Thread: problem with my JFrame; JFrame not closing and stay in background

Hi to all,
I am having problem with my JFrame.
When I click on "Back" button, the classroom details menu appears but the classroom input JFrame stays in the background.
Please help me to correct it.

Here is my code::

import java.awt.*; 
import java.awt.event.*; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 
 
import javax.swing.*; 
import javax.swing.text.MaskFormatter; 
 
import java.util.Date; 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
import java.text.DateFormat; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
 
import java.sql.*; 
import javax.*; 
 
public class addclassroom extends JFrame{ 
public JTextField txt_classno,txt_bname,txt_size,txt_resources; 
public JComboBox cmbfloor; 
public JLabel label1, label2, label3, label4, label5, label6; 
public JButton Save; 
public JButton Reset; 
public JButton Back; 
 
public addclassroom(){ 
 
 
label1 = new javax.swing.JLabel(); 
label1.setFont(new java.awt.Font("Verdana", 3, 14)); // NOI18N 
label1.setForeground(Color.BLACK); 
label1.setText("Classroom Records Input"); 
 
 
label2 = new javax.swing.JLabel("Classroom_No:"); 
txt_classno = new javax.swing.JTextField(8); 
 
label3 = new javax.swing.JLabel("Building Name:"); 
txt_bname = new javax.swing.JTextField(15); 
 
label4 = new javax.swing.JLabel("Building Floor:"); 
String floor[] = {"Ground floor","1st floor","2nd floor","3rd floor","4th floor", "5th floor", "6th floor", "7th floor", "8th floor"}; 
cmbfloor = new javax.swing.JComboBox(floor); 
 
label5 = new javax.swing.JLabel("Size Capacity:"); 
txt_size = new javax.swing.JTextField(5); 
 
 
label6 = new javax.swing.JLabel("Resources"); 
txt_resources = new javax.swing.JTextField(20); 
 
 
 
 
Save = new javax.swing.JButton(); 
Save.setText("Save"); 
 
Reset = new javax.swing.JButton(); 
Reset.setText("Reset"); 
 
Back = new javax.swing.JButton(); 
Back.setText("Back"); 
 
 
label1.setBounds(100, 25, 200, 50); 
 
label2.setBounds(50, 100, 100, 50); 
txt_classno.setBounds(180, 100, 100, 30); 
 
 
 
label3.setBounds(50, 150, 100, 50); 
txt_bname.setBounds(180, 150, 140, 30); 
 
label4.setBounds(50, 200, 100, 50); 
cmbfloor.setBounds(180, 200, 115, 30); 
 
 
 
label5.setBounds(50, 250, 100, 50); 
txt_size.setBounds(180, 250, 65, 30); 
 
 
 
label6.setBounds(50, 300, 100, 50); 
txt_resources.setBounds(180, 300, 175, 30); 
 
 
 
Save.setBounds(100, 400, 75, 20); 
Reset.setBounds(200, 400, 75, 20); 
Back.setBounds(300,400,75,20); 
 
JFrame ciFrame = new JFrame("Classroom Records Input Form"); 
 
ciFrame.add(label1); 
ciFrame.add(label2); 
ciFrame.add(txt_classno); 
ciFrame.add(label3); 
ciFrame.add(txt_bname); 
ciFrame.add(label4); 
ciFrame.add(cmbfloor); 
ciFrame.add(label5); 
ciFrame.add(txt_size); 
ciFrame.add(label6); 
ciFrame.add(txt_resources); 
 
ciFrame.add(Save); 
 
ciFrame.add(Reset); 
ciFrame.add(Back); 
 
 
ciFrame.setLayout(null); 
 
ciFrame.setVisible(true); 
 
ciFrame.setSize(500, 500); 
 
ciFrame.setResizable(false); 
 
ciFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);	
 
 
Save.setMnemonic('S'); 
Save.addActionListener(new ActionListener() { 
public void actionPerformed(ActionEvent e) 
{ 
Save.setEnabled(true); 
} 
}); 
 
Reset.setMnemonic('R'); 
Back.setMnemonic('B'); 
 
