$show=/label

Java Examples to Create New Empty File and A Temporary File

SHARE:

A quick practical guide to new empty file creation and temporary file creation in Java. Examples on File API createNewFile() and createTempFile​() methods.

1. Overview


In this tutorial, We'll be learning how to create a file in java and how to create a temp file in java.

Example programs demonstrated in the following methods.

createNewFile()
createTempFile()

Example Programs on Files

createNewFile(): method is used to create a new empty file.
createTempFile(): method is used to create a temporary file.

Java Examples to Create New Empty File and A Temporary File




Program: How to write or store data into a temporary file in java?


2. Creating a new file


File api has a method createNewFile() which is used to create a new empty file. Returns a boolean value, if the file is created any errors then true is returned, else false if the file already exists or file creation is failed.

Syntax:

Below is the syntax for createNewFile() method.

public boolean createNewFile() throws IOException

This will throw IOException.

Example:
package com.java.w3schools.blog.java8.files;

import java.io.File;
import java.io.IOException;

/**
 * 
 * Java Examples to Create New Empty File |
 * 
 * @author venkateshn
 *
 */
public class FileCreationExample {

 public static void main(String[] args) {
  File newFile = new File("newfile.txt");
  boolean isFileCreated = false;
  try {
   isFileCreated = newFile.createNewFile();
  } catch (IOException e) {
   e.printStackTrace();
  }

  if (isFileCreated) {
   System.out.println("New blank file created.");
  } else {
   System.out.println("File already exists");
  }

 }

}

Output:

New blank file created.

Once we run the program, It will create a new file. If we execute the same program multiple times then it will return false and prints "File already exists".

3. Creating a temporary file in Java


To create a temporary file, java File api has a method.

createTempFile() method is used to create temp file. For this method, We need to pass the file name and extension. Let us look at the following syntax.

Syntax:

public static File createTempFile​(String prefix, String suffix) throws IOException
public static File createTempFile​(String prefix, String suffix, File directory) throws IOException

This is a static method and an overloaded method. Directly this method can be accessed by class name like File.createTempFile().

Takes two arguments such as prefix and suffix. The prefix indicates the file name and it must be a minimum of three characters. The suffix indicates file type or extension. The suffix can be null, if null is supplied then .tmp will be the extension.

When method executes it appends some random number to the suffix value to make sure the file name is unique even if we rerun the program multiple times.

3.1 Example to create a temp file in the default temporary directory:


By default, createTempFile() method create a temp file in default temp location.

package com.java.w3schools.blog.java8.files;

import java.io.File;
import java.io.IOException;

/**
 * 
 * Java Examples to Create a Temporary File
 * 
 * @author venkateshn
 *
 */
public class CreateTempFileExample {

 public static void main(String[] args) {

  try {
   File tempFile = File.createTempFile("Test", null);
   System.out.println("Test.tmp file created in default location ");
   String fileLocation = tempFile.getAbsolutePath();
   System.out.println("Defalut temp location: " + fileLocation);
  } catch (IOException e) {
   e.printStackTrace();
  }

 }

}

Output:

In the above program, the suffix is passed as null. So, We expect the file must be created with .tmp extension. Let us look at the output. These programs are executed on the mac machine.

Test.tmp file created in default location 
Defalut temp location: /var/folders/g0/0x5m1w1950z18h3m6z6h1_000000gn/T/Test8917927582450411382.tmp


3.2 Example to create CSV file:

try {
 File tempFile = File.createTempFile("Employee", ".csv");
 System.out.println("Employee.csv file created in default location ");
 String fileLocation = tempFile.getAbsolutePath();
 System.out.println("Defalut temp location: " + fileLocation);
} catch (IOException e) {
 e.printStackTrace();
}


Output:

In the above program suffix is supplied as ".csv" and "." period must be placed before the suffix. If we do not provide. then file name would be like mployee10947352513681704779csv.

