutions to Chapter 18 | Threads and Locks 18.6 You are given a class with synchronized method A, and a normal method C. If you have two threads in one instance of a program, can they call A at the same time? Can they call A and C at the same time? SOLUTION pg 86 Java provides two ways to achieve synchronization: synchronized method and synchronized statement. Synchronized method: Methods of a class which need to be synchronized are declared with “synchronized” keyword. If one thread is executing a synchronized method, all other threads which want to execute any of the synchronized methods on the same objects get blocked. Syntax: method1 and method2 need to be synchronized 1 public class SynchronizedMethod { 2 // Variables declaration 3 public synchronized returntype Method1() { 4 // Statements 5 } 6 public synchronized returntype method2() { 7 // Statements 8 } 9 // Other methods 10 } Synchronized statement: It provides the synchronization for a group of statements rather than a method as a whole. It needs to provide the object on which these synchronized statements will be applied, unlike in a synchronized method. Syntax: synchronized statements on “this” object 1 synchronized(this) { 2 /* statement 1 3 * ... 4 * statement N */ 5 } i) If you have two threads in one instance of a program, can they call A at the same time? Not possible; read the above paragraph. ii) Can they call A and C at the same time? Yes. Only methods of the same object which are declared with the keyword synchronized can’t be interleaved. CareerCup.com 2 6 4
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CRACKING THE FOURTH EDITION C O D I
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Table of Contents Chapter 7 | Objec
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Introduction Something’s Wrong We
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Behind the Scenes For many candidat
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Behind the Scenes | The Amazon Inte
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Behind the Scenes | The Apple Inter
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Interview War Stories The View from
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Interview War Stories | Pop Divas P
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Interview War Stories | You Can (Ma
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Interview War Stories | Spider Sens
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Before the Interview | Resume Advic
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Before the Interview | Behavioral P
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Before the Interview | Technical Pr
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The Interview and Beyond
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At the Interview | Handling Behavio
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At the Interview | Handling Technic
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At the Interview | Five Algorithm A
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At the Interview | Five Algorithm A
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At the Interview | The Offer and Be
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At the Interview | Top Ten Mistakes
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At the Interview | Frequently Asked
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Interview Questions
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Chapter 1 | Arrays and Strings Hash
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Chapter 2 | Linked Lists How to App
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Chapter 3 | Stacks and Queues How t
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Chapter 4 | Trees and Graphs How to
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Part 2 Concepts and Algorithms
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Chapter 5 | Bit Manipulation 5.1 Yo
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Chapter 6 | Brain Teasers 6.1 Add a
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Chapter 7 | Object Oriented Design
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Chapter 8 | Recursion 8.1 Write a m
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Chapter 9 | Sorting and Searching 9
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Chapter 10 | Mathematical 10.1 You
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Chapter 11 | Testing 11.1 Find the
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Chapter 12 | System Design and Memo
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Chapter 13 | C++ How To Approach: A
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Chapter 14 | Java How to Approach:
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Chapter 15 | Databases How to Appro
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Chapter 16 | Low Level How to Appro
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Chapter 17 | Networking How to Appr
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Chapter 18 | Threads and Locks How
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Part 4 Additional Review Problems
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Chapter 19 | Moderate _____________
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Chapter 20 | Hard Input: DAMP, LIKE
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Solutions
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Solutions to Chapter 1 | Arrays and
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Solutions to Chapter 2 | Linked Lis
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Solutions to Chapter 3 | Stacks and
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Solutions to Chapter 4 | Trees and
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Solutions to Chapter 5 | Bit Manipu
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Solutions to Chapter 6 | Brain Teas
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Solutions to Chapter 7 | Object Ori
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Solutions to Chapter 9 | Sorting an
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Solutions to Chapter 12 | Testing 1
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Page 291 and 292: Index A arithmetic 108, 131, 143, 1
Page 293: Mock Interviews Mock Interviews Stu
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