Vertikal top alignment på JFrame & tilføjelse af JPanels

Den løser du bedst ved at bruge NullLayout eller GridBagLayout, her kan du se hvordan de virker.

Spørgsmål 2:
Lyder som om du mangler en add()/ setVisible()/ validate() eller lignende

public class LayoutTest extends javax.swing.JFrame {
    public LayoutTest() {
        initComponents();
    }
   
    private void initComponents() {
        gBL1 = new layout.GBL();
        nullL1 = new layout.NullL();

        getContentPane().setLayout(new java.awt.GridLayout());

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        gBL1.setBorder(javax.swing.BorderFactory.createEtchedBorder());
        getContentPane().add(gBL1);

        nullL1.setBorder(javax.swing.BorderFactory.createEtchedBorder());
        getContentPane().add(nullL1);

        pack();
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new LayoutTest().setVisible(true);
            }
        });
    }
    private layout.GBL gBL1;
    private layout.NullL nullL1;
}




// GridBagLayout

public class GBL extends javax.swing.JPanel {
    public GBL() {
        initComponents();
    }
   
                       
    private void initComponents() {
        java.awt.GridBagConstraints gridBagConstraints;

        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setLayout(new java.awt.GridBagLayout());

        jButton1.setText("jButton1");
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        add(jButton1, gridBagConstraints);

        jButton2.setText("jButton2");
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 1;
        gridBagConstraints.gridy = 0;
        add(jButton2, gridBagConstraints);

        jButton3.setText("jButton3");
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 1;
        gridBagConstraints.gridy = 1;
        add(jButton3, gridBagConstraints);

    }
               
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
}



// NullLayout

public class NullL extends javax.swing.JPanel {
    public NullL() {
        initComponents();
    }
                       
    private void initComponents() {
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setLayout(null);

        jButton1.setText("jButton1");
        add(jButton1);
        jButton1.setBounds(10, 10, 90, 23);

        jButton2.setText("jButton2");
        add(jButton2);
        jButton2.setBounds(110, 10, 100, 23);

        jButton3.setText("jButton3");
        add(jButton3);
        jButton3.setBounds(110, 40, 100, 23);

    }
                 
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
}