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Convert byte[] to long in Java

12904 hits

byte[] vInt = new byte[] {
(byte)(9223372036854775807L >>> 56),
(byte)(9223372036854775807L >>> 48),
(byte)(9223372036854775807L >>> 40),
(byte)(9223372036854775807L >>> 32),
(byte)(9223372036854775807L >>> 24),
(byte)(9223372036854775807L >>> 16),
(byte)(9223372036854775807L >>> 8),
(byte)9223372036854775807L};
long vOut = (vInt[0] << 56)
+ ((vInt[1] & 0xFF) << 48)
+ ((vInt[2] & 0xFF) << 40)
+ ((vInt[3] & 0xFF) << 32)
+ ((vInt[4] & 0xFF) << 24)
+ ((vInt[5] & 0xFF) << 16)
+ ((vInt[6] & 0xFF) << 8)
+ (vInt[7] & 0xFF);

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