What are the eight basic data types?

The eight basic data types are: 1. byte type, 8-bit, signed integer expressed in two's complement; 2. short type, 16-bit, signed integer expressed in two's complement ; 3. Int type, 32-bit, signed integer represented by two's complement; 4. Long type, 64-bit, signed integer represented by two's complement.

The eight basic data types are:

Let’s talk about the theory first, the eight basic data types: byte, short , int, long, float, double, boolean, char.

1, byte

• 8-bit, signed two’s complement integer representation

• min : -128（-2^7）

• max: 127(2^7-1)

• default: 0

• Corresponding packaging class: Byte

2, short

• 16 Bit, signed two's complement integer

• min : -32768 (-2^15)

• max: 32767 ( 2^15 - 1)

• default: 0

• Corresponding packaging class: Short

3, int

• 32-bit, signed integer expressed in two’s complement number

• min : -2,147,483,648 (-2^31)

• max: 2,147,483,647 (2^31 - 1)

• ##default: 0

• Corresponding packaging class: Integer

4, long

• 64-bit, signed Integer represented by two's complement number

##min : -9,223,372,036,854,775,808 (-2^63)
max: 9,223,372,036,854,775,807 (2^63 -1)
default: 0
Corresponding packaging class: Long
##5, float

Single-precision, 32-bit, IEEE 754-compliant floating point number

• float When storing large floating point arrays Can save memory space

• Floating point numbers cannot be used to represent precise values, such as currencies

• default: 0.0f

• Corresponding packaging class: Float
6, double

Double precision, 64-bit, Floating point numbers that comply with the IEEE 754 standard

• The default type of floating point numbers is the double type

• The double type also cannot represent precise values, such as currency

• default: 0.0d

• Corresponding packaging class: Double
7, char

The char type is a single 16-bit Unicode character

• The minimum value is \u0000 (that is, 0)

• The maximum value is \uffff (that is, 65,535)

• char data type can store any character

• Corresponding packaging class: Character

• ##8, boolean

##boolean data type represents one bit of information

• There are only two values: true and false

• This type is only used as a flag to record true/false situations

• Corresponding packaging class: Boolean

• Instance
  For the value range of the basic type of numeric type, we do not need to force it to remember, because Their values ​​have been defined in the corresponding packaging classes in the form of constants. Please look at the example below:

public class Test {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        // byte
        System.out.println("基本类型：byte 二进制位数：" + Byte.SIZE);
        System.out.println("包装类：java.lang.Byte");
        System.out.println("最小值：Byte.MIN_VALUE=" + Byte.MIN_VALUE);
        System.out.println("最大值：Byte.MAX_VALUE=" + Byte.MAX_VALUE);
        System.out.println();
        // short
        System.out.println("基本类型：short 二进制位数：" + Short.SIZE);
        System.out.println("包装类：java.lang.Short");
        System.out.println("最小值：Short.MIN_VALUE=" + Short.MIN_VALUE);
        System.out.println("最大值：Short.MAX_VALUE=" + Short.MAX_VALUE);
        System.out.println();
        // int
        System.out.println("基本类型：int 二进制位数：" + Integer.SIZE);
        System.out.println("包装类：java.lang.Integer");
        System.out.println("最小值：Integer.MIN_VALUE=" + Integer.MIN_VALUE);
        System.out.println("最大值：Integer.MAX_VALUE=" + Integer.MAX_VALUE);
        System.out.println();
        // long
        System.out.println("基本类型：long 二进制位数：" + Long.SIZE);
        System.out.println("包装类：java.lang.Long");
        System.out.println("最小值：Long.MIN_VALUE=" + Long.MIN_VALUE);
        System.out.println("最大值：Long.MAX_VALUE=" + Long.MAX_VALUE);
        System.out.println();
        // float
        System.out.println("基本类型：float 二进制位数：" + Float.SIZE);
        System.out.println("包装类：java.lang.Float");
        System.out.println("最小值：Float.MIN_VALUE=" + Float.MIN_VALUE);
        System.out.println("最大值：Float.MAX_VALUE=" + Float.MAX_VALUE);
        System.out.println();
        // double
        System.out.println("基本类型：double 二进制位数：" + Double.SIZE);
        System.out.println("包装类：java.lang.Double");
        System.out.println("最小值：Double.MIN_VALUE=" + Double.MIN_VALUE);
        System.out.println("最大值：Double.MAX_VALUE=" + Double.MAX_VALUE);
        System.out.println();
        // char
        System.out.println("基本类型：char 二进制位数：" + Character.SIZE);
        System.out.println("包装类：java.lang.Character");
        // 以数值形式而不是字符形式将Character.MIN_VALUE输出到控制台
        System.out.println("最小值：Character.MIN_VALUE="+ (int) Character.MIN_VALUE);
        // 以数值形式而不是字符形式将Character.MAX_VALUE输出到控制台
        System.out.println("最大值：Character.MAX_VALUE="+ (int) Character.MAX_VALUE);
    }
}

Result:

基本类型：byte 二进制位数：8
包装类：java.lang.Byte
最小值：Byte.MIN_VALUE=-128
最大值：Byte.MAX_VALUE=127

基本类型：short 二进制位数：16
包装类：java.lang.Short
最小值：Short.MIN_VALUE=-32768
最大值：Short.MAX_VALUE=32767

基本类型：int 二进制位数：32
包装类：java.lang.Integer
最小值：Integer.MIN_VALUE=-2147483648
最大值：Integer.MAX_VALUE=2147483647

基本类型：long 二进制位数：64
包装类：java.lang.Long
最小值：Long.MIN_VALUE=-9223372036854775808
最大值：Long.MAX_VALUE=9223372036854775807

基本类型：float 二进制位数：32
包装类：java.lang.Float
最小值：Float.MIN_VALUE=1.4E-45
最大值：Float.MAX_VALUE=3.4028235E38

基本类型：double 二进制位数：64
包装类：java.lang.Double
最小值：Double.MIN_VALUE=4.9E-324
最大值：Double.MAX_VALUE=1.7976931348623157E308

基本类型：char 二进制位数：16
包装类：java.lang.Character
最小值：Character.MIN_VALUE=0
最大值：Character.MAX_VALUE=65535

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