Java 时间戳加减

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public static void main(String[] args){         long curSysTime = System.currentTimeMillis();       System.out.println(curSysTime);       System.out.println(new Date(curSysTime)); 　　　//减去一周       long deadtime=curSysTime-7*24*60*60*1000L;       System.out.println(deadtime);       System.out.println(new Date(deadtime));   }