long 長度查過2^31-1則變成負數
long j = 720*60*60*1000;
System.out.println(j);
輸出: -1702967296
long l = 60*60*1000;
long h = 720*l;
System.out.println(h);
輸出:2592000000
long 長度查過2^31-1則變成負數
long j = 720*60*60*1000;
System.out.println(j);
輸出: -1702967296
long l = 60*60*1000;
long h = 720*l;
System.out.println(h);
輸出:2592000000