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Date dat1=new Date();
Date dat2=new Date();
int num = dat1.compareTo(dat2);
如果 dat1>dat2 num = 1;
dat1=dat2 num = 0;
dat1<dat2 num = -1;
int num = dat1.compareTo(dat2);
如果 dat1>dat2 num = 1;
dat1=dat2 num = 0;
dat1<dat2 num = -1;