常见数据类型

Float f = 9.0f;
float ff = 9.0f;
Float fff = f + ff;
		
Double c = 7000.0;
double cc = 7000.0;
Double ccc = c + cc;
		
Short s = 2;
short ss = 2; 
Short sss = (short) (s + ss);
		
Integer i = 3;
int ii = 3;
Integer iii = i + ii;
		
Long l = 4L;
long ll = 4;
Long lll = l + ll;