推荐用
可序列化
防反射攻击
枚举单例：
public enum EnumInstance {
INSTANCE;
private Object data;
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public static EnumInstance getInstance(){
return INSTANCE;
}
}
测试用例：
public static void main(String[] args) throws IOException {
Thread t1 = new Thread(new T());
Thread t2 = new Thread(new T());
t1.start();
t2.start();
System.out.println("program end");
EnumInstance instance = EnumInstance.getInstance();
instance.setData(new Object());
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("singleton_file"));
oos.writeObject(instance);
File file = new File("singleton_file");
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
EnumInstance newInstance = (EnumInstance) ois.readObject();
System.out.println(instance.getData());
System.out.println(newInstance.getData());
System.out.println(instance.getData() == newInstance.getData());
}
