Difference between revisions of "Java/C2/Switch-Case/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
 
(3 intermediate revisions by 2 users not shown)
Line 14: Line 14:
 
|-
 
|-
 
|  00:11
 
|  00:11
−
|  For this tutorial, we are using  
+
|  For this tutorial, we are using '''Ubuntu v 11.10''', '''JDK 1.6''' and '''Eclipse 3.7.0'''
−
* '''Ubuntu v 11.10'''
+
−
* '''JDK 1.6''' and  
+
−
* '''Eclipse 3.7.0'''
+
  
 
|-
 
|-
Line 29: Line 26:
 
|-
 
|-
 
|  00:32
 
|  00:32
−
| A '''switch case''' is used to perform actions based on the value of a variable.
+
| '''switch case''': The '''switch case''' is used to perform actions based on the value of a variable.
  
 
|-
 
|-
 
|  00:39  
 
|  00:39  
−
| Here is the syntax for a '''switch case statement'''.  
+
| Here is the syntax for a '''switch case''' statement.  
  
 
|-
 
|-
Line 40: Line 37:
  
 
|-
 
|-
−
|   00:47
+
| 00:47
−
|   I already have '''Eclipse''' opened.
+
| I already have '''Eclipse''' opened.
  
 
|-
 
|-
Line 49: Line 46:
 
|-
 
|-
 
|  00:53
 
|  00:53
−
| Now Let us add some variables.
+
| Now, let us add some variables.
  
 
|-
 
|-
 
|  00:57
 
|  00:57
−
|  Inside the '''main method''', we will create a variable '''day''' of '''type''' '''int'''.
+
|  Inside the '''main method''', we will create a variable '''day''' of type '''int'''.
  
 
|-
 
|-
 
|  01:02
 
|  01:02
−
| So, type inside the '''main method''' '''int day''' and we can give it a value equal to '''3''' semi-colon.
+
| So, type inside the '''main method''' '''int day''' and we can give it a value equal to '''3''' semicolon.
  
 
|-
 
|-
Line 69: Line 66:
 
|-
 
|-
 
| 01:25
 
| 01:25
−
| Here, '''dName''' is a '''variable''' to hold the names of the days of a week.
+
| Here, '''dName''' is a '''variable''' to hold the name of the days of a week.
  
 
|-
 
|-
−
| 01:34
+
| 01:34
 
|  '''day''' stores the day number.
 
|  '''day''' stores the day number.
  
Line 93: Line 90:
 
|-
 
|-
 
|  02:01
 
|  02:01
−
| '''case 0''' colon  
+
| '''case 0''' colon.
  
 
|-
 
|-
Line 101: Line 98:
 
|-
 
|-
 
|  02:14
 
|  02:14
−
| Then type: Next line '''break'''  
+
| Then type: Next line '''break;'''  
  
 
|-
 
|-
Line 129: Line 126:
 
|-
 
|-
 
| 02:50
 
| 02:50
−
| Next line, '''dName''' equal to within double quotes '''Monday'''  semicolon  
+
| Next line, '''dName''' equal to within double quotes '''Monday'''  semicolon.
  
 
|-
 
|-
 
| 02:56
 
| 02:56
−
| Next line, type '''break'''
+
| Next line, type '''break;'''
  
 
|-
 
|-
 
| 02:58
 
| 02:58
−
|Then type: '''case 2''' colon  
+
|Then type: '''case 2''' colon.
  
 
|-
 
|-
 
| 03:01
 
| 03:01
−
|Next line, '''dName''' equal to ''' Tuesday''' then semicolon  
+
|Next line, '''dName''' equal to ''' Tuesday''' then semicolon.
  
 
|-
 
|-
 
| 03:06
 
| 03:06
−
| Next line, type '''break'''
+
| Next line, type '''break;'''
  
 
|-
 
|-
 
| 03:08
 
| 03:08
−
| Then next line, '''case 3''' colon  
+
| Then next line, '''case 3''' colon.
  
 
|-
 
|-
Line 157: Line 154:
 
|-
 
|-
 
| 03:18
 
| 03:18
−
|Next line, type '''break'''  
+
|Next line, type '''break;'''  
  
 
|-
 
|-
 
| 03:20
 
| 03:20
−
|  Then '''case 4''' colon  
+
|  Then '''case 4''' colon.
  
 
|-
 
|-
 
| 03:24
 
| 03:24
−
|Next line, '''dName''' equal to within double quotes '''Thursday''' then semicolon
+
|Next line, '''dName''' equal to within double quotes '''Thursday''' then semicolon.
  
 
|-
 
|-
Line 172: Line 169:
  
 
|-
 
|-
−
| 03:24
+
| 03:34
−
| Then next line, type: '''case 5''' colon  
+
| Then next line, type: '''case 5''' colon.
  
