how can the validation be done for a text field in java

how about parsing it as int, if it fails u know its not numeric
eg

try {
num = Integer.parseInt ( txtbox.getText());
} catch (NumberFormatException E) {
// value entered in txtbox is not numeric
}

deepthiyalamanchi, please close this question and distribute the points.
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how to perform validation on the textfield

public class Main {

/**
* This method checks if a String contains only numbers
*/
public boolean containsOnlyNumbers(String str) {

//It can't contain only numbers if it's null or empty...
if (str == null || str.length() == 0)
return false;

for (int i = 0; i < str.length(); i++) {

//If we find a non-digit character we return false.
if (!Character.isDigit(str.charAt(i)))
return false;
}

return true;
}


/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Main main = new Main();
System.out.println(main.containsOnlyNumbers("123456"));
System.out.println(main.containsOnlyNumbers("123abc456"));
}
}