释放双眼，带上耳机，听听看~！
变量类型的几种写法
double a = 3.14;
float b = 2.769343f;
int c = 365;
byte d = 12;
char f = ‘吃’;
boolean g = false;
String sht = “不可描述”;
float a=3.14f;
float b=2.769343f;
int c=365;
int d=12;
char e=’吃’;
boolean f=false;
String g=”不可描述”;
float a=3.14f;
float b=2.769343f;
int c=365;
int d=12;
char e=’吃’;
boolean f=false;
String g=”不可描述”;
float a=3.14f;
float b=2.769343f;
short c=365;
byte d=12;
char e=’吃’;
boolean f=false;
String g=”不可描述”;
