Data fra anden klasse

Det burde kunne lade sig gøre uden problemer. Kan du ikke prøve at poste lidt kode, så fejlen kan identificeres?

Ok, her kommer lidt kode:
package software;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;

public class BrugerlogGUI extends JFrame {
  protected String[] input= new String[3];
  private static ResultSet results;
  private static Connection con=DbAdgang.getDbCon();
  JPanel contentPane;
  JLabel loginL = new JLabel();
  JLabel brugerL = new JLabel();
  JLabel passwordL = new JLabel();
  JTextField brugerTF = new JTextField();
  JPasswordField passwordTF = new JPasswordField();
  JButton loginB = new JButton();

  //Construct the frame
  public BrugerlogGUI() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  //Component initialization
  private void jbInit() throws Exception {
    contentPane = (JPanel)this.getContentPane();
    loginL.setFont(new java.awt.Font("Dialog", 1, 24));
    loginL.setText("Login");
    loginL.setBounds(new Rectangle(16, 16, 81, 38));
    contentPane.setLayout(null);
    this.setResizable(false);
    this.setSize(new Dimension(292, 205));
    this.setTitle("Brugerlogin");
    brugerL.setFont(new java.awt.Font("Dialog", 0, 12));
    brugerL.setText("Brugernavn:");
    brugerL.setBounds(new Rectangle(16, 79, 71, 23));
    passwordL.setBounds(new Rectangle(16, 103, 71, 23));
    passwordL.setText("Password:");
    passwordL.setFont(new java.awt.Font("Dialog", 0, 12));
    brugerTF.setText("");
    brugerTF.setBounds(new Rectangle(92, 81, 122, 18));
    passwordTF.setText("");
    passwordTF.setBounds(new Rectangle(92, 105, 122, 18));
   
    loginB.setBounds(new Rectangle(101, 130, 93, 23));
    loginB.setText("Login");
    loginB.addActionListener(new Brugerlog_loginB_actionAdapter(this));
    contentPane.add(loginL, null);
    contentPane.add(brugerL, null);
    contentPane.add(passwordL, null);
    contentPane.add(passwordTF, null);
    contentPane.add(brugerTF, null);
    contentPane.add(loginB, null);
  }

  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
  void loginB_actionPerformed(ActionEvent e) {
        String query="select Brugernavn,Password,Adminret from Brugere where Brugernavn ='"+brugerTF.getText()+"'";
        try{
          Statement stmt = con.createStatement();
          results = stmt.executeQuery(query);
          while(results.next())
          {
            input[0]=(results.getString("Brugernavn")); //Kolonnenavn hvorfra data hentes.
            input[1]=(results.getString("Password"));
            input[2]=(results.getString("Adminret"));
          }
          if (input[0].equals(brugerTF.getText()) && input[1].equals(passwordTF.getText()))
          {
            MenuGUI m = new MenuGUI();
            this.hide();
          }
          else
          {
              JOptionPane.showMessageDialog(null,"Forkert brugernavn eller password","Forkert Login",JOptionPane.INFORMATION_MESSAGE);
          }
        }catch (Exception f)
        {JOptionPane.showMessageDialog(null,"Forkert brugernavn eller password","Forkert Login",JOptionPane.INFORMATION_MESSAGE);
        }
    }
}

class Brugerlog_loginB_actionAdapter implements java.awt.event.ActionListener {
  BrugerlogGUI adaptee;

  Brugerlog_loginB_actionAdapter(BrugerlogGUI adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.loginB_actionPerformed(e);
  }
}
_____________________________________________________________
package software;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class MenuGUI extends JFrame {
  JLabel menuL = new JLabel();
  JButton lagerB = new JButton();
  JButton kunderB = new JButton();
  JButton jButton3 = new JButton();
  JButton jButton4 = new JButton();
  JButton jButton5 = new JButton();
  BrugerlogGUI b = new BrugerlogGUI();
  JButton adminL = new JButton();

