在对象中设置字节字段

Question

I have a simple program as below:

class SerializationBox implements Serializable
{

    private byte    serializableProp    = 10;

    public byte getSerializableProp()
    {
        return serializableProp;
    }

    public void setSerializableProp(byte serializableProp)
    {
        serializableProp = serializableProp;
    }
}

public class SerializationSample
{

    /**
     * @param args
     */

    public static void main(String args[]) 
    {

        SerializationBox serialB = new SerializationBox();
        serialB.setSerializableProp(1); // Here i get an error
}
}

At the indicated place in code I get error that "The method setSerializableProp(byte) in the type SerializationBox is not applicable for the arguments (int)".

I believed that as per the link http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html , I am allowed to pass -128 to 127 as the arguement.

Please let me know what I am missing?

Answer 1

You have to cast the integer to byte :

serialB.setSerializableProp((byte) 1);

Notes:

• When you do

   private byte serializableProp = 10; 

• 10 is a integer, not a binary number. To specify that the number is a binary you have to use the following syntax:

   private byte serializableProp = 0b10; ^^ 

Answer 2

you are trying to call setSerializableProp() method with a integer literal.That is giving you compilation error.
So down cast the integer literal to byte like below.
setSerializableProp((byte)1)

Answer 3

serialB.setSerializableProp((byte)1);

这将显式地将整数文字（ 1 ）转换为一个byte