Object a = new Object();
byte[] b = a.toString().getBytes();

------解决方案--------------------
用反射试试看，

------解决方案--------------------
看你是怎么把Object变成byte[]的，逆过程。举个例子

Java code

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedList;
import java.util.Random;

public class ArrayDemo {
    public static void main(String[] args) {
        Apple a = new Apple();
        a.color = "red";
        a.type = 3;
       //now get the byte array by a apple instance
        byte[] bytes = a.toBytes();
       
        //get the instance by the byte array
        Apple b = Apple.getInstance(bytes);
        
        System.out.println(a.equals(b));
 
    }
}

class Apple{
    public String color;
    public byte type;
    public byte[] toBytes(){
        byte[] colorBytes = color.getBytes();
        byte[] bytes = new byte[colorBytes.length+1];
        System.arraycopy(colorBytes, 0, bytes, 0, colorBytes.length);
        bytes[bytes.length-1] = type;
        return bytes;
    }
    public static Apple getInstance(byte[] bytes){
        Apple apple = new Apple();
        apple.color = new String(bytes, 0, bytes.length-1);
        apple.type = bytes[bytes.length-1];
        return apple;
    }
    @Override
    public boolean equals(Object obj) {
        if(obj == null)
            return false;
        if(obj==this)
            return true;
        if(!(obj instanceof Apple))
            return false;
        Apple b = (Apple) obj;
        return b.color.equals(this.color) && this.type==b.type;
    }
}

------解决方案--------------------
new String()

------解决方案--------------------
byte[] b = (byte[]) object;