Memento 备忘录

记录状态便于回滚
记录对象的某一个瞬间（快照）
序列化与反序列化
public class Memento {
  public static void main(String[] args) {
      Test test = new Test(1,2,"测试");
      File file = new File("d:/LZY/test.data");
      ObjectOutputStream objectOutputStream = null;
      ObjectInputStream objectInputStream = null;
      try {
          objectOutputStream = new ObjectOutputStream(new FileOutputStream(file));
          objectInputStream = new ObjectInputStream(new FileInputStream(file));
          objectOutputStream.writeObject(test);
          Test test1 = (Test) objectInputStream.readObject();
          System.out.println(test1.toString());
      } catch (IOException e) {
          e.printStackTrace();
      } catch (ClassNotFoundException e) {
          e.printStackTrace();
      } finally{
          if(objectOutputStream!=null){
              try {
                  objectOutputStream.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          if (objectInputStream !=null){
              try {
                  objectInputStream.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
      }
  }
}
class Test implements Serializable {
  int a;
  int b;
  String str;
  public Test(int a, int b, String str) {
      this.a = a;
      this.b = b;
      this.str = str;
  }
  public String toString(){
      return "a:"+a+" b:"+b+" str:"+str;
  }
}