Java/C2/Switch-Case/English-timed

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.
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08:31	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Sandhya.np14, Sneha