Static object vs non-static object......

Question

What is the purpose of static object????
is there any example showing that the advantage of declaring a static object rather than a non-static object??
secondly, why static object/primitive data is initialized before non-static object/primitive data?
apreciate for any respond

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
public class Test3 extends JFrame {
  JDesktopPane jdp = new JDesktopPane();
  public Test3() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    content.add(jdp, BorderLayout.CENTER);
    JButton jb = new JButton("New Thingy");
    content.add(jb, BorderLayout.SOUTH);
    jb.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        try { jdp.add(new Thingy(jdp.getWidth(), jdp.getHeight())); }
        catch (Exception e) { System.out.println(e.getMessage()); }
    setSize(300, 300);
    setVisible(true);
  public static void main(String[] args) { new Test3(); }
class Thingy extends JInternalFrame {
  Random r = new Random();
  static int count=0; //  HERE IT IS!!!
  public Thingy(int w, int h) throws Exception {
    if (count==6) throw new Exception("Too Many Thingies");
    setTitle("T-"+(++count));
    setBounds(r.nextInt(w-100),r.nextInt(h-50),100,50);
    setVisible(true);
}