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POwindow not closing on dispose() call
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  1. POwindow not closing on dispose() call
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    copied!<p>Below is my code.</p> <p>It displays one table containing all daily sells, 3 buttons (next, previous, print). When we press next button date advances and next day sell will display in another window. Now here is the main problem - I want that when new window will open the first window should be closed. Can someone help me sort out this problem?</p> <pre><code>package shop; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.awt.print.PrinterException; import java.text.SimpleDateFormat; import java.util.*; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.table.DefaultTableModel; import shop.DBEngine; public class AllCashTable extends JFrame implements ActionListener{ private static String name; private Vector&lt;Vector&lt;String&gt;&gt; data; private Vector&lt;Vector&lt;String&gt;&gt; data1; private Vector&lt;String&gt; header; private Vector&lt;String&gt; header1; JButton next,previous,print; int a=0,d=0,y=0,m=0; JTable table; private JPanel mainPanel = new JPanel(); private String date,month,year; String gt; private String newdate; private static JFrame frame,frame1,frame2; public AllCashTable(String name) throws Exception{ DBEngine dbengine = new DBEngine(); data = dbengine.getDailySellAdd(name); header = new Vector&lt;String&gt;(); header.add("Date"); header.add("Cash"); next=new JButton("Next"); previous=new JButton("Previous"); print=new JButton("Print"); table = new JTable(data, header); table.setRowHeight(40); table.setSelectionBackground(Color.YELLOW); JPanel viewPanel = new JPanel(); viewPanel.setLayout(new BorderLayout()); viewPanel.add(table,BorderLayout.CENTER); JScrollPane scroll = new JScrollPane(viewPanel); scroll.setColumnHeaderView(table.getTableHeader()); mainPanel.setLayout(new BorderLayout()); mainPanel.setBorder(BorderFactory.createEtchedBorder()); mainPanel.add(scroll,BorderLayout.CENTER); for(int i=0;i&lt;table.getRowCount();i++){ a=a+Integer.parseInt(data.get(i).get(1)); } gt=Integer.toString(a); header1 = new Vector&lt;String&gt;(); header1.add("Total"); header1.add(gt); data.setSize(table.getRowCount()+1); data.set(table.getRowCount()-1, header1); JLabel jlab=new JLabel("Total:"); String gt=Integer.toString(a); JLabel jlab3=new JLabel(gt); JLabel jlab4=new JLabel(" "); JPanel viewPanel2=new JPanel(); viewPanel2.add(jlab); viewPanel2.add(jlab3); viewPanel2.add(jlab4); viewPanel2.add(previous); viewPanel2.add(next); viewPanel2.add(print); previous.addActionListener(this); print.addActionListener(this); next.addActionListener(this); mainPanel.add(viewPanel2,BorderLayout.PAGE_END); } public JPanel getMainPanel(){ return mainPanel; } private static void createAndShowUI() throws Exception{ frame = new JFrame("Cash Memo"); frame.getContentPane().add(new AllCashTable(name).getMainPanel()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(330,400); //frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); //frame.setVisible(false); } public static void main(String[] args){ java.awt.EventQueue.invokeLater(new Runnable(){ public void run(){ try { createAndShowUI(); } catch (Exception ex) { Logger.getLogger(AllCashTable.class.getName()).log(Level.SEVERE,null,ex); } } }); } @Override public void actionPerformed(ActionEvent e) { if(e.getSource()==next){ date=data.get(0).get(0); String m[]={"01","02","03","04","05","06","07","08","09","10","11","12"}; Calendar cal=Calendar.getInstance(); date=date.substring(0, 2); d=Integer.parseInt(date)+1; newdate=(d+"/"+m[cal.get(Calendar.MONTH)]+"/"+cal.get(Calendar.YEAR)); frame1 = new JFrame("Cash Memo"); try { frame1.getContentPane().add(new AllCashTable(newdate).getMainPanel()); } catch (Exception ex) { Logger.getLogger(AllCashTable.class.getName()).log(Level.SEVERE, null, ex); } frame1.setSize(330,400); //frame.pack(); frame1.setLocationRelativeTo(null); frame1.setVisible(true); frame.dispose();//here is error nullpointerexception }if(e.getSource()==previous){ date=data.get(0).get(0); String m[]={"01","02","03","04","05","06","07","08","09","10","11","12"}; Calendar cal=Calendar.getInstance(); date=date.substring(0, 2); int ax=Integer.parseInt(date)-1; System.out.println(ax); newdate=(ax+"/"+m[cal.get(Calendar.MONTH)]+"/"+cal.get(Calendar.YEAR)); frame2 = new JFrame("Cash Memo"); try { frame2.getContentPane().add(new AllCashTable(newdate).getMainPanel()); } catch (Exception ex) { Logger.getLogger(AllCashTable.class.getName()).log(Level.SEVERE, null, ex); } //frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame2.setSize(330,400); //frame.pack(); frame2.setLocationRelativeTo(null); frame2.setVisible(true); //frame1.setVisible(false); }if(e.getSource()==print){ try { boolean complete = table.print(); if (complete) { /* show a success message */ System.out.println("Printing Complete"); } else { /*show a message indicating that printing was cancelled */ System.out.println("Not Printed"); } } catch (PrinterException pe) { /* Printing failed, report to the user */ System.out.println(pe); } } } } </code></pre>
 

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