Cracking the Coding Interview - Fooo

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Solutions to Chapter 14 | Java 14 4 Explain the difference between templates in C++ and generics in Java SOLUTION C++ Templates Java Generics Classes and functions can be templated Classes and methods can be genericized Parameters can be any type or integral value Separate copies of the class or function are likely to be generated for each type parameter when compiled Objects of a class with different type parameters are different types at run time Implementation source code of the templated class or function must be included in order to use it (declaration insufficient) Templates can be specialized - a separate implementation could be provided for a particular template parameter Does not support wildcards Instead, return types are often available as nested typedefs Does not directly support bounding of type parameters, but metaprogramming provides this Allows instantiation of class of type parameter type Type parameter of templated class can be used for static methods and variables Static variables are not shared between classes of different type parameters CareerCup com pg 78 Parameters can only be reference types (not primitive types) One version of the class or function is compiled, works for all type parameters Type parameters are erased when compiled; objects of a class with different type parameters are the same type at run time Signature of the class or function from a compiled class file is sufficient to use it Generics cannot be specialized Supports wildcard as type parameter if it is only used once Supports bounding of type parameters with "extends" and "super" for upper and lower bounds, respectively; allows enforcement of relationships between type parameters Does not allow instantiation of class of type parameter type Type parameter of templated class cannot be used for static methods and variables Static variables are shared between instances of a classes of different type parameters From http://en.wikipedia.org/wiki/Comparison_of_Java_and_C%2B%2B#Templates_vs._Generics 2 2 8
Solutions to Chapter 14 | Java 14 5 Explain what object reflection is in Java and why it is useful SOLUTION 2 2 9 Cracking the Coding Interview | Knowledge Based pg 78 Object Reflection is a feature in Java which provides a way to get reflective information about Java classes and objects, such as: 1 Getting information about methods and fields present inside the class at run time 2 Creating a new instance of a class 3 Getting and setting the object fields directly by getting field reference, regardless of what the access modifier is 1 import java.lang.reflect.*; 2 3 public class Sample { 4 public static void main(String args[]) { 5 try { 6 Class c = Class.forName(“java.sql.Connection”); 7 Method m[] = c.getDeclaredMethods(); 8 for (int i = 0; i < 3; i++) { 9 System.out.println(m[i].toString()); 10 } 11 } catch (Throwable e) { 12 System.err.println(e); 13 } 14 } 15 } This code’s output is the names of the first 3 methods inside the “java sql Connection” class (with fully qualified parameters) Why it is useful: 1 Helps in observing or manipulating the runtime behavior of applications 2 Useful while debugging and testing applications, as it allows direct access to methods, constructors, fields, etc
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CRACKING THE C O D I N G I N T E R
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CRACKING THE C O D I N G I N T E R
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Table of Contents Foreword 4 Introd
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Dear Readers, CareerCup com Forewor
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My Approach Introduction The focus
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Behind the Scenes | The Microsoft I
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Behind the Scenes | The Google Inte
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Behind the Scenes | The Yahoo Inter
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Interview War Stories the next few
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Interview War Stories | Failure to
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Interview War Stories | You Can (Ma
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Before the Interview
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Before the Interview | Resume Advic
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Before the Interview | Behavioral P
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What You Need To Know Before the In
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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 | Handling Technic
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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 How This Book i
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Part 1 Data Structures
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Chapter 1 | Arrays and Strings 1 1
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2 1 Write code to remove duplicates
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Chapter 3 | Stacks and Queues 3 1 D
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Chapter 4 | Trees and Graphs 4 1 Im
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Chapter 5 | Bit Manipulation How to
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Chapter 6 | Brain Teasers Do compan
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Chapter 7 | Object Oriented Design
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Chapter 8 | Recursion How to Recogn
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Chapter 9 | Sorting and Searching H
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Chapter 10 | Mathematical How to Ap
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Chapter 11 | Testing Testing Proble
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Chapter 12 | System Design and Memo
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Part 3 Knowledge Based
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Chapter 13 | C++ 13 1 Write a metho
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Chapter 14 | Java 14 1 In terms of
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Chapter 15 | Databases 15 1 Write a
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Chapter 16 | Low Level 16 1 Explain
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Chapter 17 | Networking 17 1 Explai
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Chapter 18 | Threads and Locks 18 1
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Chapter 19 | Moderate 19 1 Write a
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Chapter 20 | Hard 20 1 Write a func
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Each problem may have many 'optimal
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Solutions to Chapter 1 | Arrays and
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Solutions to Chapter 2 | Linked Lis
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Approach 2: Solutions to Chapter 3
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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 6 | Brain Teas
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Solutions to Chapter 7 | Object Ori
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Page 237 and 238: Solutions to Chapter 15 | Databases
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Solutions to Chapter 20 | Hard 20 1
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Solutions to Chapter 20 | Hard 17 }
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M matrixes 101, 102, 163, 169, 184,
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About the Author Gayle Laakmann’s
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