Difference between revisions of "Java/C2/Strings/English-timed"
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Revision as of 12:52, 9 July 2014
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Strings in Java. |
| 00:05 | In this tutorial, you will learn how to |
| 00:08 | create strings, add strings and 'perform basic string operations like converting to lower case and upper case. |
| 00:18 | For this tutorial we are using
Ubuntu 11.10, JDK 1.6 and Eclipse 3.7' |
| 00:26 | To follow this tutorial you must have knowledge of data types in Java.
|
| 00:32 | If not, for relevant tutorial please visit our website as shown |
| 00:40 | String in Java, is a sequence of characters.
|
| 00:44 | Before starting with Strings, we will first see the character data type.
|
| 00:50 | Let us now switch to eclipse |
| 00:55 | we have the eclipse IDE and the skeleton required for the rest of the code.
|
| 01:00 | We have created a class StringDemo and added the main method. |
| 01:07 | Inside the main method, type char star equal to in single quotes asrteicks |
| 01:19 | This statement creates a variable with name star and of the type char.
|
| 01:25 | It can store exactly one character.
|
| 01:28 | Let us print a word using a few characters. |
| 01:33 | Remove the char line and type , |
| 01:36 | char c1 equal to in single quotes c |
| 01:43 | char c2 equal to in single quotes a |
| 01:49 | char c3 equal to in single quotes r |
| 01:55 | We have created three characters to make the word car.
|
| 01:59 | Now let us use them to print the word. |
| 02:02 | type,
|
| 02:04 | System.out.print(c1); |
| 02:12 | System.out.print(c2); |
| 02:22 | System.out.print(c3);
|
| 02:31 | Please note that I’m using print instead of println so that all the characters are printed on the same line.
|
| 02:39 | save the file and run it.
|
| 02:43 | As we can see, the output is as expected.
|
| 02:46 | But this method only prints the word but does not create one.
|
| 02:50 | To create a word, we use the String data type.
|
| 02:54 | Let us try it out. |
| 02:57 | remove everything inside the main method and type
|
| 03:03 | String greet equal to Hello Learner :
|
| 03:16 | Note that S in the word String is in uppercase.
|
| 03:19 | And we are using double quotes instead of single quotes as delimiters |
| 03:25 | This statement creates a variable greet that is of the type String
|
| 03:31 | Now Let us print the message. |
| 03:33 | System.out.println(greet); |
| 03:44 | Save the file and run it |
| 03:51 | As we can see, the message has been stored in the variable and it has been printed.
|
| 03:57 | Strings can also be added in Java.
|
| 04:00 | let us see how to do so. |
| 04:04 | I'm removing the Learner from the message. |
| 04:08 | We'll store the name in a different variable. |
| 04:14 | String name equal to “Java”;
|
| 04:22 | Now we’ll add the strings to make a message
|
| 04:28 | String msg equal to greet plus name ;
|
| 04:42 | change the greet println(greet) in the print statement to message println(msg) save the file and run it.
|
| 04:56 | We can see that the output shows the greeting and the name. |
| 05:00 | But there is no space separating them. |
| 05:02 | So Let us create a space character
|
| 05:08 | char SPACE equal to ' in single quotes space
|
| 05:17 | Note that I have used all uppercase letters in the variable name so that it is clear.
|
| 05:23 | You can change it as you want.
|
| 05:26 | Now let us add the space to the message.
|
| 05:29 | greet plus SPACE plus name
|
| 05:36 | save the file and run it |
| 05:40 | Now we can see the output is clear and as expected.
|
| 05:45 | Let us look at a few string operations. |
| 05:50 | I’m changing a few characters of the word “Hello” to upper case and of the word “java” to uppercase.
|
| 06:05 | Often, when users give input, we have values like this, in mixed case.
|
| 06:11 | So Let us run the file to see the output.
|
| 06:18 | As we can see t he output is not clean.
|
| 06:22 | So let us use the String methods to clean the input. |
| 06:27 | type, greet equal to greet.toLowerCase();
|
| 06:41 | This statement converts each character of the string greet to lowercase
|
| 06:47 | name equal to name.toUpperCase();
|
| 06:58 | This statement converts each character of the string name to uppercase.
|
| 07:03 | Save the file and Run it.
|
| 07:08 | As we can see, the output is now clean after we have used the String methods. |
| 07:13 | This is how we create strings and perform string operations.
|
| 07:18 | There are more String methods and |
| 07:19 | We'll discuss them as we move on to complex topics. |
| 07:26 | This brings us to the end of this tutorial. |
| 07:29 | In this tutorial we have learnt |
| 07:31 | how to create strings ,addstrings |
| 07:33 | and perform string operations like converting to lower case and upper case |
| 07:39 | As a assignment for this tutorial. |
| 07:41 | Read about the concat method of Strings in Java. - Find out how is it different from adding strings. |
| 07:50 | To know more about the Spoken Tutorial project, watch the video available at the following link. |
| 07:55 | * It summarises the Spoken Tutorial project |
| 07:58 | If you do not have good bandwidth, you can download and watch it
|
| 08:03 | The Spoken Tutorial Project Team.
|
| 08:05 | Conducts workshops using spoken tutorials.
|
| 08:07 | Gives certificates to those who pass an online test. For more details, please write to contact AT spoken HYPHEN tutorial DOT org. |
| 08:17 | Spoken Tutorial Project is a part of the Talk to a Teacher project |
| 08:21 | It supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 08:28 | More information on this Mission is available at the following linksspoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro |
| 08:33 | This tutorial has been contributed by TalentSprint. Thanks for joining.
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