Java/C2/Primitive-type-conversions/English-timed

Time	Narration
00:01	Welcome to the Spoken Tutorial on Type Conversion in Java.
00:06	In this tutorial, we learn:
00:08	How to convert data from one data type to another.
00:13	The two types of conversion, namely implicit and explicit conversion and
00:18	How to convert strings to numbers.
00:23	For this tutorial we are using: Ubuntu v 11.10, JDK 1.6 and Eclipse 3.7
00:33	To follow this tutorial, you must have knowledge of data types in Java.
00:38	If not, for relevant tutorials, please visit our website as shown.
00:47	Type conversion means converting data from one data type to another.
00:53	Let us see how it it done.
00:55	Switch to Eclipse.
01:02	Here we have the 'Eclipse IDE' and the skeleton required for the rest of the code.
01:07	I have created a class TypeConversion and added the main method to it.
01:13	Now let us create a few variables.
01:19	int a equal to 5; float b; b equal to a;
01:33	I have created two variables. a which is an integer and b which is a float.
01:39	I’m storing the integer value in a float variable.
01:43	Let us see what the float variable now contains.
01:48	System dot out dot println(b);
01:58	Save the file and run it.
02:07	We can see that the integer 5 has been converted to float 5.0
02:13	This type of conversion is called implicit conversion.
02:17	As the name goes, the value is automatically converted to suit the data type.
02:24	Now let us convert float to an int, using the same method.
02:30	Remove the 5, float b equal to 2.5f and let us store 'b' in 'a' and print the value of 'a'.
02:50	Save the file.
02:56	we see that there is an error.
03:00	The error message reads- Type mismatch: cannot convert from float to int.
03:06	It means Implicit conversion is possible only from an int to a float but not the the other way.
03:13	To convert a float to an int we have to use explicit conversion.
03:17	Let us see how to do so.
03:23	We do that by using an int in parentheses, before the variable.
03:34	This statement says the data in the variable 'b' has to be converted to int data type and stored in 'a'.
03:43	save and run the file.
03:51	As we can see, the float value has been converted to int.
03:56	But to suit the data type, the data has been changed accordingly.
04:01	Explicit conversion can also be used to convert data from int to float.
04:07	Let us try the previous example.
04:10	int a =5; float b; b = (float) a;
04:32	System.out.println(b);
04:36	We are using Explicit conversion to convert integer to a float.
04:42	Save the file and Run it.
04:51	we see that the int value has been converted to a float value.
04:58	Let us see what happens when we convert a character to an integer.
05:06	int a; char c equal to in single quotes m;
05:24	a equal to (int) c;
05:32	System dot out dot println(a);
05:36	We are converting the character 'm' to an integer and printing the value.
05:43	Let us save and run it.
05:53	As we can see, the output is 109 which is the ascii value of 'm'.
05:58	It means when a char is converted to int, its ascii value is stored.
06:03	Let us try this with a digit.
06:06	char c = digit 5;
06:11	Save it and run it.
06:18	As we can see, the output is 53 which is the ascii value of the character ‘5’.
06:24	It is not the number 5.
06:26	To get the number, we have to use a string and convert it to an integer.
06:31	Now let us see how to do so.
06:33	Clean up the main function.
06:38	Type:
06:40	String sHeight meaning string form of Height equal to in double quotes 6
06:58	int h equal to explicit conversion int of sHeight and
07:11	System dot out dot println(h) Save the file.
07:27	I’ve created a string variable with value 6 and I am trying to convert it to an integer but we see that there is an error
07:37	and the error message reads: Cannot cast from String to int.
07:42	This means, for converting strings, we cannot use implicit or explicit conversion.
07:48	It must be done by other methods. let us use them.
07:58	Remove int sHeight and type Integer dot parseInt sHeight;
08:21	Save the file and run it.
08:29	we see that the value has been successfully converted to an integer.
08:35	To do this, we use the parseInt method of the integer module.
08:41	Now let us see what happens if there are more than one digits like "6543"
08:49	Save the file and run it.
08:55	We see that again the string containing the number has been successfully converted to an integer.
09:03	Now, let us see what happens if the string is a floating point number.
09:10	Change "6543" to "65.43". So, we have a floating point number in a string and we are converting it to an integer.
09:22	Save the file, run it.
09:31	We see that there is an error. This happens because we cannot convert a string which contains floating point number into an integer.
09:41	We have to convert it to a float. Let us see how to do so.
09:45	First, data type should be float,
09:51	second we will use Float. parseFloat.
10:07	We are using the parseFloat method of the float class to convert the string containing a floating point number into an actual floating point number.
10:18	Save the file, run it. We can see that the string containing a floating point number has been successfully converted to a floating point number.
10:33	And this is how we do implicit and explicit conversion and how we convert strings to numbers.
10:45	This brings us to the end of the tutorial.
10:48	In this tutorial we have learnt: How to convert data from one type to another.
10:54	What is meant by implicit and explicit conversion.
10:57	and How to convert strings to numbers.
11:01	As an assignment for this tutorial, read about the Integer.toString and Float.toString methods
11:07	and find out what do they do?
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11:55	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Gaurav, Kavita salve, PoojaMoolya, Priyacst, Sandhya.np14, Sneha