How do I follow DRY in Java object setter? -

import java.util.hashmap; import java.util.map;  public class parent { }  public class child1 extends parent {   private string id;   private string name;   // getter & setter }  public class child2 extends parent {   private string id;   private string name;   // getter & setter }  public class demo {   public child1 copytoc1(map m, child1 c) {     c.setid(m.get("id"));     c.setname(m.get("name"));   }    public child2 copytoc2(map m, child2 c) {     c.setid(m.get("id"));     c.setname(m.get("name"));   }    public static void main(string args[]){         demo d =new demo();         map m=new hashmap();         m.set("id","1");         m.set("name","1name");         d.copytoc1(m,new child1);         m.set("id","2");         m.set("name","2name");         d.copytoc1(m,new child2);   } } 

i want avoid copytoc1 , copytoc2 methods tied object type want write generic copy method public t copy(map m, t t) cannot make work. how avoid dry here.

note:i using jdk7

you won't repeat not having different classes different children.

a class type of object. can have more children having multiple instances of 1 type of child.

here's version of code compiles , seems want do:

import java.util.hashmap; import java.util.map;  public class demo {   public static class parent {   }    public static class child {     private string id;     private string name;   }    public void copytochild(map<string, string> m, child c) {     c.id = m.get("id");     c.name = m.get("name");   }    public static void main(string args[]) {     demo d = new demo();     map<string, string> m = new hashmap<>();     m.put("id", "1");     m.put("name", "1name");     d.copytochild(m, new child());     m.put("id", "2");     m.put("name", "2name");     d.copytochild(m, new child());   } }