- Java.io package classes
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- Java.io - File
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- Java.io - FileInputStream
- Java.io - FileOutputStream
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- Java.io - FilterInputStream
- Java.io - FilterOutputStream
- Java.io - FilterReader
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- Java.io - LineNumberInputStream
- Java.io - LineNumberReader
- Java.io - ObjectInputStream
- Java.io - ObjectInputStream.GetField
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- io - ObjectOutputStream.PutField
- Java.io - ObjectStreamClass
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- Java.io - PipedOutputStream
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- Java.io - RandomAccessFile
- Java.io - Reader
- Java.io - SequenceInputStream
- Java.io - SerializablePermission
- Java.io - StreamTokenizer
- Java.io - StringBufferInputStream
- Java.io - StringReader
- Java.io - StringWriter
- Java.io - Writer
- Java.io package extras
- Java.io - Interfaces
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- Java.io package Useful Resources
- Java.io - Discussion
Java - File createTempFile() Method
Description
The Java File createTempFile(String prefix, String suffix, File directory) method creates a new empty file in the specified directory. deleteOnExit() method is called to delete the file created by this method.
Declaration
Following is the declaration for java.io.File.createTempFile(String prefix, String suffix, File directory) method −
public static File createTempFile(String prefix, String suffix, File directory)
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
directory − The directory in which the file is to be created. For default temporary-file directory null is to passed
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 1
The following example shows the usage of Java File createTempFile() method. We've created a File reference. Using createTempFile() method, we're creating the file in temporary directory and printing the absolute path of the file created. We're passing parameters to createTempFile() as tmp, .txt and file path of directory to create the temporary file with prefix as tmp and suffix as .txt.
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", new File("F:/")); // prints absolute path System.out.println("File path: "+f.getAbsolutePath()); } catch(Exception e) { // if any error occurs e.printStackTrace(); } } }
Output
Let us compile and run the above program, this will produce the following result −
File path: F:\tmp11479871496507253874.txt
Example 2
The following example shows the usage of Java File createTempFile() method. We've created a File reference. Using createTempFile() method, we're creating the file in temporary directory and printing the absolute path of the file created. We're passing both parameters to createTempFile() as tmp, null and file path of directory to create the temporary file with prefix as tmp and suffix as .tmp.
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", null, new File("F:/")); // prints absolute path System.out.println("File path: "+f.getAbsolutePath()); } catch(Exception e) { // if any error occurs e.printStackTrace(); } } }
Output
Let us compile and run the above program, this will produce the following result −
File path: F:\tmp11732077494906020658.tmp
Example 3
The following example shows the usage of Java File createTempFile() method. We've created a File reference. Using createTempFile() method, we're creating the file in temporary directory and printing the absolute path of the file created. We're passing both parameters to createTempFile() as tm, .txt and file path of directory to create the temporary file with prefix as tm and suffix as .text. It is to check if we're getting exception or not for too short prefix name.
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("tm", ".txt", new File("F:/")); // prints absolute path System.out.println("File path: "+f.getAbsolutePath()); } catch(Exception e) { // if any error occurs e.printStackTrace(); } } }
Output
Let us compile and run the above program, this will produce the following result −
java.lang.IllegalArgumentException: Prefix string "tm" too short: length must be at least 3 at java.base/java.io.File.createTempFile(File.java:2104) at FileDemo.main(FileDemo.java:9)
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