Basic types in Java consume bytes

Due to the limitations of mobile device memory in mobile development, it is often necessary to consider the number of bytes consumed by the data type used. Below is a brief introduction to some basic data types in Java to deepen your memory.
There are 8 basic data types in Java, including 4 integers, 2 floating-point types, 1 character types used to represent Unicode-encoded character cells, and 1 Boolean types that represent truth values. (one byte equals 8 bit)

1. Integral type
Type storage requirement bit number value range remark
int 4 byte 4*8
Short 2 byte 2*8-32768~32767
Long 8 byte 8*8
BYTE 1 byte 1*8-128~127

2. Floating-point type
Type storage requirement bit number value range remark
Float 4 byte 4*8 float type has a suffix f (for example: 3.14F)
Double 8 byte 8*8 floating-point value with no suffix f (for example, 3.14) defaults to double type

3.char type
Type storage Requirements
Char English byte, Chinese 2 bytes (not necessarily under other encodings)

4.boolean type
Type storage requirement bit number value range remark
Boolean 1 byte 1*8 false, True

Add: Java has a schoolbag that can represent any precision, often called a "big number". Although it is called a large value, it is not a Java type, but a Java object.

If the basic integer and floating-point precision are not sufficient, then two useful classes in the Java.math package can be used: Bigintegerbigdecimal (also included in the Android SDK Java.math package and these two classes) These two classes can handle numeric values that contain a sequence of arbitrary lengths. The BigInteger class realizes the integer operation of arbitrary precision, and BigDecimal realizes the floating-point number operation with arbitrary precision. Specific usage can be found in the Java API.

Basic types in Java consume bytes