Handleraddclassroom h = new Handleraddclassroom(); 
Save.addActionListener(h); 
Reset.addActionListener(h); 
Back.addActionListener(h); 
 
 
} 
 
 
public class Handleraddclassroom implements ActionListener{ 
public void actionPerformed(ActionEvent event){ 
 
String name = ((JButton)event.getSource()).getText(); 
 
 
if (name.equals("Back")){ 
dispose(); 
 
Classroomdetails cm = new Classroomdetails(); 
 
 
} 
 
 
if (name.equals("Reset")){ 
 
txt_classno.setText(""); 
txt_bname.setText(""); 
txt_size.setText(""); 
txt_resources.setText(""); 
 
 
} 
 
if (name.equals("Save")){ 
String filename = "C:/JAVA/schedule.accdb"; 
String database = "jdbcdbc:scheduling"; 
 
//Character & Presence checks 
 
String nsize = txt_size.getText(); 
String rsc = txt_resources.getText(); 
 
Pattern p = Pattern.compile("[A-Z,a-z,&%$@!()*^]"); 
Matcher Cnsize = p.matcher(nsize); 
 
Pattern q = Pattern.compile("[A-Z,a-z,&%$@!()*^]"); 
Matcher Rsc = q.matcher(rsc); 
 
 
if(txt_classno.getText().equals("")){ 
JOptionPane.showMessageDialog(addclassroom.this,"Classroom No field should not be blank"); 
 
} 
 
if(txt_bname.getText().equals("")){ 
JOptionPane.showMessageDialog(addclassroom.this,"Building Name field should not be blank"); 
 
} 
 
if(txt_size.getText().equals("")){ 
JOptionPane.showMessageDialog(addclassroom.this,"Size Capacity field should not be blank"); 
 
}else if(Cnsize.find()){ 
JOptionPane.showMessageDialog(addclassroom.this,"Invalid value for Size capacity entered. Please check again"); 
 
} 
 
 
 
 
if(txt_resources.getText().equals("")){ 
JOptionPane.showMessageDialog(addclassroom.this,"Resources field should not be blank"); 
 
}else if(!Rsc.find()){ 
JOptionPane.showMessageDialog(addclassroom.this,"Invalid value for Resources entered. Please check again"); 
} 
 
 
else{ 
try { 
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
 
 
Connection con = DriverManager.getConnection(database ,"","");	//username &password not being used 
 
String flr=""; 
if(cmbfloor.getSelectedIndex()==0){ 
flr="Ground floor"; } 
else if(cmbfloor.getSelectedIndex()==1){ 
flr="1st floor";} 
 
else if(cmbfloor.getSelectedIndex()==2){ 
flr="2nd floor";} 
else if(cmbfloor.getSelectedIndex()==3){ 
flr="3rd floor";} 
else if(cmbfloor.getSelectedIndex()==4){ 
flr="4th floor";} 
else if(cmbfloor.getSelectedIndex()==5){ 
flr="5th floor";} 
else if(cmbfloor.getSelectedIndex()==6){ 
flr="6th floor";} 
else if(cmbfloor.getSelectedIndex()==7){ 
flr="7th floor";} 
else if(cmbfloor.getSelectedIndex()==8){ 
flr="8th floor";} 
 
 
Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); //The Result set can now scroll forward and back 
 
String sql = "INSERT INTO classroom VALUES('" 
 
+ txt_classno.getText()+ "','" 
+ txt_bname.getText() + "','" 
 
+ flr + "','" 
+ txt_size.getText() + "','" 
+ txt_resources.getText()+ "' )"; 
 
JOptionPane.showMessageDialog(addclassroom.this,"Classroom Records Saved."); 
dispose(); 
 
addclassroom ac = new addclassroom(); 
 
 
s.execute(sql); 
 
 
 
s.close(); 
con.close(); 
 
} catch (Exception e) {System.out.print("Error: " + e);} 
} 
} 
}	
 
 
} 
 
 
 
}

Yikes, that sure is a lot of code for simply displaying two JFrames. I highly suggest you put together an SSCCE that we can look at instead.

Also, it sounds like you might be looking for CardLayout.