abstract do implement private this
boolean double import protected throw
break else instanceof public throws
byte extend int return transient
case false interface short true
catch final long static try
char fianlly native strictfp void
class float new super volatile
continue for null switch while
default if package synchronized
注:java 无sizeof ,goto, const 关键字,但不能用goto const作为变量名
INT 等类型的, PRINT 输出语句
class,public等等!