Question

how to get a specific java object from java.util.List<Object> using equals method
exemple :

  Class Person{
       String name;
       int age;
       //...

       @Override
       public boolean equals(String str) {
            return (this.name.equals(str.name));
       }
    }

main{
   List<Person> list = personDao.findAll();

   if(list.contain("joe")){
      // how to get the Person named joe ????
   }
}

Answer 1

If you want to get a reference to the specific Person in the List:

Person foo = null;
for (Person p : list) {
    if (p.getName().equals("joe")) {
        foo = p;
        break;
    }
}
// now foo is your person (if he exists) or null (if he doesnt exist);

This will only find the first Person named joe.