title: Cannot see the JTextField after adding JLabel and JButton
body: <p>I am trying to add the basic <code>JFrame</code> in which I add the <code>JLabel</code>, <code>JButton</code> and the <code>JTextField</code> in it. But only two things appear in it at a time.</p>
  
  <p>I want all three to appear in the frame.</p>
  
  <pre><code>import javax.swing.*;
  import java.awt.*;
  
  public class Main {
      JFrame f;
      JLabel l1;
      JButton b1;
      JTextField tf1;
  
      public Main(){
          f=new JFrame();
          l1=new JLabel("This is the new Label");
          l1.setBounds(10,20,50,30);
          b1=new JButton("Submit");
          b1.setBounds(50,70,90,40);
          tf1=new JTextField();
          tf1.setBounds(70,100,90,40);
  
          f.add(l1);
          f.add(b1);
          f.add(tf1);
          l1.setLayout(new BorderLayout());
  
          f.setVisible(true);
          f.setSize(500,500);
          f.setLayout(null);
      }
  
      public static void main(String[] args) {
          new Main();
      }
  }
  </code></pre>