Data types for Java

Data types for Java

First, the underlying data type:

It is divided into numerical, character and Boolean types.

Where: Numerical type is divided into integral type, floating point type

Integer: int, accounting for four bytes

Short

Long

Byte

Float type: float: 4 bytes (Float a = 185.2f;)

Double: occupies 8 bytes

Character type: Char: 2 bytes (char a = ' a ';)

Boolean: Boolean: 1 bytes

II. Reference data types

The difference between a reference data type and a base data type is that the reference type stores the address of the referenced object in memory, and the data type is the data;

So comparisons between data types are equal with = =, whereas reference types are best used equals () to compare the actual values of two objects for equality

Common reference data types are classes, interfaces, and arrays, and so on;

The most common is probably a String.

Data types for Java