Core Java with SCJP/ OCJP Notes By Durga Sir Collections 1 PDF

Advanced-java.pdf

4.11 Download the Source Code. • This was a lesson on How to design Classes and Interfaces. You may download the source code here: advanced-java-part-4. 4.12

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Why NAGOORBABU sir ADVANCE JAVA: › Covered Advance java topics in more depth Covering interview questions and answers in detail in the notes dictation.

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Core Java with SCJP/ OCJP Notes By Durga Sir Collections

1 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

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Core Java with SCJP/ OCJP Notes By Durga Sir Collections

2 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

Collections

Agenda

1. Introduction

2. Limitations of Object[] array

3. Differences between Arrays and Collections ?

4. 9(Nine) key interfaces of collection framework

i. Collection ii. List iii. Set iv. SortedSet v. NavigableSet vi. Queue vii. Map viii. SortedMap ix. NavigableMap

5. What is the difference between Collection and Collections ?

6. In collection framework the following are legacy characters

7. Collection interface

8. List interface

9. ArrayList

o Differences between ArrayList and Vector ? o Getting synchronized version of ArrayList object

LinkedList

Vector

Stack

The 3 cursors of java

0. Enumeration

1. Iterator

2. ListIterator

o Compression of Enumeration , Iterator and ListIterator ?

Set interface

HashSet

LinkedHashSet

Diff b/w HashSet & LinkedHashSet

SortedSet

TreeSet

o Null acceptance

Comparable interface

compareTo() method analysis

Comparator interface

Compression of Comparable and Comparator ?

Core Java with SCJP/ OCJP Notes By Durga Sir Collections

3 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

Compression of Set implemented class objects

Map

Entry interface

HashMap

o Differences between HashMap and Hashtable ? o How to get synchronized version of HashMap

LinkedHashMap

IdentityHashMap

WeakHashMap

SortedMap

TreeMap

Hashtable

Properties

1.5v enhancements

o Queue interface o PriorityQueue

1.6v Enhancements

o NavigableSet o NavigableMap

Utility classes :

o Collections class

Sorting the elements of a List

Searching the elements of a List

Conclusions

o Arrays class

Sorting the elements of array

Searching the elements of array

Converting array to List

Introduction:

1. An array is an indexed collection of fixed no of homogeneous data elements. (or)

2. An array represents a group of elements of same data type.

3. The main advantage of array is we can represent huge no of elements by using

single variable. So that readability of the code will be improved.

Limitations of Object[] array:

1. Arrays are fixed in size that is once we created an array there is no chance of

increasing (or) decreasing the size based on our requirement hence to use arrays concept compulsory we should know the size in advance which may not possible always.

2. Arrays can hold only homogeneous data elements.

Example:

Student[] s=new Student[10000];

s[0]=new Student();//valid

Core Java with SCJP/ OCJP Notes By Durga Sir Collections

4 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

s[1]=new Customer();//invalid(compile time error)

Compile time error:

Test.java:7: cannot find symbol

Symbol: class Customer

Location: class Test

s[1]=new Customer();

3) But we can resolve this problem by using object type array(Object[]).

Example:

Object[] o=new Object[10000];

o[0]=new Student(); o[1]=new Customer();

4) Arrays concept is not implemented based on some data structure hence ready-made

quotesdbs_dbs2.pdfusesText_2

[PDF] Core Java with SCJP/ OCJP Notes By Durga Sir Collections 1

1 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

2 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

Collections

Agenda

1. Introduction

2. Limitations of Object[] array

3. Differences between Arrays and Collections ?

4. 9(Nine) key interfaces of collection framework

5. What is the difference between Collection and Collections ?

6. In collection framework the following are legacy characters

7. Collection interface

8. List interface

9. ArrayList

LinkedList

Vector

The 3 cursors of java

0. Enumeration

1. Iterator

2. ListIterator

Set interface

HashSet

LinkedHashSet

Diff b/w HashSet & LinkedHashSet

SortedSet

TreeSet

Comparable interface

Comparator interface

Compression of Comparable and Comparator ?

3 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

Compression of Set implemented class objects

Entry interface

HashMap

LinkedHashMap

IdentityHashMap

WeakHashMap

SortedMap

TreeMap

Hashtable

Properties

1.5v enhancements

1.6v Enhancements

Utility classes :

Sorting the elements of a List

Searching the elements of a List

Conclusions

Sorting the elements of array

Searching the elements of array

Converting array to List

Introduction:

1. An array is an indexed collection of fixed no of homogeneous data elements. (or)

2. An array represents a group of elements of same data type.

3. The main advantage of array is we can represent huge no of elements by using

Limitations of Object[] array:

1. Arrays are fixed in size that is once we created an array there is no chance of

2. Arrays can hold only homogeneous data elements.

Example:

Student[] s=new Student[10000];

4 DURGASOFT, # 202,2ndFloor,HUDA Maitrivanam,Ameerpet, Hyderabad - 500038,

040 - 64 51 27 86, 80 96 96 96 96, 9246212143 | www.durgasoft.com

Compile time error:

Test.java:7: cannot find symbol

Symbol: class Customer

Location: class Test

3) But we can resolve this problem by using object type array(Object[]).

Example:

Object[] o=new Object[10000];

4) Arrays concept is not implemented based on some data structure hence ready-made