java - JTable Clickable Header in swing -


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hello have hard time solving puzzle. professor gave code , told change make column head clickable.can change me.? wasted 4 hours :( not great in java swings below code... below code :

package academic.emailclient.view;  import java.awt.color; import java.awt.dimension; import java.awt.font; import java.util.arraylist; import java.util.date; import java.util.vector; import javax.swing.*; import javax.swing.table.*; import academic.emailclient.model.message; import academic.emailclient.view.entities.messageview;  public class mailbox extends jframe {   jtable tableinbox;   private final int mailbox_frame_width = 1080;   private final int mailbox_frame_height = 650;   static final boolean visible = true;  public mailbox() {     object[] columnnamesinbox = { "boolean", "sender", "subject", "body" };     object[][] datainbox = {             { false, "5@gmail.com", "d", "t" },             { false, "r@gmail.com", "projhsdject work", "i " },             { false, "r.@ymail.com", "job placement","iut that" },             { true, "yam@gmail.com", "s1", "as" }             };      defaulttablemodel modelinbox = new defaulttablemodel(datainbox,             columnnamesinbox);     tableinbox = new jtable(modelinbox) {          @override         public class getcolumnclass(int columninbox) {             switch (columninbox) {             case 0:                 return boolean.class;             case 1:                 return string.class;             case 2:                 return string.class;             case 3:                 return string.class;             default:                 return boolean.class;             }         }     };         tableinbox.setbackground(color.lightgray);     tableinbox.setgridcolor(new color(0,128,0));     jtableheader inboxheader = tableinbox.gettableheader();     inboxheader.setbackground(color.dark_gray);     inboxheader.setforeground(color.white);  }   public int getmesssagescount(int i) {     return 0; }  public int getcheckeditemsnumber(int i) {     return 0; }  public object[][] getcheckeditems() {      return getcheckeditems(); }  public object[][] getmail() {     return getmail(); }  public object[][] orderbydate() {      return orderbydate(); }  public object[][] orderbysender() {     return orderbysender(); }  public object[][] orderbysubject() {     return orderbysubject(); }  public jtable getmailbox() {     return tableinbox; }   public void run() {      jframe mailboxframe = new jframe();      mailboxframe.setmaximumsize(new dimension(mailbox_frame_width, mailbox_frame_height));     mailboxframe.setpreferredsize(new dimension(mailbox_frame_width, mailbox_frame_height));     mailboxframe.setbounds(0, 0, mailbox_frame_width, mailbox_frame_height);     mailboxframe.setvisible(visible);     mailboxframe.setdefaultcloseoperation(jframe.exit_on_close); }  }

professor gave code , told change make column head clickable

see jtable.setautocreaterowsorter(true). e.g. might see after clicking cat. column header. small upwards pointing arrow indicates table sorted on column.

clickable table header


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