How Can I Sort JTable With A Button?

Example:

I made a table, and I want a search box for each column. I hid the column titles with this code:

table.setTableHeader(null);

And put a textField and Button to each top of columns. Now I can search for each different column, but I can't sort the items.

I want to sort the column items when I click the top button. I tried some thing but it is so complex for a beginner as me.

Is there any way to do it? Or all the thing i tried useless and there is much easy way to do it? I hope explained it right.

Note :
I have found this code.I dont even know if it does what i need. I did try it but getting error.

/** Default sort behaviour, plus every third click removes the sort. */
  private final class CustomSorter extends MouseAdapter {
    @Override public void mouseClicked(MouseEvent aEvent) {
      int columnIdx = fTable.getColumnModel().getColumnIndexAtX(aEvent.getX());
      //build a list of sort keys for this column, and pass it to the sorter
      //you can build the list to fit your needs here 
      //for example, you can sort on multiple columns, not just one
      List<RowSorter.SortKey> sortKeys = new ArrayList<>();
      //cycle through all orders; sort is removed every 3rd click
      SortOrder order =  SortOrder.values()[fCountClicks % 3];
      sortKeys.add(new RowSorter.SortKey(columnIdx, order));
      fSorter.setSortKeys(sortKeys);
      ++fCountClicks;
    }
    private int fCountClicks;
  }
} 

And did try this and getting same error.

btnNewButton.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				table.getRowSorter().toggleSortOrder(1);
			}
		});

Error:Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

This is the code: Code

This is the what program looks like : Picture

In the ActionListener of your JButton you can try sorting the column with code like:

table.getRowSorter().toggleSortOrder(columnIndex);

This should allow you to click the button to reverse the sort order each time it is clicked.

Edit:

As I said in my comment you need to learn how to solve a NullPointerException.

The stack trace when I run the code states:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at frame1$2.actionPerformed(frame1.java:83)

Line 83 is:

table.getRowSorter().toggleSortOrder(0);

So you have two variables at that statement:

1. table
2. table.getRowSorter()

It is up to you to determine which variable is null

So you add debug code before that statement:

System.out.println( table );
System.out.println( table.getRowSorter() );

If you do you will see that table.getRowSorter() returns null.

So now you can ask a proper question like:

"Why does table.getRowSorter() return null?"

The answer is simple you didn't set the properties of the table to do sorting.

This is easily done by adding:

table.setModel(model);
table.setAutoCreateRowSorter(true); // added

In the future do some basic debugging BEFORE asking a question. You can't code if you don't know the basics of debugging code.

My original answered assumed you new how to sort columns in a table when using the table header and you just wanted to know how to use a separate button. That is why a "MRE" should be posted with EVERY question so we don't have to guess what your code is really doing.