Accessing objects from different classes

[Swapnil Sanghai]

How can I pass object created in one class to the other class.(Both classes are in same package)

[Campbell Ritchie]

Do you mean pass them as method arguments or as constructor arguments?

[Knute Snortum]

Your question is too vague for us to answer.  Can you expand on your question?  What's the situation where you need this ability?

[Swapnil Sanghai]

Please find below detailed description,
I have created two classes say Class ABC and Class XYZ.

Both the classes are from same package say Package Sample.

I have created object of Class ABC in that class itself and now I want to use/pass recently created object reference of the Class ABC to Class XYZ.

Please let me know all possible ways.

Also please let me know if you need more detailed description on this.

[Swapnil Sanghai]

Campbell Ritchie wrote:Do you mean pass them as method arguments or as constructor arguments?

Yes somewhat like that but not as method arguments or constructor arguments. I should be able to access reference of the object created in multiple classes but initialization will be done once.

[Paul Clapham]

Swapnil Sanghai wrote:

Campbell Ritchie wrote:Do you mean pass them as method arguments or as constructor arguments?

Yes somewhat like that but not as method arguments or constructor arguments. I should be able to access reference of the object created in multiple classes but initialization will be done once.

Then I don't understand why a constructor argument wouldn't work.

public class Target {
  // code for this class
}

public class User {
  Target myTarget;
  public User(Target theTarget) {
    myTarget = theTarget;
  }
  // code for this class which might use the reference to a Target object
}

public class Controller {
  // including this code to connect the two classes
  Target target = new Target();
  User user = new User(target);
}

[Swapnil Sanghai]

@ Paul Clapham - Apart from this I wanted to know other way to handle this situation.

[Campbell Ritchie]

Ramesh Chathuranga wrote:. . . . A is your main class and B is your miner class

Don't call classes minor; the second class contains the real code, so there is nothing minor about it.

. . . . you must make constructer, getter, setter, methods in class B. . . . .

Agree you need a constructor and methods, but I am not convinced that all classes need setter methods.

[Knute Snortum]

@OP: It's really hard to give examples without knowing how you're going to use the object, but here's the shell of a class that you could use to get a database connection object that must be initialized only once:

import java.sql.Connection;

public class DbConnection {
	private static Connection con;
	
	public static Connection getConnection() {
		if (con == null) {
			// Here you would initialize con 
		}
		
		return con;
	}
}

You would use the class like this: Connection con = DbConnection.getConnection(); The first time you call this it will go through the initialization of the con object.  Subsequent times it would just return the initialized object.

[Paul Clapham]

Swapnil Sanghai wrote:@ Paul Clapham - Apart from this I wanted to know other way to handle this situation.

Okay, you could also use a setter method in the User class and pass the Target reference in that way. I will leave you to modify my example to do that.

[Swapnil Sanghai]

Paul Clapham wrote:

Swapnil Sanghai wrote:@ Paul Clapham - Apart from this I wanted to know other way to handle this situation.

Okay, you could also use a setter method in the User class and pass the Target reference in that way. I will leave you to modify my example to do that.

Thanks Paul.