功能。（2）编写YMDjava文件，源代码如下。packageMypackage声明存放类的包
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fimportjavautil引用javautil包publicclassLX4_1_YMDprivatei
tyearmo
thdaypublicstaticvoidmai
Stri
garg3publicLX4_1_YMDi
tyi
tmi
tdyearymo
thm1m12m1dayd1d31d1publicLX4_1_YMDthis000publicstatici
tthisyearretur
Cale
dargetI
sta
cegetCale
darYEAR返回当年的年份publici
tyearretur
year返回年份publicStri
gtoStri
gretur
year