Floating-Point Types - Java Language Tutorial

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The 32-bit data type float and the 64-bit data type double represent the real types in Java.
They can be expressed as a number with decimals or with exponential notation in which a number is followed by the letter E or e and another number.
The second number is the power of then with which the first number is multiplied.

Floating-point numbers are considered of type double by default, so to specify that it's really of type float an f or F has to be added at the end of the number.

1.2345 //considered double

1.2345F //tells the compiler that it is to be treated as a float value.

As with integer types, floating-point types have corresponding wrapper classes named 'Float' and 'Double'.

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