java中textField输入字符类型，长度的限制

package www;import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;public class shiyan { private JTextField textField;
public shiyan(){
JFrame f=new JFrame();
f.getContentPane().setLayout(null);
f.setSize(500, 328); final JLabel label = new JLabel();
label.setText("输入数字：");
label.setBounds(54, 93, 74, 33);
f.getContentPane().add(label); textField = new JTextField();
textField.setBounds(161, 98, 170, 33);
f.getContentPane().add(textField);

f.setVisible(true);

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

}
这是代码，希望各位大虾补充下，限制只能输入数字，限制长度为5

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.text.MaskFormatter;
import javax.swing.JFormattedTextField;public class shiyan { private MaskFormatter mf;
private JFormattedTextField textField; public shiyan(){
JFrame f = new JFrame();
f.getContentPane().setLayout(null);
f.setSize(500, 328); final JLabel label = new JLabel();
label.setText("输入数字：");
label.setBounds(54, 93, 74, 33);
f.getContentPane().add(label);

try {
mf = new MaskFormatter("#####");
} catch (Exception e) {
}

textField = new JFormattedTextField(mf);
textField.setBounds(161, 98, 170, 33);

f.getContentPane().add(textField);

f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
f.setVisible(true);
}
public static void main(String[] args) {
new shiyan();
}
}

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