  public MenuGUI() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  void jbInit() throws Exception {
    menuL.setFont(new java.awt.Font("Dialog", 1, 24));
    menuL.setRequestFocusEnabled(true);
    menuL.setText("Menu");
    menuL.setBounds(new Rectangle(236, 14, 79, 38));
    this.getContentPane().setLayout(null);
    this.setSize(550, 300);
    lagerB.setBounds(new Rectangle(25, 78, 175, 28));
    lagerB.setFont(new java.awt.Font("Dialog", 0, 12));
    lagerB.setText("Lager");
    kunderB.setText("Kunder");
    kunderB.setBounds(new Rectangle(25, 116, 175, 28));
    kunderB.setFont(new java.awt.Font("Dialog", 0, 12));
    jButton3.setText("jButton1");
    jButton3.setBounds(new Rectangle(25, 154, 175, 28));
    jButton3.setFont(new java.awt.Font("Dialog", 0, 12));
    jButton4.setText("jButton1");
    jButton4.setBounds(new Rectangle(25, 191, 175, 28));
    jButton4.setFont(new java.awt.Font("Dialog", 0, 12));
    jButton5.setText("jButton1");
    jButton5.setBounds(new Rectangle(25, 229, 175, 28));
    System.out.println(b.input[1]);
//    if (b.input[2] == "1") {

  //  }
    this.setResizable(false);
    this.setTitle("Menu");
    adminL.setText("Administrationsværktøjer");
    adminL.addActionListener(new MenuGUI_adminL_actionAdapter(this));
    adminL.setBounds(new Rectangle(298, 77, 175, 28));
    adminL.setFont(new java.awt.Font("Dialog", 0, 12));
    this.getContentPane().add(menuL, null);
    this.getContentPane().add(lagerB, null);
    this.getContentPane().add(kunderB, null);
    this.getContentPane().add(jButton3, null);
    this.getContentPane().add(jButton4, null);
    this.getContentPane().add(jButton5, null);
    this.getContentPane().add(adminL, null);

    //placer skærmbilledet midt på skærmen
    Dimension scr = Toolkit.getDefaultToolkit().getScreenSize();
    setLocation( (scr.width - getWidth()) / 2, (scr.height - getHeight()) / 2);
    show();
  }

  void adminL_actionPerformed(ActionEvent e) {
AdminGUI a = new AdminGUI();
    a.show();
    this.hide();
  }
}
class Menu_this_windowAdapter extends java.awt.event.WindowAdapter {
  Menu adaptee;

  Menu_this_windowAdapter(Menu adaptee) {
    this.adaptee = adaptee;
  }
}

class MenuGUI_adminL_actionAdapter implements java.awt.event.ActionListener {
  MenuGUI adaptee;

  MenuGUI_adminL_actionAdapter(MenuGUI adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.adminL_actionPerformed(e);
  }
}

Ofte vil man i den slags situationer kalde klasse 2's constructor med
en referance til en instans af klasse 1, hvis constructoren gemmer
den referance i en instans variabel, så kan alle metoder i klasse 2
få adgang til alle public metoder i klasse 1 inkl. get/set af data-

Hej Arne_v,
Hvis jeg gør det, får jeg så en korrekt objektorienteret klasse? Gider du evt. give et kodeeksempel?

Ja

5 minutter

A.java:

public class A {
  private int v;
  public int getV() {
      return v;
  }
  public void setV(int v) {
      this.v = v;
  }
}

B.java:

public class B {
  private A a;
  public B(A a) {
      this.a = a;
  }
  public void x() {
      a.setV(a.getV() + 10);
  }
}

i noget kode:

A a = new A();
B b = new B(a);
b.x();

if (b.input[2] == "1") {

    }
- du skal nok nærmere lave en bruger klasse, som bruges i stedet for dit array:

class User
{
    private String name, password;
    private boolean isAdmin;
    User( String name, String password, boolean isAdmin )
    {
        this.name = name;
        //....
    }
    public boolean isAdmin()
    {
      return isAdmin;
    }
    //...
}

og konstruere den:
User user = new User( ..., results.getString("Adminret").equals("1") )

og sende den med til din MenuGUI:
MenuGUI m = new MenuGUI( user );

og checke admin rettigheder:

if( user.isAdmin() )
{
  //... 
}

Har fået det til at virke nu.
Jeg konverterede array[2] til en streng, som jeg førte med over i klasse 2, hvor jeg tog en global variabel og sat den lige med strengen, som jeg så kunne detektere på.
___________
public MenuGUI(String bruger) {
    try {
      admin=bruger;
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }

  }

lukker