in this coding even backspace key and enter key should accept....

in this coding even backspace key and enter key should accept....plez help me and make changes to which it accept backspace and enter key ....plez plez plez its urgent:-(

char ch = evt.getKeyChar();
                    if(Character.isDigit(ch)){
                    }
                    else{
                        JOptionPane.showMessageDialog(null, "Only numbers are allowed!");
                        jTextField4.setText(" ");
                    }

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