Java variables and Data types

 

VARIABLES

Hello everyone I hope you’re doing great today it’s our next tutorial on java programming. We are going to deal with Variables and data types.

 

What is a variable?

These are objects that store data for processing in programming. So when dealing with variables we must give them names so as we can identify them when we need something we stored in them. We don’t recommend repeating names for the variables we created because it will cause confusion when we need them. As said earlier we store data through Variables have you asked yourself about the type of data?

When we store data in variables we need to assign them with their data types so as to make the device executing the codes to exactly know how to deal with the data we stored.

LINK TO THE VIDEO

 HERE

 

Here are the data types we use in Java.

 

·         BYTE

Is the smallest data type based on the list of data types in java. It’s an 8-bit signed complement integer that can store whole numbers from -128 to127 only per one byte remember keeping it into practice will work you best.

·         SHORT

It’s a 16-bit data type which can store data whole numbers from -32,768 to 32,767 you can use short to save memory in large arrays

·         INT

Now you’re free to forget about the above. An int is the most commonly used data type which can store a minimum value of 2-31 and a maximum value of 231. You might ask why we use them mostly in java than other data types it’s because we need support in the arithmetic operation for integers.

·         LONG

 The long data type is a 64-bit two complement integer. The signed long has a minimum value of -263 and a maximum value of 263-1. We use this data type when we need a range of values wider than those provided by int which it most cases it’s difficult for such thing.

·         FLOAT

Is a data type in a single-precision 32- bit floating integers. As with the recommendations for byte and short use float (instead of double) if you need to save memory in large arrays of floating-point numbers.

·         DOUBLE

Is a double-precision 64-bit floating point for decimal values, this type is generally the default choice.

When you pass through codes that are dealing with the currency you will notice that they are using double data type.

·         BOOLEAN

Let we get back in high school you ever heard of Boolean values didn’t you used in digital circuits and logic in mathematics, the same applies here we have only two things on Boolean data types it's either true or false

·         CHAR

Is a single 16-bit Unicode the character that can only store a single character/letter or ASCII value.

And the must be in a single quote (‘char goes here’)

·         STRING

 We discussed strings on the last post. We made it independent because it’s super important and used a lot in java language. Anyway, it’s used to store words or names or characters and it is placed on double quotes (“string goes here”).

LINK TO THE VIDEO;

 HERE

 

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