I want to store an arraylist to disk, so I use gson to convert it to string
ArrayList<Animal> anim=new ArrayList<Animal>();
Cat c=new Cat();
Dog d=new Dog();
c.parentName="I am animal C";
c.subNameC="I am cat";
d.parentName="I am animal D";
d.subNameD="I am dog";
anim.add(c);
anim.add(d);
Gson gson=new Gson();
String json=gson.toJson(anim);
public class Animal {
public String parentName;
}
public class Cat extends Animal{
public String subNameC;
}
public class Dog extends Animal{
public String subNameD;
}
output string:
[{"subNameC":"I am cat","parentName":"I am animal C"},{"subNameD":"I am dog","parentName":"I am animal D"}]
Now I want use this string to convert back to arraylist
I know I should use something like:
ArrayList<Animal> anim = gson.fromJson(json, ArrayList<Animal>.class);
But this is not correct, what is the correct syntax?