 
|-
 
|-
Line 184: Line 181:
 
|-
 
|-
 
| 03:43
 
| 03:43
−
|Then '''case 6''' colon  
+
|Then '''case 6''' colon.
  
 
|-
 
|-
 
| 03:47
 
| 03:47
−
|Next line, type: '''dName''' equal to within double quotes '''Saturday'''  then semicolon  
+
|Next line, type: '''dName''' equal to within double quotes '''Saturday'''  then semicolon.
  
 
|-
 
|-
Line 200: Line 197:
 
|-
 
|-
 
| 04:03
 
| 04:03
−
| Now Let us add a print statement and see the code in action.
+
| Now, let us add a print statement and see the code in action.
  
 
|-
 
|-
−
|   04:07
+
| 04:07
 
| So, next line, type: '''System ''' dot '''out''' dot '''println''' within brackets '''dName'''  then semicolon.  
 
| So, next line, type: '''System ''' dot '''out''' dot '''println''' within brackets '''dName'''  then semicolon.  
  
Line 220: Line 217:
 
|-
 
|-
 
|  04:31
 
|  04:31
−
| Now Let us change the value of the  day and see the result.
+
| Now, let us change the value of the  day and see the result.
  
 
|-
 
|-
Line 239: Line 236:
  
 
|-
 
|-
−
| 04 :52
+
| 04:52
 
| Change '''day''' equal to '''-1''' '''Save''' and '''run''' the file.
 
| Change '''day''' equal to '''-1''' '''Save''' and '''run''' the file.
  
Line 260: Line 257:
 
|-
 
|-
 
|  05:12
 
|  05:12
−
| '''default ''' colon  
+
| '''default ''' colon.
  
 
|-
 
|-
 
| 05:14  
 
| 05:14  
−
|Next line, '''dName''' equal to within double quotes '''Wrong Choice''' then semicolon  
+
|Next line, '''dName''' equal to within double quotes '''Wrong Choice''' then semicolon.
  
 
|-
 
|-
 
| 05:24  
 
| 05:24  
−
|Next line, '''break ''' semicolon  
+
|Next line, '''break ''' semicolon.
  
 
|-
 
|-
Line 312: Line 309:
 
|-
 
|-
 
|  06:12
 
|  06:12
−
|  Now '''Save''' and '''run'''.
+
|  Now '''Save''' and '''run''' the file.
  
 
|-
 
|-
Line 320: Line 317:
 
|-
 
|-
 
|  06:20
 
|  06:20
−
|   because of the way '''switch case''' works.  
+
| This is because of the way '''switch case''' works.  
  
 
|-
 
|-
 
|  06:24
 
|  06:24
−
| First the value of '''day''' is compared with 0.
+
| First, the value of '''day''' is compared with 0.
  
 
|-
 
|-
Line 348: Line 345:
 
|-
 
|-
 
| 06:57
 
| 06:57
−
|  | Let us now add the '''break''' statement we have removed.  
+
|Let us now add the '''break''' statement we have removed.  
  
 
|-
 
|-
Line 372: Line 369:
 
|-
 
|-
 
|  07:22
 
|  07:22
−
| In this tutorial, we have learnt how to use '''switch case construct''' and how to use '''break statement.'''
+
| In this tutorial, we have learnt how to use '''switch case construct''' and how to use '''break''' statement.
  
 
|-
 
|-
Line 383: Line 380:
 
|-
 
|-
 
|  07:53
 
|  07:53
−
| If you do not have good bandwidth,   you can download and watch it.
+
| If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
 
|  07:58
 
|  07:58
−
|  The Spoken Tutorial Project Team. Conducts workshops using spoken tutorials and gives certificates for those who pass an online test.  
+
|  The Spoken Tutorial Project team: Conducts workshops using spoken tutorials and gives certificates to those who pass an online test.  
  
 
|-
 
|-
Line 406: Line 403:
 
|-
 
|-
 
|  08:31
 
|  08:31
−
|  | This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
+
|  This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
  
