How to stop the data flow untill an event happens

Question

hi
i have made a file\folderchooser and with the appropreate bean class
and instead of a actionEvent for the button i have captured
museclicked
the problem is how do i make the flow of data sleep till the mouse is clicked 2 times .
The main method
public static void main(String args[])
file_folder_chooser FFC=new file_folder_chooser();
FFC.show();
String fold=FFC.getSeleDirectory();
String file=FFC.getSeleFile();
System.out.println(fold+file);
this method gives me a nullpointer exception because the operation is not over and there is no value in getSelefile()//getSeleDirectory()
the solution that i found was to call Thread.sleep(15000);
which stops the flow for 15 secs and if the operation does not end, then i get the nullpointer exception again.
is there is a method to make all the threads sleep?
please help me to understand
thank you
vinay

Answer 1

so here it is
it works both on mouse and enterkey
and the mouseEvent has to be debugged
import javax.swing.border.*;
import javax.swing.tree.*;
import java.util.zip.*;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class checker1 extends JFrame
public static JTree tr,tr1;
public static JFrame fin;
public static java.awt.List lis1,lis;
public static JTextField tfpath,tedir,tefile,tfsave;
public static String ab,ac;
public static String bb[],bc[];
public static JRadioButton dir ,singlefile,multiplefile,singledir,multipledir;
public static JPanel p6;
public boolean entkey;
public checker1()
try{
addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent windowevent){setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);                     dispose();                     }});
bb=new String[20];
bc=new String[20];
setTitle("File menu");
tedir=new JTextField();
JPanel p=new JPanel();
p.setLayout(new BorderLayout());
JPanel p1=new JPanel();
JPanel p7=new JPanel();
JPanel p2=new JPanel();
p2.setBorder(new BevelBorder(BevelBorder.RAISED));
p2.setLayout(new FlowLayout(FlowLayout.RIGHT));
JLabel lb=new JLabel(" Present \\ Directory ");
p2.add(lb);
tfpath=new JTextField();
tfpath.setColumns(30);
tfpath.setEditable(false);
p2.add(tfpath);
JCheckBox cb=new JCheckBox("edit");
cb.setSelected(false);
p2.add(cb);
cb.addItemListener(new C());
JPanel p3=new JPanel();
JLabel lb1=new JLabel(" Filter's ");
p3.add(lb1,"West");
JComboBox cob=new JComboBox();
cob.addItem("java");
cob.addItem("class");
cob.addItem("htm");
cob.addItem("html");
cob.addItem("txt");
p3.add(cob,"East");
cob.addItemListener(new tellf());
p3.setBorder(new BevelBorder(BevelBorder.LOWERED));
p3.setLayout(new FlowLayout(FlowLayout.RIGHT));
JPanel p5=new JPanel();
JButton but=new JButton(" To File Root's ");
JButton qb=new JButton("Sort");
qb.addActionListener(new sorter());
p5.add(qb);
but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){
try{
lis.removeAll();
lis1.removeAll();
tfpath.setText("");
File f[]=File.listRoots();
for(int i=0;i<f.length;i++)
lis.add((f.toString()));
} }catch(Exception ew){System.out.println(ew);}
p5.add(but,"Center");
p5.setBorder(new BevelBorder(BevelBorder.LOWERED));
p5.setLayout(new FlowLayout(FlowLayout.RIGHT));
p6=new JPanel();