Employee.csv file created in default location 
Defalut temp location: /var/folders/g0/0x5m1w1950z18h3m6z6h1_000000gn/T/Employee10947352513681704779.csv  

3.3 Creating Temp file in our own directory instead of default dir


We have to use the overloaded createTempFile() method with 3 arguments as below.

public static File createTempFile​(String prefix, String suffix, File directory) throws IOException

The argument directory will take our new directory where the temp file should be created. If we pass it as null then it considers system default temp location.

package com.java.w3schools.blog.java8.files;

import java.io.File;
import java.io.IOException;

/**
 * 
 * Java Examples to Create a Temporary File
 * 
 * @author venkateshn
 *
 */
public class CreateTempFileExample {

 public static void main(String[] args) {

  try {
   File tempFile = File.createTempFile("hello", ".txt", new File("files"));
   System.out.println("hello.txt file created in new location provided");
   String fileLocation = tempFile.getAbsolutePath();
   System.out.println("Checking the file location created : " + fileLocation);
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

}

Output:

hello.txt file created in new location provided
Checking the file location created : /Users/venkateshn/Documents/VenkY/blog/Tutorials/CoreJava/files/hello4719932075815441131.txt

4. Conclusion


In this article, We've covered how to create an empty file using Java File API.

And also seen how to create a temp file in default temporary location and in a custom or given location.

GitHub
File API Ref


COMMENTS

BLOGGER

About Us

Author: Venkatesh - I love to learn and share the technical stuff.
Name

accumulo,1,ActiveMQ,2,Adsense,1,API,31,ArrayList,16,Arrays,2,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,4,Collections,20,Collector,1,Command Line,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,5,Core Java,72,Corona India,1,Create,2,CSS,1,Date,2,Date Time API,3,Dictionary,1,Difference,1,Download,1,Eclipse,2,Efficiently,1,Error,1,Errors,1,Exception,1,Exceptions,2,Fast,1,Files,9,Float,1,Font,1,For examples,1,For loop examples,1,For Loop in Java,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,4,Grant,1,Grep,1,HashMap,1,HTML,2,HttpClient,2,Immutable,1,Inner for loops,1,Installation,1,Interview Questions,5,Iterate,2,Jackson API,3,Java,28,Java 10,1,Java 11,5,Java 12,5,Java 13,2,Java 14,2,java 5 For loop,1,Java 8,48,Java 9,1,Java Design Patterns,1,Java Files,1,Java for loop,1,Java Program,2,Java Programs,65,java.lang,5,java.util. function,1,jQuery,1,Kotlin,10,Kotlin Programs,6,Lambda,1,lang,29,Leap Year,1,live updates,1,Math,1,Maven,1,Method References,1,Mockito,1,MongoDB,3,Nested for loop,1,Nested for loop examples,1,New Features,1,Operations,1,Optional,4,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,1,Softwares,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Stream,3,Streams,11,String,48,String Programs,8,String Revese,1,Swing,1,System,1,Tags,1,Threads,8,Tomcat,1,Tomcat 8,1,Troubleshoot,16,Unix,2,Updates,3,util,5,While Loop,1,
ltr
item
JavaProgramTo.com: Java Examples to Create New Empty File and A Temporary File
Java Examples to Create New Empty File and A Temporary File
A quick practical guide to new empty file creation and temporary file creation in Java. Examples on File API createNewFile() and createTempFile​() methods.
https://1.bp.blogspot.com/-46l8YgsrpQE/XobMHN88x3I/AAAAAAAACbc/UtdbtKey1MkhIM6ZZ3uBpjsLUt5JAyD_wCLcBGAsYHQ/s640/Java%2BExamples%2Bto%2BCreate%2BNew%2BEmpty%2BFile%2Band%2BA%2BTemporary%2BFile.png
https://1.bp.blogspot.com/-46l8YgsrpQE/XobMHN88x3I/AAAAAAAACbc/UtdbtKey1MkhIM6ZZ3uBpjsLUt5JAyD_wCLcBGAsYHQ/s72-c/Java%2BExamples%2Bto%2BCreate%2BNew%2BEmpty%2BFile%2Band%2BA%2BTemporary%2BFile.png
JavaProgramTo.com
https://www.javaprogramto.com/2020/04/java-examples-to-create-new-empty-file.html
https://www.javaprogramto.com/
https://www.javaprogramto.com/
https://www.javaprogramto.com/2020/04/java-examples-to-create-new-empty-file.html
true
3124782013468838591
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content