基本数据类型

八大基本数据类型boolean,char,short,byte,int,long,float,double
八大基本数据类型的包装类Boolean,Character,Short,Byte,Integer,Long,Float,Double
short,byte,char在进行运算时会自己转化成int型
例如:
byte a=0,b=4;
byte c=a+b;----编译出错
byte c=(byte)(a+b);----- a,b自动转化成int型再运算

以下是基本数据的参数查找优先级
boolean参数查找优先级:boolean,Boolean
short参数查找优先级:short,int,Short
byte参数查找优先级:byte,short,int,long,Byte,float,double
char参数查找优先级:char,int,long,float,double,Character
int参数查找优先级:int,long,float,double,Integer
long参数查找优先级:long,float,double,Long
float参数查找优先级:float,double,Float
double参数查找优先级:double,Double