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1Java Data Types
2As explained in the previous chapter, a variable in Java must be a specified data type:
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6Data types are divided into two groups:
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8Primitive data types - includes byte, short, int, long, float, double, boolean and char
9Non-primitive data types - such as String, Arrays and Classes (you will learn more about these in a later chapter)
10Primitive Data Types
11A primitive data type specifies the size and type of variable values, and it has no additional methods.
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13There are eight primitive data types in Java:
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15Data Type	Size	Description
16byte	1 byte	Stores whole numbers from -128 to 127
17short	2 bytes	Stores whole numbers from -32,768 to 32,767
18int	4 bytes	Stores whole numbers from -2,147,483,648 to 2,147,483,647
19long	8 bytes	Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
20float	4 bytes	Stores fractional numbers. Sufficient for storing 6 to 7 decimal digits
21double	8 bytes	Stores fractional numbers. Sufficient for storing 15 decimal digits
22boolean	1 bit	Stores true or false values
23char	2 bytes	Stores a single character/letter or ASCII values
24Numbers
25Primitive number types are divided into two groups:
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27Integer types stores whole numbers, positive or negative (such as 123 or -456), without decimals. Valid types are byte, short, int and long. Which type you should use, depends on the numeric value.
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29Floating point types represents numbers with a fractional part, containing one or more decimals. There are two types: float and double.
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