Source Code : Apply special filter to a JTextField

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Apply special filter to a JTextField

   

import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

class JTextFieldFilter extends PlainDocument {
  public static final String NUMERIC = "0123456789";

  protected String acceptedChars = null;

  protected boolean negativeAccepted = false;

  public JTextFieldFilter() {
    this(NUMERIC);
  }

  public JTextFieldFilter(String acceptedchars) {
    acceptedChars = acceptedchars;
  }

  public void setNegativeAccepted(boolean negativeaccepted) {
    if (acceptedChars.equals(NUMERIC)) {
      negativeAccepted = negativeaccepted;
      acceptedChars += "-";
    }
  }

  public void insertString(int offset, String str, AttributeSet attr) throws BadLocationException {
    if (str == null)
      return;

    for (int i = 0; i < str.length(); i++) {
      if (acceptedChars.indexOf(str.valueOf(str.charAt(i))) == -1)
        return;
    }

    if (negativeAccepted && str.indexOf("-") != -1) {
      if (str.indexOf("-") != 0 || offset != 0) {
        return;
      }
    }

    super.insertString(offset, str, attr);
  }
}

public class Main extends JFrame{

  public static void main(String[] argv) throws Exception {
    new Main();
  }

  public Main() {
    JTextField tf1, tf1b, tf1c, tf2, tf3;
    JLabel l1, l1b, l1c, l2, l3;

    setLayout(new FlowLayout());
    //
    l1 = new JLabel("only numerics");
    tf1 = new JTextField(10);
    getContentPane().add(l1);
    getContentPane().add(tf1);
    tf1.setDocument(new JTextFieldFilter(JTextFieldFilter.NUMERIC));
    setSize(300,300);
    setVisible(true);
  }
}

   
    
    
  

Thank with us