How can I pass a value from one frame to another

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Java

Here i have a login form includes username and password

and i have another form which can records customer data and there are few text boxes to fill.
like customer name;
customer email and customer contact.

the basically what happens is when user get a call from a customer.
user put his or her user name and password, login to the system.
and user has to fill textboxes and after submit it, data saves in a mysql database.

so mysql has a database called customer.
it has five cloumns
cus id,cusName,cusAdress,cusContact,contactUser

So i have created a class called MysqlConnect which holds all setters and getters.
so i have created a getter and setter called setName and getName

public class MysqlConnect {
        
    String Name;
public void setName(String newName){
    Name = newName;
    }
    
    public String getName(){
    return Name;
    }

}

then i set a value in the login form

nameSet = uName.getText();//gets the username from a textbox
        MysqlConnect cont = new MysqlConnect();
        cont.setName(nameSet);

after that i have implement a getter in the other form call customer data.

MysqlConnect cont = new MysqlConnect();
       String namet = cont.getName();
       JOptionPane.showMessageDialog(null, "Data Saved Successfully."+nameUser+"");

But it shows a null value.

What I have tried:

Getters and Setters as i Described?