 
|}
 
|}

Latest revision as of 15:07, 28 March 2017

Time Narration
00:02 Welcome to the spoken tutorial on Switch Case in Java.
00:06 In this tutorial, you will learn how to use the switch case construct in Java.
00:11 For this tutorial, we are using Ubuntu v 11.10, JDK 1.6 and Eclipse 3.7.0
00:21 For this tutorial, you should have knowledge of if else statement in Java.
00:25 If not, please go through the tutorials on these topics available at our website which is as shown [1]
00:32 switch case: The switch case is used to perform actions based on the value of a variable.
00:39 Here is the syntax for a switch case statement.
00:44 Let us use it now.
00:47 I already have Eclipse opened.
00:49 I have created a class named SwitchCaseDemo.
00:53 Now, let us add some variables.
00:57 Inside the main method, we will create a variable day of type int.
01:02 So, type inside the main method int day and we can give it a value equal to 3 semicolon.
01:12 Now, let us create a variable dName of type String.
01:18 String dName we can initialize it to null.
01:25 Here, dName is a variable to hold the name of the days of a week.
01:34 day stores the day number.
01:36 Now, we will type the switch case statement. So, next line, type:
01:43 switch within brackets day then open curly brackets Press Enter.
01:52 This statement defines which variable is under consideration for the cases.
01:59 Next line, type:
02:01 case 0 colon.
02:04 Next line, dName equal to within double quotes Sunday semicolon.
02:14 Then type: Next line break;
02:17 This statement says that if the day is 0 then dName must be set to Sunday.
02:26 Note that a break statement must be used at the end of each case.
02:31 without the break statement, the switch-case functions in a complex fashion.
02:35 It will be explained in subsequent part of the tutorial.
02:40 Similarly, let us type the remaining cases.
02:45 Next line, type: case 1 colon.
02:50 Next line, dName equal to within double quotes Monday semicolon.
02:56 Next line, type break;
02:58 Then type: case 2 colon.
03:01 Next line, dName equal to Tuesday then semicolon.
03:06 Next line, type break;
03:08 Then next line, case 3 colon.
03:12 Next line, type: dName equal to within double quotes Wednesday then semicolon
03:18 Next line, type break;
03:20 Then case 4 colon.
03:24 Next line, dName equal to within double quotes Thursday then semicolon.
03:32 Then break .
03:34 Then next line, type: case 5 colon.
03:37 dName equal to within double quotes Friday then semicolon.
03:41 Then break.
03:43 Then case 6 colon.
03:47 Next line, type: dName equal to within double quotes Saturday then semicolon.
03:55 Then type: break semicolon.
03:59 Then close the brackets.
04:03 Now, let us add a print statement and see the code in action.
04:07 So, next line, type: System dot out dot println within brackets dName then semicolon.
04:16 Now Save and run the file.
04:20 Now press Ctrl S and Ctrl F11 keys.
04:25 We get the output as: Wednesday which is corresponding to the case 3.
04:31 Now, let us change the value of the day and see the result.
04:35 So change 3 to 0.
04:38 Now Save and Run that file.
04:40 As we can see, the output is Sunday corresponding to the case 0.
04:46 Now, what if there is no case corresponding to the value. So, let us see that.
04:52 Change day equal to -1 Save and run the file.
04:58 As we can see, there is no output.
05:01 But it would be better if we could have a case for all other values.
05:06 That is done by using the default keyword.
05:09 So, after the last case, type:
05:12 default colon.
05:14 Next line, dName equal to within double quotes Wrong Choice then semicolon.
05:24 Next line, break semicolon.
05:27 We do not say case default;
05:30 Note that we simply use the keyword default.
05:34 Now, let us run the code. So save and run the file.
05:38 As we can see, the default case is executed and the required message Wrong choice is printed.
05:45 Let us try with another random value.
05:48 Change -1 to 15.
05:51 As we can see, again the default case is executed.
05:57 Now, let us see what happens if we remove the break statement.
06:01 So, Let us change day = 15 to day = 4,
06:07 remove the corresponding break statement for day =4.
06:12 Now Save and run the file.
06:15 Although the case is 4, we get the output as Friday and not Thursday.
06:20 This is because of the way switch case works.
06:24 First, the value of day is compared with 0.
06:29 Then with 1, then with 2 and so on with all the possible cases.
06:34 When a match is found, it executes all the case from the match onwards.
06:42 In our case, it executed case 5 after case 4.
06:47 Then it stops because of the break statement in case 5.
06:53 To avoid that, we need to add a break statement in each case.
06:57 Let us now add the break statement we have removed.
07:00 So, type: break semicolon.
07:05 Now let us run the code.
07:08 As we can see, now only case 4 is executed.
07:13 As a rule, remember to use a break statement in every case, to avoid errors.
07:20 We have come to the end of this tutorial.
07:22 In this tutorial, we have learnt how to use switch case construct and how to use break statement.
07:30 As an assignment, write a program that has a name and gender as a variable. Use a switch case statement that prints “Hello Mr....” for males and “Hello Ms...” for females.
07:44 To know more about the Spoken Tutorial project, watch the video available at the following link, it summarizes the spoken-tutorial project.
07:53 If you do not have good bandwidth, you can download and watch it.
07:58 The Spoken Tutorial Project team: Conducts workshops using spoken tutorials and gives certificates to those who pass an online test.
08:06 For more details, please write to contact AT spoken HYPHEN tutorial DOT org.
08:12 Spoken Tutorial Project is a part of the Talk to a Teacher project and it is supported by the
08:17 National Mission on Education through ICT, MHRD, Government of India.
08:22 More information on this mission is available at spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro.
08:31 This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Sandhya.np14, Sneha

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Java/C2/Switch-Case/English-timed&oldid=34513"