components only show after I resize the frame

Question

My JLabel will not show immediately after I press the button until I resize the frame I think i have put frame.setVisible(true) in the right place I have looked at similar post and everyone has said the same thing about setvisible and to put it at the end have i put it in the right place can anyone help

 import java.awt.*;
 import java.awt.event.*;

 import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JPasswordField;
 import javax.swing.JTextField;
 import javax.swing.plaf.basic.BasicButtonListener;
 import javax.swing.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JTextField;




public class GUI_login implements ActionListener{

private static JLabel label;
private static JTextField userText;
private static JLabel passwordLabel;
private static JPasswordField passwordText;
public static JButton button;
private static JLabel success;
private static JFrame frame;
private static JPanel panel;
private static JTextField search ;
private static JFrame frame2;
private static JTextField heightw1;
private static JTextField Weightw1;
private static JPanel panel2;
public JButton Done;
public static JTextField diff;
public JPanel f;




public static void main(String[] args) {
    
    panel = new JPanel();
    panel.setBackground(Color.cyan);
    frame = new JFrame("");
    frame.setSize(500,500);
    frame.add(panel);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);

    panel.setLayout(null);
        
    label = new JLabel("Username");
    label.setBounds(525, 250, 70, 20);
    panel.add(label); 
    
    userText = new JTextField();
    userText.setBounds(525, 270, 193, 28);
    panel.add(userText);
    
    passwordLabel = new JLabel("Password");
    passwordLabel.setBounds(525, 300, 70, 20);
    panel.add(passwordLabel);
    
    passwordText = new JPasswordField();
    passwordText.setBounds(525, 320, 193, 28);
    panel.add(passwordText);
    
    button = new JButton("Login");
    button.setBounds(575, 350, 90, 25);
    button.setForeground(Color.WHITE);
    button.setBackground(Color.BLACK);
    button.addActionListener(new GUI_login());
    panel.add(button);
    
    success = new JLabel("");
    success.setBounds(10, 110, 300,25);
    panel.add(success);
    
    
    frame.setVisible(true);
}

void JavaExamples() {
    panel.setVisible(false);
    JPanel f = new JPanel();
    f.setBackground(Color.cyan);
    f.setBounds(0,0,1400,700);
    f.setLayout(null);
    frame.add(f);

    JLabel lb1 = new JLabel("Height(Inches):");
    lb1.setBounds(20, 20, 100, 40);//x axis, y axis, width, height
    f.add(lb1); //adding component in JFrame

    JLabel lb2 = new JLabel("Weight(Pounds):");
    lb2.setBounds(20, 60, 100, 40);//x axis, y axis, width, height
    f.add(lb2); //adding component in JFrame 
    
    JLabel lbResult = new JLabel("BMI Calculator in JAVA GUI");
    lbResult.setBounds(20, 90, 300, 40);//x axis, y axis, width, height
    f.add(lbResult); //adding component in JFrame 
    
    JTextField txtHeight = new JTextField("");
    txtHeight.setBounds(120, 20, 200, 40);//x axis, y axis, width, height
    f.add(txtHeight); //adding component in JFrame 

    JTextField txtWeight = new JTextField("");
    txtWeight.setBounds(120, 60, 200, 40);//x axis, y axis, width, height
    f.add(txtWeight); //adding component in JFrame 

    JButton btn = new JButton("BMI Calculator in JAVA GUI(CALCULATE)");//creating instance of JButton  
    btn.setBounds(20, 130, 300, 40);//x axis, y axis, width, height
    
    //Event
    btn.addActionListener(new ActionListener(){
        @Override
        public void actionPerformed(ActionEvent e) {
            
            double weight=Double.parseDouble(txtWeight.getText());
            double height=Double.parseDouble(txtHeight.getText());
            
            double bmi = weight / Math.pow(height, 2) * 703;

             if (bmi < 18.5) {
                 lbResult.setText("underweight - BMI : "+bmi);
             } else if (bmi < 25) {
                 lbResult.setText("normal - BMI : "+bmi);
             } else if (bmi < 30) {
                 lbResult.setText("overweight - BMI : "+bmi);
             } else {
                 lbResult.setText("obese - BMI : "+bmi);
                 JLabel ob = new JLabel("NutriGYM");
                 ob.setBounds(600, 0, 100, 25);
                 f.add(ob);
             }
        }
    });
    
    JTextField Weighttxt = new JTextField();
    Weighttxt.setBounds(525, 300, 200, 25);
    f.add(Weighttxt);
    
    JTextField wweighttxt = new JTextField();
    wweighttxt.setBounds(525, 250, 200, 25);
    f.add(wweighttxt);
    
    JLabel W = new JLabel("Weight Wanted");
    W.setBounds(525, 275, 100, 25);
    f.add(W);
    
    JLabel H = new JLabel("Weight");
    H.setBounds(525, 225, 100, 25);
    f.add(H);
    
    JButton button1 = new JButton("Done");
    button1.setBounds(575, 325, 90, 25);
    button1.setForeground(Color.WHITE);
    button1.setBackground(Color.BLACK);
    f.add(button1);
    
    button1.addActionListener(new ActionListener() {
    
        @Override
        public void actionPerformed(ActionEvent e) {                
            int one = Integer.parseInt(wweighttxt.getText());
            int two = Integer.parseInt(Weighttxt.getText());
            
            int total = (two - one);
            
            if(total>0) {
                String diff = Integer.toString(total);
                JLabel yes = new JLabel(diff);
                yes.setBounds(600,50,100,25);
                f.add(yes);
            } else {
                String diff = Integer.toString(total);
                JLabel yes1 = new JLabel(diff);
                yes1.setBounds(600,50,100,25);
                f.add(yes1);
            }
            
            
        }
    
    });

    f.add(btn);//adding button in JFrame  
    f.setLayout(null);
    f.setVisible(true);


    
    
}


    

public void actionPerformed(ActionEvent e) {
    int count1 = 0;
    System.out.println("button clicked");
    String user = userText.getText();
    @SuppressWarnings("deprecation")
    String password = passwordText.getText();
    System.out.println(user + ", " + password);
    int count = 0;
    do {
        if(user.equals("") && password.equals("")) {
             JavaExamples();
                
             
            
            count = 1;
            
            
        
    } else { 
        success.setText("login Failed");
        count1 = count1 + 1;
    }
    } while(count == 0);
    
    

    
    
    
    }

private LayoutManager BoxLayout() {
    // TODO Auto-generated method stub
    return null;
}

}