Java/C2/Array-Operations/English-timed

Time	Narration
00:02	Welcome to the spoken tutorial on Array Operations in java.
00:07	In this tutorial, you will learn how to
00:09	import the class Arrays and,
00:12	perform basic operations on arrays.
00:15	For this tutorial we are using Ubuntu 11.10, JDK 1.6 and Eclipse 3.7.0
00:25	For this tutorial, you should have knowledge on arrays in Java.
00:30	If not, for relevant tutorial please visit our website which is as shown http://spoken-tutorial.org
00:35	The methods for array operations are available in a class called Arrays.
00:40	To access them, we need to import that class.
00:43	It is done by the statement import java.util.Arrays semicolon
00:50	We can access a method from the class.
00:52	We do it by adding a dot and the method name.
00:56	So Arrays dot toString means toString method from the Arrays class.
01:05	Now Switch to eclipse.
01:08	We have already created a class ArraysDemo.
01:13	Let us now import the class Arrays.
01:16	The import statement is written before the class definition.
01:22	So Before public class, type
01:26	import java.util.Arrays semicolon
01:46	This statement says that java contains a package called util which contains the class Arrays and it has to be imported.
01:59	Now let us add an array.
02:01	Inside the main function,type
02:03	int marks open and close square brackets equal to within brackets 2, 7, 5, 4, 8
02:20	Now we shall use a method available in the Arrays class to get a string representation of the array and print it.
02:28	SoType String mStr equal to Arrays dot toString Paranthesis inside Paranthesis will give the array name i.emarks
02:50	Now this toString method will give the string representation of the array.
02:56	we shall print the marks.
02:58	So, type System dot out dot println 'inside Paranthesis type mStr
03:12	Now let us look at the output so save and run the program
03:18	As we can see in the output, the toString method has given a string representation of the array.
03:26	Now let us look at sorting the elements of the array.
03:31	So before the line Arrays dot toString type Arrays dot sort within parenthesis the Array name i.e marks
03:46	So the sort method in the Arrays class, sorts the elements of the array passed to it.
03:53	Now we are sorting the element of the array marks and then printing the string form of it.
04:04	Let us look at the output.So save and run
04:11	As we can see in the output the sort method has sorted to the array in the ascending order
04:19	Note that the sort method has changed the array itself.
04:22	This type of sorting is called inplace sorting.
04:26	It means that the array which contains the elements is changed as a result of sorting.
04:33	The next method we are going to look at, is fill
04:38	The fill method takes two arguments.
04:43	Remove the sorting line and
04:50	Type Arrays dot fill within brackets the name of the arrays i.e marks;
05:05	This is our first argument and second is the value that should be filled in the array we will give it 6 and semicolon. Save and Run
05:24	As we can see, as the name goes, the fill method fills the array with the given argument i.e 6
05:32	The next method we are going to look at, is copyOf
05:37	We are going to copy all the elements of the array marks into the array marksCopy
05:44	So remove arrays dot fill
05:48	And Type int marksCopy [];
05:59	next line, Type marksCopy = arrays. copyOf(marks, 5);
06:25	This method takes two arguments.
06:29	The first argument is the name of the array from which you want to copy the elements.i.e marks
06:39	the second is the no.of elements to copy overhere we will copy 5.
06:47	Then in arrays dot tostring change marks to marks copy
06:55	Now save and run the program
07:01	We see that the elements of the array marks have been copied to the array marksCopy.
07:10	Let us see what happens if we change the no.of elements to be copied.
07:15	Let'sChange 5 to 3.
07:19	Save and Run
07:24	As we can see, only the first three elements have been copied.
07:31	Let us see what happens if the no.of elements to be copied is greater than the total no.of elements in the array.
07:39	So Change 3 to 8
07:44	Save and Run the program
07:48	As we can see, the extra elements have been set to the default value, which is 0.
07:54	Next we'll see how to copy a range of values.
07:58	So Change copyOf to copyOfRange and 8 to 1, 4
08:15	This methods copies all the elements starting from the index 1 and stopping at index 3.
08:27	Save and Run
08:31	As we can see, the elements from index 1 to 3 have been copied.
08:39	Note that we have given 1, 4 as our arguments
08:47	But even, then the element at index 4 has not been copied.
08:50	Only the elements till index 3 have been copied. It stops one index before the given range
09:01	So This behaviour ensures that continuity of ranges is maintained.
09:07	(0, 4) implies from index 0 to index 3
09:12	(4, 6) will implies index from 4 to 5
09:17	So it behaves as if (0, 4) + (4, 6) = (0, 5)
09:26	This brings us o the end of this tutorial.
09:31	In this tutorial we have learnt
09:33	how to import the class Arrays.
09:36	Perform array operations like to strings,sort, copy, fill.
09:44	For assignment
09:46	Read about the Arrays.equals method and find out what it does.
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10:39	This tutorial has been contributed by TalentSprint. Thanks for joining.
10:43	This is Prathmesh Salunke Signing off. Jai Hind.

Contributors and Content Editors

Gaurav, Krupali, PoojaMoolya, Sandhya.np14, Sneha