Difference between revisions of "Java/C2/Strings/English-timed"
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| − | | So, Let us '''run''' the file | + | | So, Let us '''run''' the file and see the output. |
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| − | | So let us use the String methods to clean the | + | | So let us use the '''String methods''' to clean the output. |
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| − | | This statement converts each character of the string '''name '''to uppercase. | + | | This statement converts each character of the string '''name''' to uppercase. |
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| − | |This is how we create '''strings''' and perform string operations. | + | |This is how we create '''strings''' and perform '''string operations'''. |
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| − | | To know more about the | + | | To know more about the Spoken Tutorial project, watch the video available at the following link. |
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| − | | Conducts workshops using | + | | Conducts workshops using Spoken Tutorials. |
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| − | | | + | | Spoken Tutorial Project is a part of the 'Talk to a Teacher' project. |
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| 08:21 | | 08:21 | ||
| − | | It supported by the National Mission on Education through ICT, MHRD, Government of India. | + | | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
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Revision as of 23:23, 21 March 2015
| 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 the knowledge of data types in Java. |
| 00:32 | If not, for relevant tutorials, 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 asterisk. |
| 01:19 | This statement creates a variable with the name star and of the type char. |
| 01:25 | It can store exactly one character. |
| 01:28 | Let us print the 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 | 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' in the print statement (println(greet)) 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 and see the output. |
| 06:18 | As we can see, the output is not clean. |
| 06:22 | So let us use the String methods to clean the output. |
| 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, add strings |
| 07:33 | and perform string operations like converting to lower case and upper case. |
| 07:39 | As an 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 summarizes 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 is 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 link: spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro. |
| 08:33 | This tutorial has been contributed by TalentSprint. Thanks for joining. |
