测试 单例通过反序列化出来就不再是单例,反序列化时会反射创建一个新的对象出来
public class SerializableSingle { public static void main(String[] args) throws Exception { ObjectOutputStream obc = new ObjectOutputStream(new FileOutputStream(new File("d:/single.txt"))); obc.writeObject(Single003.getInstance()); ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File("d:/single.txt"))); Single003 readObject = (Single003)ois.readObject(); System.out.println(readObject == Single003.getInstance());//false } }
解决就是在单例中定义readResolve()方法