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POhow to remove an array of elements in a list in java?
 

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  1. POhow to remove an array of elements in a list in java?
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    <p>Here is my codings:</p> <pre><code>package Controls; // Other code protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.getWriter().write("&lt;h5 class='searchResultFramePara'&gt;Assigned roles&lt;/h5&gt;"); String[] Removelist = request.getParameterValues("deleterolelist"); //String[] Removelist=removelist.split(","); //System.out.println(Removelist); String username = request.getParameter("name"); //System.out.println(username); List&lt;String&gt; Removelist1 = new ArrayList&lt;String&gt;(); Connection Con = null; Statement st = null; ResultSet rs; int rs1; try { Con = LoginSrv1.getConnection(); st = Con.createStatement(); String roles_query = "SELECT ROLE_NAME FROM demo.ZMM_USER_GROUP WHERE USER_NAME = '" + username + "';"; rs = st.executeQuery(roles_query); while (rs.next()) { String assigned_role = rs.getString("ROLE_NAME"); String[] assigned_array = assigned_role.split(","); if (assigned_array != null) { for (int i = 0; i &lt; assigned_array.length; i++) { Removelist1.add(assigned_array[i]); } } } for (int j = 0; j &lt; Removelist.length; j++) { if (Removelist1.contains(Removelist[j])) { Removelist1.remove(Removelist[j]); } } System.out.println(Removelist1); StringBuilder b = new StringBuilder(); for (String text1 : Removelist1) { b.append(text1).append(","); } String Roletext = b.toString().replaceAll(",$", ""); System.out.println(Roletext); String update_query = "UPDATE DEMO.ZMM_USER_GROUP SET ROLE_NAME='" + Roletext + "' WHERE USER_NAME = '" + username + "';"; rs1 = st.executeUpdate(update_query); String assignedrole_query = "SELECT ROLE_NAME FROM demo.ZMM_USER_GROUP WHERE USER_NAME = '" + username + "';"; rs = st.executeQuery(assignedrole_query); while (rs.next()) { String rolename = rs.getString("ROLE_NAME"); String[] sarr = rolename.split(","); for (int i = 0; i &lt; sarr.length; i++) { //System.out.println("array"+i+sarr[i]); response.getWriter().write("&lt;a href='javascript:void(0);' id=" + sarr[i] + " class='availalbe' onclick='removelist(\"" + sarr[i] + "\");'&gt;" + sarr[i] + "&lt;/a&gt;&lt;br&gt;"); } } } catch (Exception e) { System.out.println(e); } } </code></pre> <p>here i get the Removelist array and rolename as a request from ajax. now i remove the removelist in Removelist1 list. for example i send Removelist having one string value "initiator",then it will remove. But for example it contains "initiator","productionmanager",(i.e., the array contains more than one value),then it will not remove it.pls help me.</p>
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    1. USAbhinavRanjan
    1. USuser3016102
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    1. COThere's a lot of code here, you will get more help if you post a Short, Self Contained, Correct (Compilable), Example - http://sscce.org/
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      1. USSimonC
    2. COIf i get you correctly, you mean you have collection of some data that needs to removed in some other(Removelist) collection. If this is the case you can use removeAll() of ArrayList.
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      1. USguptakvgaurav
    3. COWhat does "will not remove" mean? Does remove() throw an exception, or return false, what?
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      1. USEd Staub
 

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