Thread: JLabel and set Location doesn't work correctly

Hello everyone
i'm making a programe that has buttons, labels, and text fields and i'm having a problem with JLabel where when i try to use SetLocation it works on the first three Label but its doesn't work on the fourth one !!
so for example i have 3 labels and when i set their location it works correctly but when i set the location for the fourth one it doesn't work.
the one that doesn't work is named AgeLabel in my code.

also sometimes when i run the program one of the buttons get resize by it self and full the whole screen. so for example if i have the button size set to (50,50) sometimes when i run the program it full the whole window and the seize change to for example (800,600). Why ?!!

here is the full class code.

package finalproject;   import java.awt.*; import java.awt.event.*; import javax.swing.*;   public class Interface extends JFrame implements ActionListener{   private final int FRAME_WIDTH = 1024; private final int FRAME_HIGHT = 768; private final int FRAME_X_ORIGIN = 150; private final int FRAME_Y_ORIGIN = 200; private String numberStr;   private JTextField FirstNameFiled = new JTextField(); private JTextField LastNameFiled = new JTextField(); private JTextField AddressFiled = new JTextField(); private JTextField AgeFiled = new JTextField();   private Container ContentPane = getContentPane();   public Interface() {   SetWindow(); Buttons(); TextField(); Lable(); }   private void SetWindow() {   this.setTitle("Final Project"); this.setSize(FRAME_WIDTH, FRAME_HIGHT); this.setLocation(FRAME_X_ORIGIN, FRAME_Y_ORIGIN); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setVisible(true); this.setResizable(false); }   private void Buttons() { JButton ExitButton, SaveButton, LoadButton;   ExitButton = new JButton("Exit"); ExitButton.setActionCommand("Exit"); ExitButton.setLocation(10, 140); ExitButton.setSize(95, 25); ExitButton.addActionListener(this); ContentPane.add(ExitButton);   SaveButton = new JButton("Save File"); SaveButton.setActionCommand("Save_File"); SaveButton.setLocation(110, 140); SaveButton.setSize(95, 25); SaveButton.addActionListener(this); ContentPane.add(SaveButton);   LoadButton = new JButton("Load File"); LoadButton.setActionCommand("Load_File"); LoadButton.setLocation(210, 140); LoadButton.setSize(95, 25); LoadButton.addActionListener(this); ContentPane.add(LoadButton); }   private void Lable() {   JLabel FirstNameLabel = new JLabel(); FirstNameLabel.setText("First Name: "); FirstNameLabel.setSize(100,20); FirstNameLabel.setLocation(10, 10); ContentPane.add(FirstNameLabel);   JLabel LastNameLabel = new JLabel(); LastNameLabel.setText("Last Name: "); LastNameLabel.setSize(100,20); LastNameLabel.setLocation(240, 10); ContentPane.add(LastNameLabel);   JLabel AddressLabel = new JLabel(); AddressLabel.setText("Address: "); AddressLabel.setSize(100,20); AddressLabel.setLocation(10, 50); ContentPane.add(AddressLabel);   JLabel AgeLabel = new JLabel(); AgeLabel.setText("Age: "); AgeLabel.setSize(100, 20); AgeLabel.setLocation(240, 50); ContentPane.add(AgeLabel); }   private void TextField() {   FirstNameFiled.setActionCommand("FirstNameFiled"); FirstNameFiled.setText("First Name"); FirstNameFiled.setSize(100, 25); FirstNameFiled.setLocation(85, 9); FirstNameFiled.addActionListener(this); ContentPane.add(FirstNameFiled);   LastNameFiled.setActionCommand("LastNameFiled"); LastNameFiled.setText("Last Name"); LastNameFiled.setSize(100, 25); LastNameFiled.setLocation(315, 9); LastNameFiled.addActionListener(this); ContentPane.add(LastNameFiled);   AddressFiled.setActionCommand("AddressFiled"); AddressFiled.setText("Address"); AddressFiled.setSize(100, 25); AddressFiled.setLocation(85, 48); AddressFiled.addActionListener(this); ContentPane.add(AddressFiled);   AgeFiled.setActionCommand("AgeFiled"); AgeFiled.setText("Age"); AgeFiled.setSize(100, 25); AgeFiled.setLocation(315, 48); AgeFiled.addActionListener(this); ContentPane.add(AgeFiled); }   public void actionPerformed(ActionEvent Action) { if(Action.getActionCommand().contains("Exit")) System.exit(0);   if(Action.getActionCommand().equals("Save_File")) { System.out.print("Saving File"); }   if(Action.getActionCommand().equals("Load_File")) { System.out.print("Loading File"); }   if (Action.getActionCommand().contains("FirstNameFiled")) { numberStr = FirstNameFiled.getText(); }   if (Action.getActionCommand().contains("LastNameFiled")) { numberStr = LastNameFiled.getText(); }   if (Action.getActionCommand().contains("AddressFiled")) { numberStr = AddressFiled.getText(); }   if (Action.getActionCommand().contains("AgeFiled")) { numberStr = AgeFiled.getText(); } } }

LOL sorry and thank you
i'm a newbie

ok i just added this line of code and everything is now working correctly
ContentPane.setLayout(null);
if you guys don't mind can you just take a quick look at my code and tell me if i'm doing some bad programing practice and can anyone give me some tips on my code.

thanks alot.

may i ask why ?