关键字不能用做标识符。
用于内置类型:(boolean,char,byte,float,void,short,double,int,long,strictlp);
用于对象:(new,this,super);
用于语句:
{ 选择语句: if.....else , switch, case...break, default;
循环语句: for....continue, do....while;
控制转移: return , throw;
异常处理: try...catch...finally, assert;
线程语句: synchronized;
}
用于修饰声明:(static, abstract,final,private,protected,public);
用于其他方法或类:(class,transient,volatile,throw,native,instanceof);
用于类的扩展和接口的继承:(extends,interface,package,implements,import);
留做将来用的:(const,goto);