How to check a string is contains numberic digits only ??

Can anyone tell me what methods I should use and how to use ??
It is because the string may contains char. or symbol, but I only want the string contains numberic only. (It means the wrong string can be convert into integer)
Thank you in advance !!

Well I guess you could always do like this:
boolean digitsOnly = false;
try {
Integer.parseInt(yourString);
digitsOnly = true;
}catch(Exception e) {
System.out.println("The string isn't a integer value");
if (digitsOnly) {
}

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Dear oracle Experts.
Im using the following oracle database.
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thank you.
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2
3    p_msg_in clob := '<DATA>
4 <FLD FNR="ZZ0584" DTE="26SEP12" SRC="DXB" DES="DAC" />
5 <AAA LBP="22334455" ETK="1234567/4" ACT="123" />
6 <AAA LBP="223344" ETK="2345678/1" />
7 <AAA LBP="223344" ETK="123456/1" ACT="345" />
8 </DATA>';
9
10    v_msg_xml xmltype;
11
12    v_1       varchar2(30);
13    v_4       date;
14    v_5       varchar2(30);
15    v_6       varchar2(30);
16    v_7       varchar2(30);
17    v_8       varchar2(30);
18
19 BEGIN
20
21    v_msg_xml := xmltype(p_msg_in);
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23    select fnr, to_date(dte, 'DDMONRR'), src, des
24    into v_1, v_4, v_5, v_6
25    from xmltable('/DATA/FLD'
26           passing v_msg_xml
27           columns fnr varchar2(30) path '@FNR'
28                 , dte varchar2(30) path '@DTE'
29                 , src varchar2(30) path '@SRC'
30                 , des varchar2(30) path '@DES'
31         ) ;
32
33     dbms_output.put_line('V1 = '||v_1);
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35     dbms_output.put_line('V5 = '||v_5);
36     dbms_output.put_line('V6 = '||v_6);
37
38     for r in (
39       select lbp, etk
40       from xmltable('/DATA/AAA[@ACT]'
41              passing v_msg_xml
42              columns lbp varchar2(30) path '@LBP'
43                    , etk varchar2(30) path '@ETK'
44            )
45     )
46     loop
47       dbms_output.put_line('LBP = '||r.lbp||' ETK = '||r.etk);
48     end loop;
49
50 END;
51 /
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u cant use ln_UID like that in IN. when you do that it checks for SUP.USAGE_PROFILE_ID = '21,24'
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