In the code sample below, the text is always right-justified, in spite of the
calls to JTextField.setScrollOffset(0) and JTextField.setHorizontalAlignment(JTextField.LEFT). This is true for all Swing
versions.

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

public class TestSetScrollOffset extends JFrame {
    JFrame frame;
    JTextField tf = new JTextField(10);
    public TestSetScrollOffset() {
        frame = this;
        Container c = getContentPane();
        c.setLayout(new FlowLayout());
        c.add(tf);
        JButton button = new JButton("Add Text");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                tf.setText("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
                tf.setScrollOffset(0);
                tf.setHorizontalAlignment(JTextField.LEFT);
                tf.invalidate();
                frame.validate();
        }});
        c.add(button);
        pack();
        setVisible(true);
    }

    public final static void main(String[] args) {
        new TestSetScrollOffset();
    }
}

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nick.rodin@eng 03-04-1999

Calling the JTextComponent method setCaretPosition(0) is an effective workaround.