1.0 第一个代码!
// 两个斜杠表示单行注释
/* */ 这个表示多行注释
/** */ 文本注释
abstract assert booiean break byte
case catch char class const continue
defauit do double else for golo if implements
import instnceof int interface long native new
paskage private protected public return
strictfp short static super switch
synchronized this throw throws
transient try void volatile while
abstrct assert boolean break byte case catch char class const continue default do double else enum extends final finally float for doto if implements import instanceof int interface long native new package orivate protected public return strctfp short static super switch synchronized this throw throws transient try void volatile white