JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: All file operations.


Description:
Below example shows basic operations on File object.
canRead(): Tests whether the application can read the file canWrite(): Tests whether the application can modify the file createNewFile(): Tests whether the application can modify the file delete(): Deletes the file or directory exists(): Tests whether the file or directory exists. getAbsolutePath(): Returns the absolute pathname string. isDirectory(): Tests whether the file is a directory or not. isHidden(): Tests whether the file is a hidden file or not. list(): Returns an array of strings naming the files and directories in the directory.

Code:
package com.java2novice.files;

import java.io.File;

public class MyFileOperations {

	public static void main(String[] a){
		
		try{
			File file = new File("fileName");
			//Tests whether the application can read the file 
			System.out.println(file.canRead());
			//Tests whether the application can modify the file
			System.out.println(file.canWrite());
			//Tests whether the application can modify the file 
			System.out.println(file.createNewFile());
			//Deletes the file or directory
			System.out.println(file.delete());
			//Tests whether the file or directory exists.
			System.out.println(file.exists());
			//Returns the absolute pathname string.
			System.out.println(file.getAbsolutePath());
			//Tests whether the file is a directory or not.
			System.out.println(file.isDirectory());
			//Tests whether the file is a hidden file or not.
			System.out.println(file.isHidden());
			//Returns an array of strings naming the 
			//files and directories in the directory.
			System.out.println(file.list());
		} catch(Exception ex){
			
		}
	}
}
 Next Program >>
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Java File IO Operations Sample Code Examples

  1. All file operations.
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  3. How to get list of all files from a folder?
  4. Filter the files by file extensions and show the file names.
  5. How to read file content using byte array?
  6. How to read file content line by line in java?
  7. How to read property file in static context?
  8. How to read input from console in java?
  9. How to get file list from a folder filtered by extensions?
  10. How to get file URI reference?
  11. How to store and read objects from a file?
  12. How to create and store property file dynamically?
  13. How to store property file as xml file?
  14. How to get file last modified time?
  15. How to convert byte array to inputstream?
  16. How to convert inputstream to reader or BufferedReader?
  17. How to convert byte array to reader or BufferedReader?
  18. How to set file permissions in java?
  19. How to read a file using BufferedInputStream?
  20. How to create temporary file in java?
  21. How to write or store data into temporary file in java?
  22. How to delete temporary file in java?
  23. How to write string content to a file in java?
  24. How to write byte content to a file in java?
Knowledge Centre
Can interface be final?
No. We can not instantiate interfaces, so in order to make interfaces useful we must create subclasses. The final keyword makes a class unable to be extended.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to java2novice@gmail.com or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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