ScrollPane: Viewport setzen

// ScrollPaneApplet.java


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




public class ScrollPaneApplet extends JApplet {


    private JPanel jContentPane = null;
    private JScrollPane jScrollPane = null;
    private ScrollPanePanel jScrollPaneViewport = null;


    public ScrollPaneApplet() { super(); }

    public void init() {
        this.setSize(600, 400);
        this.setContentPane(getJContentPane());
    }


    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jContentPane = new JPanel();
            jContentPane.setLayout(null);
            jContentPane.setSize(new Dimension(600, 400));
            jContentPane.setPreferredSize(new Dimension(600, 400));
            jContentPane.add(getJScrollPane(), null);
        }
        return jContentPane;
    }

    private JScrollPane getJScrollPane() {
        if (jScrollPane == null) {
            jScrollPane = new JScrollPane();
            jScrollPane.setSize(new Dimension(400, 300));
            jScrollPane.setPreferredSize(new Dimension(400, 300));
            jScrollPane.setBounds(new Rectangle(33, 28, 400, 300));
            jScrollPane.setLocation(new Point(33,28));
            jScrollPane.setBorder(BorderFactory.createLineBorder(Color.red, 1));
            jScrollPane.setViewportView(jScrollPaneViewport);

        }
        return jScrollPane;
    }
}

// ScrollPaneDialog.java


import javax.swing.*;
import java.awt.*;
import javax.swing.BorderFactory;
import java.awt.Color;


public class ScrollPaneDialog extends JDialog {


    private JPanel jContentPane = null;
    private JScrollPane jScrollPane = null;
    private ScrollPanePanel jScrollPaneViewport = null;


    public ScrollPaneDialog() {
        super();
        initialize();
    }


    private void initialize() {
        this.setSize(new java.awt.Dimension(600, 400));
        this.setPreferredSize(new java.awt.Dimension(600, 400));
        this.setContentPane(getJContentPane());
    }


    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jContentPane = new JPanel();
            jContentPane.setLayout(null);
            jContentPane.setSize(new Dimension(600, 400));
            jContentPane.setPreferredSize(new Dimension(600, 400));
            jContentPane.add(getJScrollPane(), null);
        }
        return jContentPane;
    }

    private JScrollPane getJScrollPane() {
        if (jScrollPane == null) {
            jScrollPane = new JScrollPane();
            jScrollPane.setSize(new Dimension(400, 300));
            jScrollPane.setPreferredSize(new Dimension(400, 300));
            jScrollPane.setLocation(new Point(30, 30));
            jScrollPane.setBorder(BorderFactory.createLineBorder(Color.red, 1));
            jScrollPane.setViewportView(jScrollPaneViewport);
        }
        return jScrollPane;
    }

    public static void main(String[] args) {

        ScrollPaneDialog spd = new ScrollPaneDialog();
        spd.setVisible(true);
    }
}

// ScrollPanePanel.java


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


public class ScrollPanePanel extends JPanel {


    private JButton jButton = null;
    private JButton jButton1 = null;


    public ScrollPanePanel() {
        super();
        initialize();
    }


    private void initialize() {
        this.setLayout(null);
        this.setSize(new Dimension(1200, 800));
        this.setPreferredSize(new Dimension(1200, 800));
        this.add(getJButton(), null);
        this.add(getJButton1(), null);
    }

    private JButton getJButton() {
        if (jButton == null) {
            jButton = new JButton();
            jButton.setBounds(new Rectangle(52, 115, 83, 53));
            jButton.setText("1");
        }
        return jButton;
    }


    private JButton getJButton1() {
        if (jButton1 == null) {
            jButton1 = new JButton();
            jButton1.setBounds(new Rectangle(894, 605, 106, 46));
            jButton1.setText("2");
        }
        return jButton1;
    }
}