p6.setBorder(new BevelBorder(BevelBorder.LOWERED));
p6.setLayout(new FlowLayout(FlowLayout.RIGHT));
tfsave=new JTextField();
tfsave.setColumns(15);
tfsave.addKeyListener(new ketsave());
p6.setVisible(false);
p6.add(tfsave);
p7.setLayout(new BorderLayout());
JPanel p4=new JPanel();
p4.setLayout(new GridLayout(3,1));
p4.add(p3);
p4.add(p5);
p4.add(tfsave);
tfsave.setEditable(false);
p4.setBorder(new BevelBorder(BevelBorder.RAISED));
//p4.setLayout(new FlowLayout(FlowLayout.RIGHT));
p1.setLayout(new BorderLayout());
p.setBorder(new BevelBorder(BevelBorder.LOWERED));
p1.setBorder(new BevelBorder(BevelBorder.LOWERED));
tedir.setBackground(Color.white);
tedir.setText("te");
tedir.setForeground(Color.blue);
tedir.setColumns(15);
getContentPane().setLayout(new BorderLayout());
p.add(tedir,"North");
lis=new java.awt.List(10);//dir
lis.addActionListener(new RECOV());
lis.addKeyListener(new ressolver());
//lis.addMouseListener(new ressolver2());// yet to be debugged
p.add(lis,"South");
tefile=new JTextField();
tefile.setForeground(Color.blue);
tefile.setColumns(15);
p1.add(tefile,"North");
lis1=new java.awt.List(10);//files
lis1.addKeyListener(new ressolver1());
//lis1.addMouseListener(new ressolver3());// yet to be debugged
p1.add(lis1,"South");
if(ab==(null)){
tfpath.setText("");
File f[]=File.listRoots();
for(int i=0;i<f.length;i++)
lis.add((f[i].toString()));
else if(ab!=(null)){
tfpath.setText(ab);
File f1=new File(ab);
if((f1.exists())==true)
String s[]=f1.list();
for(int j=0;j<s.length;j++)
File f2=new File(f1+"/"+s[j]);
if(f2.isDirectory())
byte b[]={92};
String s0s=new String(b);
lis.add(s[j]+s0s);
else
if(s[j].endsWith(tellf))
lis1.add(s[j]);
else
JOptionPane.showMessageDialog(getContentPane(),"DRIVE NOT ACCESSABLE","DRIVE ERROR",JOptionPane.ERROR_MESSAGE);
else{
p7.add(p2,"North");
p7.add(p4,"Center");
p7.add(p1,"East");
p7.add(p,"West");
JPanel p8=new JPanel();
p8.setLayout(new GridLayout(4,1));
singledir=new JRadioButton(" singleDirectory FILTER ");
p8.add(singledir);
multiplefile = new JRadioButton(" Multiplefile FILTER ");
p8.add(multiplefile);
multipledir = new JRadioButton(" Multipledir FILTER ");
p8.add(multipledir);
JRadioButton saveP = new JRadioButton(" save Panel ");
p8.add(saveP);
ButtonGroup group1 = new ButtonGroup();
group1.add(multipledir);
group1.add(multiplefile);
group1.add(singledir);
group1.add(saveP);
multipledir.addActionListener(new muldirfil());
multiplefile.addActionListener(new mulfilfil());
singledir.addActionListener(new singledirfil());
saveP.addActionListener(new savep());
getContentPane().add(p8,"East");
getContentPane().add(p7,"West");
pack();
show();
// Thread.sleep(20000);
}catch(Exception re)
{System.out.println(re);JOptionPane.showMessageDialog(getContentPane(),"an exception occcured"+re.getMessage(),"EXCEPTION",JOptionPane.ERROR_MESSAGE);}
public class sorter implements ActionListener
public void actionPerformed(ActionEvent e)
java.util.List l=new ArrayList();
java.util.List l1=new ArrayList();
String ss[]=lis.getItems();
for(int y=0;y<ss.length;y++){
l.add(ss[y]);
String ss1[]=lis1.getItems();
for(int y=0;y<ss1.length;y++){
l1.add(ss1[y]);
Collections.sort(l);
Collections.sort(l1);
int a=l.size();
int a1=l1.size();
