Java.io.File.createTempFile() Method

Description

The java.io.File.createTempFile(String prefix, String suffix) method atomically creates an empty file in the default temporary folder.

Declaration

Following is the declaration for java.io.File.createTempFile(String prefix, String suffix) method:

public static File createTempFile(String prefix, String suffix)

Parameters

• prefix -- The prefix string defines the files name; must be at least three characters long

• suffix -- The suffix string defines the file's extension; if null the suffix ".tmp" will be used

Return Value

An abstract pathname for the newly-created empty file.

Exception

• IllegalArgumentException -- If the prefix argument contains less than three characters

• IOException -- If a file creation failed

• SecurityException -- If SecurityManager.checkWrite(java.lang.String) method does not allow a file to be created

Example

The following example shows the usage of java.io.File.createTempFile(String prefix, String suffix) method.

package com.tutorialspoint;

import java.io.File;

public class FileDemo {
   public static void main(String[] args) {
      
      File f = null;
            
      try{
         // creates temporary file
         f = File.createTempFile("tmp", ".txt");
         
         // prints absolute path
         System.out.println("File path: "+f.getAbsolutePath());
         
         // creates temporary file
         f = File.createTempFile("tmp", null);
         
         // prints absolute path
         System.out.print("File path: "+f.getAbsolutePath());
         
      }catch(Exception e){
         // if any error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

File path: C:\Users\TP\AppData\Local\Temp\tmp2447618135336474361.txt
File path: C:\Users\TP\AppData\Local\Temp\tmp1783337266599428081.tmp