Folder Explorer in Java with Source Code

Last Updated : 17 Mar 2025

Folder Explorer in Java with Source Code: We can develop Folder Explorer in java with the help of IO Stream, AWT/Swing with event handling. Let's see the code of creating Folder Explorer in java.

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
/***********************************/
class Explorer extends JPanel implements ActionListener
{
JTextField jtf;
JTextArea jta;
JTree tree;
JButton refresh;
JTable jtb;
JScrollPane jsp;
JScrollPane jspTable;

String currDirectory=null;

final String[] colHeads={"File Name","SIZE(in Bytes)","Read Only","Hidden"};
String[][]data={{"","","","",""}};

/////////////////////////////////
Explorer(String path)
{

jtf=new JTextField();
jta=new JTextArea(5,30);
refresh=new JButton("Refresh");

File temp=new File(path);
DefaultMutableTreeNode top=createTree(temp);

//if(top!=null)

tree=new JTree(top);

jsp=new JScrollPane(tree);

final String[] colHeads={"File Name","SIZE(in Bytes)","Read Only","Hidden"};
String[][]data={{"","","","",""}};
jtb=new JTable(data, colHeads);
jspTable=new JScrollPane(jtb);

setLayout(new BorderLayout());
add(jtf,BorderLayout.NORTH);
add(jsp,BorderLayout.WEST);
add(jspTable,BorderLayout.CENTER);
add(refresh,BorderLayout.SOUTH);

tree.addMouseListener(
new MouseAdapter()
{
public void mouseClicked(MouseEvent me)
{
doMouseClicked(me);
}
});
jtf.addActionListener(this);
refresh.addActionListener(this);
}
///////////////////////////////
public void actionPerformed(ActionEvent ev)
{
File temp=new File(jtf.getText());
DefaultMutableTreeNode newtop=createTree(temp);
if(newtop!=null)
	tree=new JTree(newtop);
remove(jsp);
jsp=new JScrollPane(tree);
setVisible(false);
add(jsp,BorderLayout.WEST);
tree.addMouseListener(
new MouseAdapter()
{
public void mouseClicked(MouseEvent me)
{
doMouseClicked(me);
}
});

setVisible(true);
}
//////////////////////////////

DefaultMutableTreeNode createTree(File temp)
{
DefaultMutableTreeNode top=new DefaultMutableTreeNode(temp.getPath());
if(!(temp.exists() && temp.isDirectory()))
	return top;

fillTree(top,temp.getPath());

return top;
}
//////////////////////////////
void fillTree(DefaultMutableTreeNode root, String filename)
{
File temp=new File(filename);

if(!(temp.exists() && temp.isDirectory()))
	return;
//System.out.println(filename);
File[] filelist=temp.listFiles();

for(int i=0; i<filelist.length; i++)
{
if(!filelist[i].isDirectory())
	continue;
final DefaultMutableTreeNode tempDmtn=new DefaultMutableTreeNode(filelist[i].getName());
root.add(tempDmtn);
final String newfilename=new String(filename+"\\"+filelist[i].getName());
Thread t=new Thread()
{
public void run()
{
fillTree(tempDmtn,newfilename);
}//run
};//thread
if(t==null) 
	{System.out.println("no more thread allowed "+newfilename);return;}
t.start();
}//for
}//function
//////////////////////////////
void doMouseClicked(MouseEvent me)
{
TreePath tp=tree.getPathForLocation(me.getX(),me.getY());
if(tp==null) return;
//jtf.setText(tp.toString());
String s=tp.toString();
s=s.replace("[","");
s=s.replace("]","");
s=s.replace(", ","\\");
//s=s.replace(" ","");
//int z=s.lastIndexOf("\"\\\"");
//s="\'"+s;	s=s+"\'";
jtf.setText(s);
showFiles(s);
//java.util.StringTokenizer st=new java.util.StringTokenizer(s,",");
//jtf.setText(jtf.getText()+"="+s);

}
////////////////////////////////
void showFiles(String filename)
{
File temp=new File(filename);
data=new String[][]{{"","","",""}};
remove(jspTable);
jtb=new JTable(data, colHeads);
jspTable=new JScrollPane(jtb);
setVisible(false);
add(jspTable,BorderLayout.CENTER);
setVisible(true);

if(!temp.exists()) return;
if(!temp.isDirectory()) return;

//System.out.println(filename);
File[] filelist=temp.listFiles();
int fileCounter=0;
data=new String[filelist.length][4];
for(int i=0; i<filelist.length; i++)
{
if(filelist[i].isDirectory())
	continue;
data[fileCounter][0]=new String(filelist[i].getName());
data[fileCounter][1]=new String(filelist[i].length()+"");
data[fileCounter][2]=new String(!filelist[i].canWrite()+"");
data[fileCounter][3]=new String(filelist[i].isHidden()+"");
fileCounter++;
}//for

String dataTemp[][]=new String[fileCounter][4];
for(int k=0; k<fileCounter; k++)
	dataTemp[k]=data[k];
data=dataTemp;

//System.out.println(data);
remove(jspTable);
jtb=new JTable(data, colHeads);
jspTable=new JScrollPane(jtb);
setVisible(false);
add(jspTable,BorderLayout.CENTER);
setVisible(true);
}
////////////////////////////////
///////////////////////////////
}
/***********************************/
class ExplorerTest extends JFrame
{

ExplorerTest(String path)
{
super("Windows Exploder - Javatpoint");
add(new Explorer(path),"Center");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(400,400);
setVisible(true);
}

public static void main(String[] args)
{
new ExplorerTest(".");
}
}
/***********************************/

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