How to go to another JFrame by pressing JButton in this code?

[lolo hyun]

    import java.awt.*;
    import java.awt.event.*;
	 import javax.swing.*;
    public class Bank1 extends JFrame {
	 
	 private JLabel l1;
	 private JLabel l2;
	 private JTextField t1;
	 private JPasswordField p1;
    private JButton b1;
	 
	 public Bank1()
	 {
	    super("Bank System");
		 
		 Container container = getContentPane();
		 container.setLayout(new FlowLayout());
		 
		 
		 l1=new JLabel(" ID :- ");
		 container.add(l1);
		 t1=new JTextField(25);
		 container.add(t1);
		 l2=new JLabel(" Password :- ");
		 container.add(l2);
		 p1=new JPasswordField(25);
		 container.add(p1);
		 b1=new JButton("Enter");
		 container.add(b1);
		 
		 ButtonHandler handler = new ButtonHandler();
		 b1.addActionListener(handler);
		 setSize(400,150);
		 setVisible(true);
	 }
	 public static void main (String args[])
	 {
	   Bank1 application = new Bank1();
	application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	 }
	 
	 private class ButtonHandler implements ActionListener{
	  public void actionPerformed (ActionEvent event)
	   {
		String msg;
		msg = "Login Successful";
		  JOptionPane.showMessageDialog(null,msg);
		  }
		  }
		  }

    

[Buddhika Mawella]

Run following code and check. Hope that is the functionality you want.

import java.awt.*;  
    import java.awt.event.*;  
     import javax.swing.*;  
    public class Bank1 extends JFrame {  
       
     private JLabel l1;  
     private JLabel l2;  
     private JTextField t1;  
     private JPasswordField p1;  
    private JButton b1;  
       
     public Bank1()  
     {  
        super("Bank System");  
           
         Container container = getContentPane();  
         container.setLayout(new FlowLayout());  
           
           
         l1=new JLabel(" ID :- ");  
         container.add(l1);  
         t1=new JTextField(25);  
         container.add(t1);  
         l2=new JLabel(" Password :- ");  
         container.add(l2);  
         p1=new JPasswordField(25);  
         container.add(p1);  
         b1=new JButton("Enter");  
         container.add(b1);  
           
         ButtonHandler handler = new ButtonHandler();  
         b1.addActionListener(handler);  
         setSize(400,150);  
         setVisible(true);  
     }  
     public static void main (String args[])  
     {  
       Bank1 application = new Bank1();  
    application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
     }  
       
	private class ButtonHandler implements ActionListener {
		public void actionPerformed(ActionEvent event) {
			/*String msg;
			msg = "Login Successful";
			JOptionPane.showMessageDialog(null, msg);*/

			JFrame secondFrame = new JFrame("Second Frame");
			secondFrame.setSize(600, 500);
			secondFrame.setVisible(true);
			dispose();
		}
	}  
          }  

[Campbell Ritchie]

Welcome to the Ranch
Why do you want a second frame in the first place? You should use internal frames, or dialogues, and should only have one frame per application.