“(a < 24 | b < 16 | c < 8 | d)”是什么意思?

 public int getRGB(Object inData) {
     return (getAlpha(inData) << 24)
         | (getRed(inData) << 16)
         | (getGreen(inData) << 8)
         | (getBlue(inData) << 0);

 }
 public int getRGB(Object inData) {
     return