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<!DOCTYPE html>
<html lang="en">
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<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta name="description" content="Java File class represents the files and directory pathnames in an abstract manner. This class is used for creation of files and directories, file searching, file deletion, etc."/>
<meta name="keywords" content="File Class, Java File Class, File Class in java,about File Class,use of File Class,data structure,C, C++, Python, Java, HTML, CSS, JavaScript, SQL, PHP, jQuery, XML, DOM, Bootstrap, Tutorials, Articles, Programming, training, learning, quiz, preferences, examples, code"/>
<title>Java File Class | Java Tutorials | CodeMistic</title>
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<h3>Java File Class</h3>
<p><strong>In this tutorial, we will learn about the File Class with the help of an example.</strong></p>
<p>Java File class represents the files and directory pathnames in an abstract manner. This class is used for creation of files and directories, file searching, file deletion, etc.</p>
<h4>Constructors of File Class</h4>
<ul><li><strong>File(File parent, String child) :</strong>This constructor creates a new File instance from a parent abstract pathname and a child pathname string.</li>
<li><strong>File(String pathname) :</strong>This constructor creates a new File instance by converting the given pathname string into an abstract pathname.</li>
<li><strong>File(String parent, String child) :</strong>This constructor creates a new File instance from a parent pathname string and a child pathname string.</li>
<li><strong>File(URI uri) :</strong>This constructor creates a new File instance by converting the given file: URI into an abstract pathname.</li></ul>
<h4>Methods</h4>
<table><tr><th>Methods</th><th>Description</th></tr>
<tr><td>static File createTempFile(String prefix, String suffix)</td><td>It creates an empty file in the default temporary-file directory, using the given prefix and suffix to generate its name.</td></tr>
<tr><td>boolean createNewFile()</td><td>It atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist.</td></tr>
<tr><td>boolean canWrite()</td><td>It tests whether the application can modify the file denoted by this abstract pathname.String[]</td></tr>
<tr><td>boolean canExecute()</td><td>It tests whether the application can execute the file denoted by this abstract pathname.</td></tr>
<tr><td>boolean canRead()</td><td>It tests whether the application can read the file denoted by this abstract pathname.</td></tr>
<tr><td>boolean isAbsolute()</td><td>It tests whether this abstract pathname is absolute.</td></tr>
<tr><td>boolean isDirectory()</td><td>It tests whether the file denoted by this abstract pathname is a directory.</td></tr>
<tr><td>boolean isFile()</td><td>It tests whether the file denoted by this abstract pathname is a normal file.</td></tr>
<tr><td>String getName()</td><td>It returns the name of the file or directory denoted by this abstract pathname.</td></tr>
<tr><td>String getParent()</td><td>It returns the pathname string of this abstract pathname's parent, or null if this pathname does not name a parent directory.</td></tr>
<tr><td>Path toPath()</td><td>It returns a java.nio.file.Path object constructed from the this abstract path.</td></tr>
<tr><td>URI toURI()</td><td>It constructs a file: URI that represents this abstract pathname.</td></tr>
<tr><td>File[] listFiles()</td><td>It returns an array of abstract pathnames denoting the files in the directory denoted by this abstract pathname</td></tr>
<tr><td>long getFreeSpace()</td><td>It returns the number of unallocated bytes in the partition named by this abstract path name.</td></tr>
<tr><td>String[] list(FilenameFilter filter)</td><td>It returns an array of strings naming the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.</td></tr>
<tr><td>boolean mkdir()</td><td>It creates the directory named by this abstract pathname.</td></tr></table>
<h4>Example 1</h4>
<pre><code>
import java.io.*;
public class FileDemo
{
public static void main(String[] args)
{
try {
File file = new File("javaFile123.txt");
if (file.createNewFile())
{
System.out.println("New File is created!");
}
else
{
System.out.println("File already exists.");
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
<strong>Output:</strong>
New File is created!
</code></pre>
<h4>Example 2</h4>
<pre><code>
import java.io.*;
public class FileDemo2 {
public static void main(String[] args) {
String path = "";
boolean bool = false;
try {
// createing new files
File file = new File("testFile1.txt");
file.createNewFile();
System.out.println(file);
// createing new canonical from file object
File file2 = file.getCanonicalFile();
// returns true if the file exists
System.out.println(file2);
bool = file2.exists();
// returns absolute pathname
path = file2.getAbsolutePath();
System.out.println(bool);
// if file exists
if (bool) {
// prints
System.out.print(path + " Exists? " + bool);
}
} catch (Exception e) {
// if any error occurs
e.printStackTrace();
}
}
}
<strong>Output:</strong>
testFile1.txt
/home/Work/Project/File/testFile1.txt
true
/home/Work/Project/File/testFile1.txt Exists? true
</code></pre>
<h4>Example 3</h4>
<pre><code>
import java.io.*;
public class FileExample
{
public static void main(String[] args)
{
File f=new File("/Users/sonoojaiswal/Documents");
String filenames[]=f.list();
for(String filename:filenames)
{
System.out.println(filename);
}
}
}
<strong>Output:</strong>
"info.properties"
"info.properties".rtf
.DS_Store
.localized
Alok news
apache-tomcat-9.0.0.M19
apache-tomcat-9.0.0.M19.tar
bestreturn_org.rtf
BIODATA.pages
BIODATA.pdf
BIODATA.png
struts2jars.zip
workspace
</code></pre>
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