lis.removeAll();
for(int y=0;y<a;y++){
lis.add((String)l.get(y));
lis1.removeAll();
for(int y=0;y<a1;y++){
lis1.add((String)l1.get(y));
public class savep implements ActionListener
public void actionPerformed(ActionEvent e)
tfsave.setEditable(true);
public class ketsave extends KeyAdapter
public void keyPressed(KeyEvent e)
if((e.getKeyCode())==KeyEvent.VK_ENTER)
ab=tfpath.getText();
ac=tfsave.getText();
setDirectoryName(ab);
setFileName(ac);
String sw=getDirectoryName();
String g3=getFileName();
// System.out.println(sw+g3);
public class ressolver1 extends KeyAdapter
public void keyPressed(KeyEvent e)
setEnterKeyStateName(false);
try{
synchronized(c)
c.notifyAll();
c.removnot();
}catch(Exception q){System.out.println(c+"   "+q);}
lis.removeAll();
if((e.getKeyCode())==KeyEvent.VK_ENTER)
ab=tfpath.getText();
String ss[]=lis1.getSelectedItems();
int r=ss.length;
// System.out.println(ab);
setDirectoryName(ab);
if(r>1)
setFiles(ss);
else if(r==1)
setFileName(ss[0]);
else
setEnterKeyStateName(true);
String sw=getDirectoryName();
String g5[]=getFiles();
String g3=getFileName();
for(int y=0;y<g5.length;y++)
// System.out.println("selected File's are >>>>>> "+sw+g5[y]);
// System.out.println("selected File is >>>>>> "+sw+g3);
public class ressolver3 extends MouseAdapter
public void mouseClicked(MouseEvent e)
setEnterKeyStateName(false);
try{
synchronized(c)
c.notifyAll();
c.removnot();
}catch(Exception q){System.out.println(c+"   "+q);}
lis.removeAll();
if((e.getClickCount())==3)
ab=tfpath.getText();
String ss[]=lis1.getSelectedItems();
int r=ss.length;
// System.out.println(ab);
setDirectoryName(ab);
if(r>1)
setFiles(ss);
else if(r==1)
setFileName(ss[0]);
else
setEnterKeyStateName(true);
String sw=getDirectoryName();
String g5[]=getFiles();
String g3=getFileName();
for(int y=0;y<g5.length;y++)
// System.out.println("selected File's are >>>>>> "+sw+g5[y]);
// System.out.println("selected File is >>>>>> "+sw+g3);
public class ressolver2 extends MouseAdapter
public void mouseClicked(MouseEvent e)
setEnterKeyStateName(false);
lis1.removeAll();
try{
synchronized(c)
c.notifyAll();
c.removnot();
}catch(Exception q){System.out.println(c+"   "+q);}
if((e.getClickCount())==3)
ab=tfpath.getText();
String ss[]=lis.getSelectedItems();
for(int y=0;y<ss.length;y++)
ss[y]=(ab+ss[y]);
//System.out.println(ss[y]);
int r=ss.length;
if(r>1)
setDirectorys(ss);
else if(r==1)
setDirectoryName(ss[0]);
} else{}
setEnterKeyStateName(true);
String sw=getDirectoryName();
String g5[]=getDirectorys();
for(int y=0;y<g5.length;y++)
// System.out.println("selected dir's are >>>>>> "+g5[y]);
//System.out.println("selected dir is >>>>>> "+sw);
try{
synchronized(c)
c.notifyAll();
c.removnot();
}catch(Exception q){System.out.println(q);}
public class ressolver extends KeyAdapter
public void keyPressed(KeyEvent e)
setEnterKeyStateName(false);
lis1.removeAll();
try{
synchronized(c)
c.notifyAll();
c.removnot();
}catch(Exception q){System.out.println(c+"   "+q);}
if((e.getKeyCode())==KeyEvent.VK_ENTER)
ab=tfpath.getText();
String ss[]=lis.getSelectedItems();
for(int y=0;y<ss.length;y++)
ss[y]=(ab+ss[y]);
//System.out.println(ss[y]);
int r=ss.length;
if(r>1)
setDirectorys(ss);
else if(r==1)
