Self Java basic data types of day01_Java

Data type classification

In Java as a programming language, different data belong to different data types

Java data types are divided into two categories:

• Basic data types include: integers, floating point, character, Boolean.
• Reference data types : a class, arrays, interfaces.

Four eight basic data types as shown below:

Precautions:

• String is not a basic type, but reference types.
• Float may only be an approximation, not an exact value.
• The number of bytes of data does not necessarily correlate with the range of, for example, a wider range than the data float long, but float is 4 bytes, long 8 bytes.
• Among the default floating-point type is double. If you must use a float, you need to add a suffix F.
• If is an integer, the default type int, if we must use the long type, you need to add a suffix L. We recommend the use of capital letters suffix.