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1. What are the 8 basic data types of Java?

Understanding data Types Look here: What is the Java type of data
The basic data types include 4 categories, each of which corresponds to a wrapper for a class type (wrapper Class), as follows:
Learn about the basic type wrapper look here: [What is the basic type wrapper][3]
[3]:

2. Byte
   The byte data type is a 8-bit, signed, integer in binary complement notation;
   The minimum value is-128 ( -2^7);
   The maximum value is 127 (2^7-1);
   The default value is 0;
   The byte type is used to save space in large arrays, mainly in place of integers, because the byte variable occupies only one-fourth of the int type;
   Example: Byte a = 100,byte B =-50.
   Here 100 and 50 are all Java literals, see here: [What is the literal value of Java data type][4]
   [4]:

4. Short
   The short data type is a 16-bit, signed, Integer that is represented by a binary complement
   The minimum value is-32768 ( -2^15);
   The maximum value is 32767 (2^15-1);
   The short data type can also save space as Byte. A short variable is one-second of the space occupied by the int variable;
   The default value is 0;
   Example: Short s = 1000,short r =-20000.

6. Int
   The int data type is a 32-bit, signed integer that is represented by a binary complement;
   The minimum value is-2,147,483,648 ( -2^31);
   The maximum value is 2,147,485,647 (2^31-1);
   The generic integer variable defaults to the int type;
   The default value is 0;
   Example: int a = 100000, int b =-200000.

8. Long
   The Long data type is a 64-bit, signed, integer in binary complement notation;
   The minimum value is-9,223,372,036,854,775,808 ( -2^63);
   The maximum value is 9,223,372,036,854,775,807 (2^63-1);
   This type is mainly used on systems that need to compare large integers;
   The default value is 0L;
   Example: Long a = 100000l,long B = -200000l.

10. Float
    The float data type is a single-precision, 32-bit, IEEE 754 compliant floating-point number;
    Float saves memory space when storing large floating-point groups;
    The default value is 0.0f;
    Floating-point numbers cannot be used to denote precise values, such as currency;
    Example: float f1 = 234.5f.

12. Double
    The double data type is a dual-precision, 64-bit, IEEE 754-compliant floating-point number;
    The default type of floating-point number is double type;
    A double type cannot also represent an exact value, such as a currency;
    The default value is 0.0d;
    Example: Double D1 = 123.4.

14. Boolean
    The Boolean data type represents one bit of information;
    Only two values: true and false;
    This type is only used as a sign to record the true/false situation;
    The default value is false;
    Example: Boolean one = True.

16. Char
    The char type is a single 16-bit Unicode character;
    Unicode is a fully internationalized character set that can represent characters in all human languages. Unicode requires 16-bit width.
    is a special type of int;
    The minimum value is ' \u0000 ' (that is, 0);
    The maximum value is ' \uffff ' (that is, 65,535);
    Char data type can store any character;
    Example: char letter = ' A '.

2. Relationship of basic data types

Basic data types are essentially binary 0, 1, so there must be a correlation between, of course, can be conditional conversion, the specific conversion look here:
[How Java basic data types are converted] [5]
[5]:

Java technology _java Thousands of questions (0043) _java What are the 8 basic data types