Collections - Sorting, Comparing Basics

Aug 17, 2018Download as PPSX, PDF1 like121 views

In this core java training session, you will learn Collections – Sorting, Comparing. Topics covered in this session are: • Recap of Arrays, ArrayLists • Basically, there can be 2 operations that you would want to perform on Arrays/ArrayLists.. (and maybe, other collections) • Search: Override equals() and hashCode(). • Sort: provide comparison logic – Two ways • Comparable interface • Comparator interface For more information about this course visit on this link: https://www.mindsmapped.com/courses/software-development/learn-java-fundamentals-hands-on-training-on-core-java-concepts/

Core Java Training
Collections – Sorting, Comparing

Page 1Classification: Restricted
Agenda
• Recap of Arrays, ArrayLists
• Basically, there can be 2 operations that you would want to perform on
Arrays/ArrayLists.. (and maybe, other collections)
• Search: Override equals() and hashCode().
• Sort: provide comparison logic – Two ways
• Comparable interface
• Comparator interface

Page 2Classification: Restricted
Comparable vs Comparator Interfaces

$Page 3Classification: Restricted Comparable Interface Example public class Person implements Comparable { private int person_id; private String name; /** * Compare current person with specified person * return zero if person_id for both person is same * return negative if current person_id is less than specified one * return positive if specified person_id is greater than specified one */ @Override public int compareTo(Object o) { Person p = (Person) o; return this.person_id - o.person_id ; } …. }$

$Page 4Classification: Restricted Comparator Interface /** * Comparator implementation which sorts Person objects on person_id field */ public class SortByPerson_ID implements Comparator{ public int compare(Object o1, Object o2) { Person p1 = (Person) o; Person p2 = (Person) o; return p1.getPersonId() - p2.getPersonId(); } }$

Page 5Classification: Restricted
Comparing in Java – Strings and Dates
• Strings are immutable
• String implements Comparable interface
• Call String1.compareTo(String2)
• Date also implements Comparable.
• Date1.compareTo(Date2)

Page 6Classification: Restricted
Where is the Comparator or Comparable
interfaces used?

Page 7Classification: Restricted
Exercise…
1. Create an employee class with fields – id, name, age, salary.
2. Provide default comparison logic for id using java.lang.Comparable
interface.
3. Provide the following comparison logic using java.util.Comparator
interface
• Name
• Age
• Salary
• Name and then Age.
4. Test the above using
• Array of Employees and using Arrays.sort()
• ArrayList of Employees and using Collections.sort()

Page 8Classification: Restricted
Topics to be covered in next session
• List – ArrayList, LinkedList
• Set – HashSet, LinkedHashSet, TreeSet

Page 9Classification: Restricted
Thank You!

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Collections - Sorting, Comparing Basics

1. Core Java Training Collections – Sorting, Comparing

2. Page 1Classification: Restricted Agenda • Recap of Arrays, ArrayLists • Basically, there can be 2 operations that you would want to perform on Arrays/ArrayLists.. (and maybe, other collections) • Search: Override equals() and hashCode(). • Sort: provide comparison logic – Two ways • Comparable interface • Comparator interface

3. Page 2Classification: Restricted Comparable vs Comparator Interfaces

4. Page 3Classification: Restricted Comparable Interface Example public class Person implements Comparable { private int person_id; private String name; /** * Compare current person with specified person * return zero if person_id for both person is same * return negative if current person_id is less than specified one * return positive if specified person_id is greater than specified one */ @Override public int compareTo(Object o) { Person p = (Person) o; return this.person_id - o.person_id ; } …. }

5. Page 4Classification: Restricted Comparator Interface /** * Comparator implementation which sorts Person objects on person_id field */ public class SortByPerson_ID implements Comparator{ public int compare(Object o1, Object o2) { Person p1 = (Person) o; Person p2 = (Person) o; return p1.getPersonId() - p2.getPersonId(); } }

6. Page 5Classification: Restricted Comparing in Java – Strings and Dates • Strings are immutable • String implements Comparable interface • Call String1.compareTo(String2) • Date also implements Comparable. • Date1.compareTo(Date2)

7. Page 6Classification: Restricted Where is the Comparator or Comparable interfaces used?

8. Page 7Classification: Restricted Exercise… 1. Create an employee class with fields – id, name, age, salary. 2. Provide default comparison logic for id using java.lang.Comparable interface. 3. Provide the following comparison logic using java.util.Comparator interface • Name • Age • Salary • Name and then Age. 4. Test the above using • Array of Employees and using Arrays.sort() • ArrayList of Employees and using Collections.sort()

9. Page 8Classification: Restricted Topics to be covered in next session • List – ArrayList, LinkedList • Set – HashSet, LinkedHashSet, TreeSet

10. Page 9Classification: Restricted Thank You!

Collections - Sorting, Comparing Basics

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