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public class User {
int id;
String email;
String pwd;
public User(){}
public User(int id, String email, String pwd){
super();
this.id = id;
this.email = email;
this.pwd = pwd;
}
public String toString() { return id + "," + email;}
public boolean equals(Object obj) {
if(obj == null) {
return false;
}
if(this == obj)
return true;
if(obj instanceof User) {
User o = (User) obj;
return id == o.id;
}
return false;
}
public int hashCode() { return id;}
}
if( obj instanceof User )
==>
if( obj != null && User.class.isInstance(obj) )