JAVA中的关键字：
abstract,assert,boolean,break,byte,case,catch,char,class,const,continue,default,do,
double,else,enum,extends,final,finally,float,for,if,implements,import,instancecof,int,
interface,long,native,new,package,private,protected,public,return,short,static,strictfp,
super,switch,synchronized,this,throw,throws,transient,try,void,volatile,while;
JAVA中的保留字：
byValue,cast,false,future,generic,inner,operator,outer,rest,true,var,goto,const,null;