ADF Basics: Reorder ADF table column using DisplayIndex property

This post is about a very simple use case that is reordering of af:table column at run time. 

Ordering of columns in af:table is controlled by DisplayIndex property of af:column
Check what docs says-

Default Value: -1

The display order index of the column. Columns can be re-arranged and they are displayed in the table based on the displayIndex. Columns are sorted based on the displayIndex property, columns without displayIndex are displayed at the end, in the order in which they appear. The displayIndex attribute is honored only for top level columns, since it is not possible to rearrange a child column outside of the parent column.
Not supported on the following renderkits: org.apache.myfaces.trinidad.core

We can set DisplayIndex property for all columns in a sequence (1,2,3 etc) that we want to see on page

Allow user input in Jdeveloper for Java applications, Using Java Scanner Class to take input from console

Sometimes we have to take input from Keyboard when we use Scanner or BufferedReader class.
and to take input from Jdeveloper we have to change a setting to allow user input in Jdeveloper.

Let's take an example of java.util.Scanner class-

package client;

import java.util.Scanner;

public class UserInput {
    public UserInput() {
        super();
    }

    public static void main(String[] args) {
        System.out.println("Please Enter your Name-");
        Scanner sc = new Scanner(System.in);
        String name = sc.next();
        System.out.println("Your Name is " + name);
    }

}

Using popupFetchListener to execute method on popup launch in Oracle ADF

Everyone must have used ADF Faces popup component , this is one of most used container to show information on top of page
In this post i am talking about popup fetch event suppose we have to perform some operation before opening popup like filtering data inside popup . We can do this by capturing popup fetch event, if you have checked af:popUp documentation then you must have seen concept of popupFetchListener

From Docs-
The PopupFetchEvent is one of two server-side popup events but doesn't have a corresponding client event. The popup fetch event is invoked during content delivery. This means that the event will only queue for popups that have a contentDelivery type of lazy or lazyUncached. Another caveat is that the event will only work when the launch id is set. This is automatically handled by the af:showPopupBehavior but must be provided as a popup hint if programmatically shown.

So here we will see -

How to use popupFetchListener to filter data inside popup ?
How to execute some operation before opening popup ?
How to call AMImpl method before launching popup?