JAVA basic data types and the reference data type

Basic data types

1. Integer: byte, short, int, long

   Bytes: 1248

2. Float: float, double

    Bytes: 48

3. Boolean: true, false

     Bytes: 1         

Reference data types

1. Class

2. Array

3. Interface

A byte accounted for eight

Digital literal: a digital code which appears

If is an integer, it will default to type int

If a decimal, the default type double

Literals: the code is "" contained in the content.