Java/C2/Relational-Operations/English-timed

Time	Narration
00:01	Welcome to the spoken tutorial on Relational Operators in Java.
00:07	In this tutorial, we will learn about the
00:09	boolean data type,
00:10	Relational operators and
00:12	how to compare data using Relational operators.
00:17	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.
00:31	If not, for relevant tutorials, please visit our website as shown.
00:39	Relational operators are used to check for conditions.
00:43	Their output is a variable of boolean data type.
00:48	A boolean data type is of size 1 bit.
00:51	It stores only two values.
00:54	true or false.
00:56	true is the output when the condition is true.
00:59	false is the output if the condition is not true.
01:06	Here is a list of the relational operators available.
01:10	* greater than
01:12	* less than
01:13	* equal to
00:14	* greater than or equal to
01:15	* less than or equal to
01:17	* not equal to
01:19	We shall look into each of them in detail.
01:22	Switch to Eclipse.
01:27	Here we have the Eclipse IDE and the skeleton required for the rest of the code.
01:33	I have created a class BooleanDemo and added the Main method.
01:38	Now let us add some expressions.
01:41	Type boolean b ;
01:47	The keyword boolean declares the data type of the variable b as boolean.
01:53	We shall store the result of our condition in b.
01:58	We shall define a variable weight and check for a condition using that variable.
02:05	int weight equal to 45;
02:13	We shall check if the value in weight is greater than 40.
02:18	b equal to weight greater than 40;
02:28	This statement says: check if the value of variable is greater than 40 and store the result in 'b'.
02:37	Now, let us print the value of 'b'.
02:41	System dot out dot println(b);
02:49	Save and Run.
02:59	As we can see, the output is True.
03:02	Let us see what happens if the value is less than 40.
03:07	Change weight to 30.
03:12	Save and run.
03:20	We can see that the output is False as expected.
03:24	This way, the greater than symbol is used to check if one value is greater than the other.
03:30	Similarly, less than symbol is used to check if one value is less than the other.
03:37	Let us change the greater than to less than symbol.
03:43	So, We are checking if the value of weight is less than 40.
03:48	Save, Run.
03:56	As we can see, the output is true as expected.
04:01	Let us change the value of weight to 45 and see the output.
04:09	Save and Run.
04:16	We see that we get a false because the condition
04:21	weight less than 40 is not true.
04:25	Now let us see how to check if a value is equal to another.
04:31	To do that, we use two equal to symbols.
04:35	Change less than symbol to double equal to.
04:41	Save and Run.
04:48	As we can see, the output is false because the value of weight is not equal to 40.
04:55	Now let us change the weight to 40 and see the output.
05:01	Save and Run.
05:08	As we can see, the output is True.
05:12	This way, double equal to is used for checking equality.
05:16	Please be careful because, often people use a single equal to symbol for checking equality.
05:22	And this gives unnecessary errors.
05:26	Next we'll see how to check for less than or equal to.
05:30	To do that, we will use a less than symbol followed by an equal to symbol.
05:35	Change the double equal to, to less than equal to.
05:42	Save and Run.
05:50	The output is True as expected.
05:53	Now let us change the value of weight to see if the less than check is performed.
05:59	Change 40 to 30.
06:04	Save and Run.
06:14	We see, that although the weight is not equal to 40 we get the output as True because it is less than 40.
06:22	Let us see what happens if the value of weight is greater than 40.
06:27	Let's say 50. Save and Run.
06:39	As we can see, the output is False because the value of weight is not equal to 40.
06:44	And it also not less than 40.
06:48	Similarly, we use a greater than symbol followed by an equal to symbol for checking greater than or equal to.
06:55	Let us try it.
06:57	Change less than equal to to greater than equal to.
07:04	Save and Run.
07:10	As we can see, the output is true because weight is greater than 40.
07:16	Let us change weight to a value less than 40. Let's say 30.
07:25	Save and Run.
07:32	We get a false because the value of weight is not greater than 40 and also not equal to 40.
07:39	Next, we’ll see how to check for not equal to.
07:46	It is done by using an exclamation mark followed by an equal to symbol.
07:53	Change greater than to exclamation.
07:59	So, this statement says: check if the value of weight is not equal to 40 and store the result in b.
08:08	Save and Run.
08:16	As we can see, the output is true because the values of weight is not equal to 40.
08:23	Let us change the weight to 40 and see the output.
08:28	Change 30 to 40.
08:31	Save, Run.
08:38	We get a false because the condition weight not equal to 40 is false.
08:45	The not equal to condition can be thought of as opposite of equal to condition.
08:50	This is how we use the various relational operators to compare data in Java.
08:58	This brings us to the end of this tutorial.
09:01	In this tutorial we have learnt about: the boolean data type,
09:06	the relational operators and
09:08	how to use relational operators to compare data.
09:13	As an assignment for this tutorial, find out if the two expressions shown are equivalent.
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10:05	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Ranjana, Sandhya.np14, Sneha