如何从另一个类中获取字符串？

Question

Searched everywhere trying to find how to do this. I want to get a string from one class that i set the variable before going into the second class and allow me to use it as a string in this class.

Basically there's a String called LastName that i want to use in another class.

Here's my code if needed.

First Login Class:

import java.util.Scanner;

public class Login {
public void LoginScreen() {

    Agent AgentObject = new Agent();
    Citizen CitizenObject = new Citizen();

    String FirstName;
    String LastName;

    Scanner input = new Scanner(System.in);

    System.out.println("Welcome!");
    System.out.print("Please Enter Last Name: ");
    LastName = input.next();
    System.out.print("Please Enter First Name: ");
    FirstName = input.next();
    System.out.println("Hello " + FirstName + " " + LastName);

    System.out.print("Enter Password: ");
    String userinput = input.next();
    if (userinput.equals("Timmo")) {
        AgentObject.WelcomeAgent();
    } else {
        CitizenObject.WelcomeCitizen();
    }

}
}

Second Agent Class:

public class Agent {
public void WelcomeAgent() {
    Welcome WelcomeObject = new Welcome();
    Login LoginObject = new Login();

    System.out.println("Access Granted");
    System.out.print("Loading Data  ");
    int progress = 0;
    while (progress <= 100) {
        System.out.print(progress + " ");
        progress++;
    }
    System.out.println("    Data Loaded");

    System.out.println("Welcome Agent " + LastName);
    LoginObject.LoginScreen();
}
}

Any help is incredibly appreciated. Thanks

Answer 1

I can see you are probably quite new to Java - so you may be lacking a few fundamentals.

Probably best to just pass the string in as a parameter to the method in your case eg

public void WelcomeAgent(String lastName) {

and when you call the method, send that value in eg

AgentObject.WelcomeAgent(userinput);    

Btw, a few convention tips. Variables and functions should start with a lower case . eg

String lastName;

and

Citizen citizen = new Citizen();

Answer 2

Do you want to access the value of LastName in class Agent ?

What if you change it like this

public class Login {

 String FirstName, LastName;



public void LoginScreen() {

Agent AgentObject = new Agent();
Citizen CitizenObject = new Citizen();
....
LastName = input.next();
 ...
 }

 public String getLastName()
 { return LastName; }

and in class Agent

you can use LoginObject.getLastName() to get the it.

Answer 3

Write a getter method for the lastName in your Login class. After setting the value in the Login class send the reference of this class object to the other classes where you want to use. Finally call the onject.getLastName() method and use it.

Example:

Suppose Login class and Agent class and lastName was declared in Login class then pass the reference of the Login class to the Agent class and access it from the Agent class using the getter method as I have stated above.