How can i control user to input number to the JTextField only?

i want to control user to input the number only in the JTextField
how can i do it?

Add an actionListener to the textfield and then when someone enters a key into the textfield check and see if it is a number, if it is not send an alarm and remove it.

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Hi Guru's,
I am facing one problem in Variables in BPS.
I am calculating days from Month/year .I have one variable it is for Days,Second variable it is for Month/Year.
First variable is user exist (for calculating the days),Second varible is user defined variable(this is a Input to the first variable).
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Here is the my sample code..
seq = '0000'.
ind = 0.
   i_area = 'ZTEST1'.
   area_var = 'ZVar2'.
PERFORM instantiate_object USING    i_area
                                    area_var
                             CHANGING lsr_var.
PERFORM get_current_value_of_variable
                        USING lsr_var
                        CHANGING lto_value.
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below bracket code calculating the leap year
( IF iv_date+4(2) = lc_feb.
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ELSE.
below bracket code calculating the days
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ENDIF.
data: st_date(2) type c.
st_date = '01'.
ind = 0.
ind = ind + 1.
here i am passing the low value and high value.
yto_charsel-chanm = '0CALDAY'.
yto_charsel-seqno = 1.
yto_charsel-sign = 'I'.
yto_charsel-opt   = 'EQ'.
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yto_charsel-chanm = '0CALDAY'.
yto_charsel-seqno = 1.
yto_charsel-sign = 'I'.
yto_charsel-opt   = 'BT'.
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How can i pass user input value to read this exist ,some where again i have to write code or else??
This is very urgent can you help me..

Hi,
Instead of two perform statements, use single perform.
PERFORM get_value USING i_area
                          i_variable
                     CHANGING lw_varsel.
Take the values from lw_varsel-low.
FORM statement for this perform is as follows.
DATA: li_varsel TYPE STANDARD TABLE OF upc_ys_api_varsel,
        lv_varsel TYPE REF TO cl_sem_variable.
FORM get_value USING p_area TYPE upc_y_area
                       p_variable TYPE upc_y_variable
                 CHANGING
                       p_lw_varsel TYPE upc_ys_api_varsel.
    CALL METHOD cl_sem_variable=>get_instance
      EXPORTING
        i_area       = p_area
        i_variable   = p_variable
         I_CREATE     =
      RECEIVING
        rr_variable = lv_varsel.
       EXCEPTIONS
         NOT_EXISTING = 1
         others       = 2
    IF sy-subrc <> 0.
      EXIT.
    ENDIF.
    REFRESH li_varsel.
****Getting the Value*********
    CALL METHOD lv_varsel->get_value
      EXPORTING
        i_user     = sy-uname
        i_restrict = 'X'
      RECEIVING
        rto_value = li_varsel.
    CLEAR : p_lw_varsel.
    READ TABLE li_varsel INTO p_lw_varsel INDEX 1.
    IF sy-subrc <> 0.
      EXIT.
    ENDIF.
ENDFORM.                    "get_value
Try this code.
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How can i control user to input number to the JTextField only?

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