Java中已有的 Number ●C| ass number Method Summary byte byte O Returns the value of the specified number as a byte. abstract double O double Returns the value of the specified number as a double abstract float value O float Returns the value of the specified number as a float abstract intValueO ant Returns the value of the specified number as an int abstract long Value long Returns the value of the specified number as a long. short shortValueO Returns the value of the specified number as a shortJava中已有的Number Class Number