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 ?