java 文本模板匹配 java文本对齐

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class Main {
public static void main(String[] args) {
final JTextField tf = new JTextField("press ", 20);
tf.setHorizontalAlignment(JTextField.RIGHT);
tf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int old = tf.getHorizontalAlignment();
if (old == JTextField.LEFT)
tf.setHorizontalAlignment(JTextField.RIGHT);
if (old == JTextField.RIGHT)
tf.setHorizontalAlignment(JTextField.CENTER);
if (old == JTextField.CENTER)
tf.setHorizontalAlignment(JTextField.LEFT);
}
});
JFrame frame = new JFrame("JTextFieldExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new java.awt.FlowLayout());
frame.getContentPane().add(tf);
frame.setSize(275, 75);
frame.setVisible(true);
tf.requestFocus();
}
}