Create an object dynamically in java

Question

1. Suppose I have this class:

   public class Person {
      private String name;
      private int age;
      //setters and getters
      ...
   }   
   

2. The following code is not correct, but I want something similar.

   String className="Person";
   String att1 = "name";
   String att2 = "age;
   object o = createClassByName(className);
   setValueForAttribute(o,att1,"jack");
   setValueForAttribute(o,att2,21);"
   

Answer 1

Are you familiar with hashes? I think you could use a HashMap, which is a common Hash implementation built into the Java library:

HashMap<String,Object> person1 = new HashMap<String,Object>();
person1.put("className", "Person");
person1.put("name", "Jack");
person1.put("age", 21);

Everytime you want to change the values, do: person1.put("name", "Jill")

And to get the values, it's person1.get("name")

If you want to take the class into account, you'll have to get the className and manually compare it in your code, to do different things according to the "class" of the object (which in reality is a HashMap, but nevermind).

Small reminder: doing things this way is considered very messy ;)