setDirectoryName(ss[0]);
} else{}
setEnterKeyStateName(true);
String sw=getDirectoryName();
String g5[]=getDirectorys();
for(int y=0;y<g5.length;y++)
// System.out.println("selected dir's are >>>>>> "+g5[y]);
//System.out.println("selected dir is >>>>>> "+sw);
try{
synchronized(c)
c.notifyAll();
c.removnot();
}catch(Exception q){System.out.println(q);}
public class keylis extends KeyAdapter
public void keyPressed(KeyEvent e)
if((e.getKeyCode())==KeyEvent.VK_ENTER){
lis.removeAll();
lis1.removeAll();
File d=new File(tfpath.getText());
File f1=new File(d.toString());
if((f1.exists())==true)
String s[]=f1.list();
for(int j=0;j<s.length;j++)
File f2=new File(f1+"/"+s[j]);
if(f2.isDirectory())
byte b[]={92};
String s0s=new String(b);
lis.add(s[j]+s0s);
else
if((s[j].endsWith(tellf))&&((s[j].indexOf("$"))==-1))
lis1.add(s[j]);
else
JOptionPane.showMessageDialog(getContentPane(),"DRIVE NOT ACCESSABLE","DRIVE ERROR",JOptionPane.ERROR_MESSAGE);
public class C implements ItemListener
public void itemStateChanged(ItemEvent e)
int ss=e.getStateChange();
if(ss==1){
tfpath.setEditable(true);
tfpath.addKeyListener(new keylis());
tfpath.setToolTipText(" Write The Dir And Only The Dir");
else{
tfpath.setEditable(false);
public class mulfilfil implements ActionListener
public void actionPerformed(ActionEvent e)
tacle=2;
tfsave.setEditable(false);
lis.setMultipleMode(false);
lis.removeKeyListener(new ressolver());
lis1.setMultipleMode(true);
static int tacle=1;
public class muldirfil implements ActionListener
public void actionPerformed(ActionEvent e)
tacle=3;
tfsave.setEditable(false);
lis.setMultipleMode(true);
lis1.removeKeyListener(new ressolver1());
lis1.setMultipleMode(false);
lis.removeAll();
lis1.removeAll();
File d=new File(tfpath.getText());
File f1=new File(d.toString());
if((f1.exists())==true)
String s[]=f1.list();
for(int j=0;j<s.length;j++)
File f2=new File(f1+"/"+s[j]);
if(f2.isDirectory())
byte b[]={92};
String s0s=new String(b);
lis.add(s[j]+s0s);
else
// if(s[j].endsWith(tellf))
// lis1.add(s[j]);
else
JOptionPane.showMessageDialog(getContentPane(),"DRIVE NOT ACCESSABLE","DRIVE ERROR",JOptionPane.ERROR_MESSAGE);
System.out.println();
public class singlefilfil implements ActionListener
public void actionPerformed(ActionEvent e)
tfsave.setEditable(false);
lis.removeKeyListener(new ressolver());
lis1.removeKeyListener(new ressolver1());
lis.setMultipleMode(false);
lis1.setMultipleMode(false);
tacle=1;
public class singledirfil implements ActionListener
public void actionPerformed(ActionEvent e)
tfsave.setEditable(false);
lis.removeKeyListener(new ressolver());
lis1.removeKeyListener(new ressolver1());
lis.setMultipleMode(false);
lis1.setMultipleMode(false);
lis.removeAll();
lis1.removeAll();
File d=new File(tfpath.getText());
setDirectoryName(d.toString());
File f1=new File(d.toString());
if((f1.exists())==true)
String s[]=f1.list();
for(int j=0;j<s.length;j++)
File f2=new File(f1+"/"+s[j]);
if(f2.isDirectory())
byte b[]={92};
String s0s=new String(b);
lis.add(s[j]+s0s);
else
// if(s[j].endsWith(tellf))
// lis1.add(s[j]);
else
JOptionPane.showMessageDialog(getContentPane(),"DRIVE NOT ACCESSABLE","DRIVE ERROR",JOptionPane.ERROR_MESSAGE);
tacle=4;
