How To - Creating A Textbox ( jTextbox) Validation Class In Java

This class was developed to be used in a java windows form application to validated jtextboxes easily.

1. Add the class to project
2. Create an object
3. use appropriate method with your parameters

eg;-

AutoValidation validation =new AutoValidation();

validation.ValidationCheck(CustomerId, true,0,'@');

so here CustomerID is jTextbox and true is to check if it's empty and 0 means no length check and @ is a special character so you can input number and alphabetic.

Read class comments for more information

Download Source Code

	package MainSystem;
	/*
	This class is used to validate textboxes using jtextfield object. you can check isEmpty , lenth check and type check
	Author- Dinushka95@yahoo.com
	Contructor needs the text object then weather u want to check the is empty check then you have to enter a number from
	negative to postive number. for example negative -5 is less than five and 5 means grater than five and zero means no length check
	then the final check is type check it needs a char input if a number is input it will allow numbers only if letter is input then only letters
	to accept any input use special character
	*/
	import javax.mail.internet.AddressException;
	import javax.mail.internet.InternetAddress;
	import javax.swing.JOptionPane;
	import javax.swing.text.JTextComponent;
	public class AutoValidation {
	JTextComponent Textbox1;
	char TypeCheck1;
	public boolean ValidationCheck(JTextComponent Textbox,boolean IsEmptyCheck,int LenghtCheck,char TypeCheck){
	Textbox1=Textbox;
	TypeCheck1=TypeCheck;
	//Check if it is empty
	if(IsEmptyCheck){
	if(Textbox1.getText().equals("")){
	JOptionPane.showMessageDialog(null, Textbox1.getName()+" Empty textbox ", "InfoBox: " + "titleBar", JOptionPane.ERROR_MESSAGE);
	}
	else{
	//Lenght checking
	if(LenghtCheck<0){
	if(Textbox1.getText().length()>=Math.abs(LenghtCheck)){
	JOptionPane.showMessageDialog(null, Textbox1.getName()+" = textbox lenth error;should be < "+Math.abs(LenghtCheck), "InfoBox: " + "titleBar",JOptionPane.ERROR_MESSAGE);
	}
	else{
	if(typecheck()){return true;}
	}
	}
	else if (LenghtCheck>0){
	if(Textbox1.getText().length()<=Math.abs(LenghtCheck)){
	JOptionPane.showMessageDialog(null, Textbox1.getName()+" = textbox lenth error;should be > "+Math.abs(LenghtCheck), "InfoBox: " + "titleBar",JOptionPane.ERROR_MESSAGE);
	}
	else {
	if(typecheck()){return true;}
	}
	}else {
	if(typecheck()){return true;}
	}
	}
	}
	else {
	return true;
	}
	return false;
	}
	private boolean typecheck(){
	//Type check if it's a number
	if(Character.isDigit(TypeCheck1)){
	boolean l=false;
	String tem=Textbox1.getText();
	int count=0;
	while(count<tem.length()){
	if(Character.isDigit(tem.charAt(count))||Character.isWhitespace(tem.charAt(count))){
	// do nothing
	count++;
	}
	else{
	l=true;
	count++;
	}
	}
	if(l){
	JOptionPane.showMessageDialog(null, "type error- only digit= textbox "+Textbox1.getName(), "InfoBox: " + "titleBar",JOptionPane.ERROR_MESSAGE);
	return false;
	}
	}
	//Type check if it's a letter
	else if(Character.isAlphabetic(TypeCheck1)){
	boolean l=false;
	String tem=Textbox1.getText();
	int count=0;
	while(count<tem.length()){
	if(Character.isAlphabetic(tem.charAt(count))||Character.isWhitespace(tem.charAt(count))){
	// do nothing
	count++;
	}
	else{
	l=true;
	count++;
	}
	}
	if(l){
	JOptionPane.showMessageDialog(null, "type error- only alphabetic= textbox "+Textbox1.getName(), "InfoBox: " + "titleBar",JOptionPane.ERROR_MESSAGE);
	return false;
	}
	}
	else {
	//do nothing
	//accept any input
	}
	return true;
	}
	// This method is used to validate Email address
	public boolean isValidEmailAddress(String email) {
	boolean result = true;
	try {
	InternetAddress emailAddr = new InternetAddress(email);
	emailAddr.validate();
	} catch (AddressException ex) {
	JOptionPane.showMessageDialog(null, "Invalid E-mail", "InfoBox: " + "titleBar",JOptionPane.ERROR_MESSAGE);
	result = false;
	}
	return result;
	}
	}

view raw AutoValidation.java hosted with ❤ by GitHub