how to use validation in java

can any one tell me how to use validation on a label or textfield in java.































































































































































































































































i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks

how to use validation in java

can any one tell me how to use validation on a label or textfield in java.































































































































i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks

how to use validation in java

can any one tell me how to use validation on a label or textfield in java.































































i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks

how to use validation in java

can any one tell me how to use validation on a label or textfield in java.































i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks

how to use validation in java

can any one tell me how to use validation on a label or textfield in java.















i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks

how to use validation in java

can any one tell me how to use validation on a label or textfield in java.







i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks

how to use validation in java

can any one tell me how to use validation on a label or textfield in java.



i have a textfield and i want that only username with @ sign will be taken by the program or gives an error.or a textfield that can only take numeric values or whatever the developer wants to take from user..

Thanks