Basic types of knowledge points
Integer type
byte
shrot
int
long
floating point type
float
double
character type
char
Summary of knowledge points
-
Primitive types are stored on the stack
-
Byte short char operations will be converted to int type
Unboxing and packing
Basic data types correspond to wrapper classes
Integer type
Byte
Shrot
Integer
Long
floating point type
Float
Double
character type
Character
Summary of knowledge points
-
Primitive types can be passed ==, or ! = make a conditional judgment
-
Byte is the wrapper type of byte, initialized to null instead of 0;
-
intValue() is the basic data type that turns the Integer object type into an int;
-
parseInt() is the basic data type that turns String into int;
-
Valueof() converts String to Integer object type; (now the JDK version supports automatic boxing and unboxing.)