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int a = 0xFF5100A5;
long b = 0;
for (int i=28; i>=0; i-=4) {
b = b<<4 | (a>>>i & 0xF);
}
System.out.println(b);
System.out.printf("%X\n", b);
int a = 0xFF5100A5;
long b = 0x00000000FFFFFFFFL & a;
System.out.printf("%016X", b);