There are four basic data types of Java: integer, floating point, character and Boolean.

1, integer type

Integer type variables are used to represent the data type of integers. There are four types of integers: byte type, short integer type, integer type and long type.

2. Floating-point type

Floating-point is a data type used to represent decimals. Floating-point types are divided into float (single precision type) and double (double precision type). Float (single precision type) is generally used when the accuracy requirement is not high. Double (double precision type) is generally used in the case of high numerical precision.

3. Character type

The keyword of character type is "char".

4. Boolean type

Boolean type is the basic data type representing logical values. Boolean constants have two states: true and false. Generally, truth means "truth" and falsehood means "falsehood". It is defined by adding the type keyword boolean before the variable name.