System.out.println();
public class RECOV1 implements ActionListener
public void actionPerformed(ActionEvent e)
String ss=lis1.getItem(lis1.getSelectedIndex());
String sq=tfpath.getText();
ab=sq;
if(sq.equals(null))
sq="";
tefile.setText(ss);
ac=ss;
ss=sq+ss;
public static String tellf="java";
public class tellf implements ItemListener
public void itemStateChanged(ItemEvent e)
String ss=(String)e.getItem();
tellf=ss;
lis.removeAll();
lis1.removeAll();
File d=new File(tfpath.getText());
File f1=new File(d.toString());
if((f1.exists())==true)
String s[]=f1.list();
for(int j=0;j<s.length;j++)
File f2=new File(f1+"/"+s[j]);
if(f2.isDirectory())
if(tacle==1){}
else if(tacle==1){}
else{}
byte b[]={92};
String s0s=new String(b);
lis.add(s[j]+s0s);
else
if(tacle==1){}
else if(tacle==1){}
else{}
if((s[j].endsWith(tellf))&&((s[j].indexOf("$"))==-1))
lis1.add(s[j]);
else
JOptionPane.showMessageDialog(getContentPane(),"DRIVE NOT ACCESSABLE","DRIVE ERROR",JOptionPane.ERROR_MESSAGE);
public class RECOV implements ActionListener
public void actionPerformed(ActionEvent e)
String ss=lis.getItem(lis.getSelectedIndex());
String sq=tfpath.getText();
if(sq.equals(null))
sq="";
tedir.setText(ss);
ss=sq+ss;
tfpath.setText(ss);
lis.removeAll();
lis1.removeAll();
File d=new File(tfpath.getText());
File f1=new File(d.toString());
if((f1.exists())==true)
String s[]=f1.list();
for(int j=0;j<s.length;j++)
File f2=new File(f1+"/"+s[j]);
if(f2.isDirectory())
byte b[]={92};
String s0s=new String(b);
lis.add(s[j]+s0s);
else
if((s[j].endsWith(tellf))&&((s[j].indexOf("$"))==-1))
lis1.add(s[j]);
else
JOptionPane.showMessageDialog(getContentPane(),"DRIVE NOT ACCESSABLE","DRIVE ERROR",JOptionPane.ERROR_MESSAGE);
public void setFiles(String[] bs)
for(int i=0;i<bc.length;i++)
bc[i]="";
this.bc=bs;
public void setDirectorys(String[] bs)
for(int i=0;i<bb.length;i++)
bb[i]="";
this.bb=bs;
public void setFileName(String bs)
ac="";
this.ac=bs;
//System.out.println(ac);
public void setDirectoryName(String bs)
ab="";
this.ab=bs;
//System.out.println(ab);
public String[] getFiles()
//for(int i=0;i<bc.length;i++)
//System.out.println("getf[] "+bc[i]);
return bc;
public String[] getDirectorys()
for(int i=0;i<bb.length;i++)
//System.out.println("getd[] "+bb[i]);
return bb;
public String getFileName()
//System.out.println("get f "+ac);
return ac;
public void setEnterKeyStateName(boolean b)
this.entkey=b;
//System.out.println("getd "+ab);
public boolean getEnterKeyStateName()
//System.out.println("getd "+entkey);
return entkey;
public String getDirectoryName()
//System.out.println("getd "+ab);
return ab;
public static checker1 c;
public void plsShow()throws Exception
synchronized(c)// for c.show
c.wait();
public void removnot()
ch1.setVisible(false);
ch1.dispose();
public static checker1 ch1;
public static void main(String args[])throws Exception
if(ab==null){ab=null;}
c=new checker1();
ch1=c;
c.plsShow();
System.out.println(c.getEnterKeyStateName());
if(c.getEnterKeyStateName()==true)
System.out.println(c.getDirectoryName());
System.out.println(c.getFileName());
Runtime t=Runtime.getRuntime();
Process p=t.exec("start "+c.getDirectoryName()+c.getFileName());
System.out.println(c.getEnterKeyStateName());