File Handling in Java

//creating a blank file.....!!
package secondtrm;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.swing.JOptionPane;

public class Secondtrm
{
public static void main(String[] args) throws IOException
{
Secondtrm st = new Secondtrm();
//st.createNewFile();
//st.writeintofile();
//st.readFile();
//st.deleteFile();
//st.renameFile();
//st.CreateDirectory();
//st.DeleteDirectory();
//st.compareFile();
//st.countFileInFoler();
}
private FileInputStream InputStream;
public void createNewFile() throws IOException
{
File f = new File("abc.txt");
f.createNewFile();
}
public void writeintofile() throws IOException
{
File f = new File("abc.txt");
FileWriter fw=new FileWriter(f,true);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(JOptionPane.showInputDialog("Enter Text to write:"));
bw.newLine();
bw.close();
}
public void readFile() throws FileNotFoundException, IOException
{
File f = new File("abc.txt");
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
JOptionPane.showMessageDialog(null,br.readLine());
br.close();
}
public void deleteFile()
{
File f = new File("abc.txt");
if(f.exists()) f.delete();
else System.out.print("File doesn't Exist");
}
public void renameFile()
{
File f = new File("abc.txt");
File f2 = new File("newabc.txt");
f.renameTo(f2);
}
public void copyFile() throws IOException
{
File f = new File("newfile.txt");
File f2 = new File("newfile2.txt");
InputStream is= new FileInputStream(f);
OutputStream os= new FileOutputStream(f2,true);
int len;
byte[] buf = new byte[1024];
while((len=is.read(buf))>0)
{
os.write(buf,0,len);
}
is.close();
os.close();
System.out.print("Files Copies successfully");
}
public void CreateDirectory()
{
File f = new File("new Folder");
f.mkdir();
}
public void DeleteDirectory()
{
File f = new File("new Folder");
f.delete();
}
public void getFileProperties()
{
File f= new File("abc.txt");
System.out.println(f.canExecute());
System.out.println(f.canRead());
System.out.println(f.canExecute());
System.out.println(f.exists());
System.out.println(f.isDirectory());
System.out.println(f.isFile());
System.out.println(f.isHidden());
System.out.println(f.getAbsolutePath());
System.out.println(f.getFreeSpace());
System.out.println(f.getName());
System.out.println(f.getTotalSpace());
System.out.println(f.getUsableSpace());
}
public void setFileProperties()
{
File f = new File("abc.txt");
f.setExecutable(true);
// f.setLastModified("11:11:11");
f.setReadable(true);
f.setWritable(true);
}
public void compareFile()
{
File f = new File("abc.txt");
File f2= new File("cde.txt");
if(f.compareTo(f2)<0) System.out.println("f file is larger..!!"); if(f.compareTo(f2)>0) System.out.println("f file is smaller..!!");
if(f.compareTo(f2)==0) System.out.println("both files are equal in size");
}
public void countFileInFoler()
{
File f = new File("New Folder");
File[] files = f.listFiles();
System.out.println("No. of files in folder:"+files.length);
for(int i=0; i {
System.out.println("Contents of file "+(i+1)+": "+files[i].getName());
}
}
}