Difference between revisions of "Java/C2/Strings/English-timed"
From Script | Spoken-Tutorial
Sandhya.np14 (Talk | contribs) |
PoojaMoolya (Talk | contribs) |
||
(3 intermediate revisions by one other user not shown) | |||
Line 4: | Line 4: | ||
|- | |- | ||
| 00:01 | | 00:01 | ||
− | | Welcome to the spoken tutorial on '''Strings in Java'''. | + | | Welcome to the spoken tutorial on '''Strings''' in '''Java'''. |
|- | |- | ||
Line 12: | Line 12: | ||
|- | |- | ||
| 00:08 | | 00:08 | ||
− | | | + | | create strings, add strings and perform basic string operations like converting to lower case and upper case. |
|- | |- | ||
Line 32: | Line 32: | ||
|- | |- | ||
| 00:40 | | 00:40 | ||
− | | '''String''' in Java | + | | '''String''' in Java is a sequence of '''characters'''. |
|- | |- | ||
Line 44: | Line 44: | ||
|- | |- | ||
|00:55 | |00:55 | ||
− | | | + | | We have the 'Eclipse IDE' and the skeleton required for the rest of the code. |
|- | |- | ||
| 01:00 | | 01:00 | ||
− | | We have created a class '''StringDemo''' and added the '''main method'''. | + | | We have created a '''class''' '''StringDemo''' and added the '''main method'''. |
|- | |- | ||
| 01:07 | | 01:07 | ||
− | | Inside the '''main method''', type: '''char star ''' equal to in single quotes | + | | Inside the '''main method''', type: '''char star ''' equal to in single quotes asterisk. |
|- | |- | ||
|01:19 | |01:19 | ||
− | | This statement creates a variable with name '''star''' and of the type '''char.''' | + | | This statement creates a variable with the name '''star''' and of the type '''char.''' |
|- | |- | ||
Line 63: | Line 63: | ||
|- | |- | ||
| 01:28 | | 01:28 | ||
− | | Let us print | + | | Let us print the word using a few characters. |
|- | |- | ||
Line 71: | Line 71: | ||
|- | |- | ||
| 01:36 | | 01:36 | ||
− | | '''char c1''' equal to in single quotes 'c' | + | | '''char c1''' equal to in single quotes 'c'; |
|- | |- | ||
| 01:43 | | 01:43 | ||
− | | '''char c2''' equal to in single quotes 'a' | + | | '''char c2''' equal to in single quotes 'a'; |
|- | |- | ||
| 01:49 | | 01:49 | ||
− | | '''char c3''' equal to in single quotes 'r' | + | | '''char c3''' equal to in single quotes 'r'; |
|- | |- | ||
Line 87: | Line 87: | ||
|- | |- | ||
| 01:59 | | 01:59 | ||
− | | | + | | Let us use them to print the word. |
|- | |- | ||
Line 111: | Line 111: | ||
|- | |- | ||
| 02:39 | | 02:39 | ||
− | | ''' | + | | '''Save''' the file and '''run''' it. |
|- | |- | ||
Line 143: | Line 143: | ||
|- | |- | ||
| 03:19 | | 03:19 | ||
− | | And we are using double quotes instead of | + | | And we are using double quotes instead of single quotes as delimiters. |
|- | |- | ||
Line 159: | Line 159: | ||
|- | |- | ||
| 03:44 | | 03:44 | ||
− | | Save | + | | '''Save''' the file and '''run''' it. |
|- | |- | ||
| 03:51 | | 03:51 | ||
Line 170: | Line 170: | ||
|- | |- | ||
| 04:00 | | 04:00 | ||
− | | | + | | Let us see how to do so. |
|- | |- | ||
Line 182: | Line 182: | ||
|- | |- | ||
| 04:14 | | 04:14 | ||
− | | '''String name '''equal to “Java”; | + | | '''String name''' equal to “Java”; |
|- | |- | ||
| 04:22 | | 04:22 | ||
− | | Now we’ll add the strings to make a message. | + | | Now, we’ll add the strings to make a message. |
|- | |- | ||
Line 194: | Line 194: | ||
|- | |- | ||
| 04:42 | | 04:42 | ||
− | | change the greet | + | | change the 'greet' in the print statement ('''println(greet)''') to 'message' ('''println(msg)''') '''save''' the file and '''run''' it. |
|- | |- | ||
Line 206: | Line 206: | ||
|- | |- | ||
| 05:02 | | 05:02 | ||
− | | So, let us create a space character. | + | | So, let us create a '''space''' character. |
|- | |- | ||
| 05:08 | | 05:08 | ||
− | | '''char SPACE''' equal to | + | | '''char SPACE''' equal to in single quotes ' '(space); |
|- | |- | ||
Line 222: | Line 222: | ||
|- | |- | ||
| 05:26 | | 05:26 | ||
− | | Now, let us add the ''' | + | | Now, let us add the '''SPACE''' to the message. |
|- | |- | ||
| 05:29 | | 05:29 | ||
− | | '''greet''' plus SPACE plus '''name''' | + | | '''greet''' plus '''SPACE''' plus '''name'''; |
|- | |- | ||
Line 250: | Line 250: | ||
|- | |- | ||
| 06:11 | | 06:11 | ||
− | | So, Let us '''run''' the file | + | | So, Let us '''run''' the file and see the output. |
|- | |- | ||
Line 258: | Line 258: | ||
|- | |- | ||
| 06:22 | | 06:22 | ||
− | | So let us use the String methods to clean the | + | | So let us use the '''String methods''' to clean the output. |
|- | |- | ||
Line 274: | Line 274: | ||
|- | |- | ||
| 06:58 | | 06:58 | ||
− | | This statement converts each character of the string '''name '''to uppercase. | + | | This statement converts each character of the string '''name''' to uppercase. |
|- | |- | ||
Line 282: | Line 282: | ||
|- | |- | ||
| 07:08 | | 07:08 | ||
− | | As we can see, the output is now clean after we have used the String methods. | + | | As we can see, the output is now clean after we have used the '''String methods'''. |
|- | |- | ||
| 07:13 | | 07:13 | ||
− | |This is how we create '''strings''' and perform string operations. | + | |This is how we create '''strings''' and perform '''string operations'''. |
|- | |- | ||
| 07:18 | | 07:18 | ||
− | | There are more '''String methods''' and | + | | There are more '''String methods''' and we'll discuss them as we move on to complex topics. |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
Line 314: | Line 310: | ||
|- | |- | ||
| 07:39 | | 07:39 | ||
− | + | | As an assignment for this tutorial: | |
− | + | ||
|- | |- | ||
Line 323: | Line 318: | ||
|- | |- | ||
| 07:50 | | 07:50 | ||
− | | To know more about the | + | | To know more about the Spoken Tutorial project, watch the video available at the following link. |
|- | |- | ||
Line 339: | Line 334: | ||
|- | |- | ||
| 08:05 | | 08:05 | ||
− | | Conducts workshops using | + | | Conducts workshops using Spoken Tutorials. |
|- | |- | ||
Line 347: | Line 342: | ||
|- | |- | ||
| 08:17 | | 08:17 | ||
− | | | + | | Spoken Tutorial Project is a part of the 'Talk to a Teacher' project. |
|- | |- | ||
| 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. |
|- | |- | ||
| 08:28 | | 08:28 |
Latest revision as of 12:57, 28 March 2017
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 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. |