JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to set file permissions in java?


Below example shows how to set permissions to a file.


package com.java2novice.files;

import java.io.File;

public class MyFilePermissions {

	public static void main(String a[]){
		
		File scriptFile = new File("/home/java2novice/test.sh");
		System.out.println("Current file permissions:");
		System.out.println("Can Execute? "+scriptFile.canExecute());
		System.out.println("Can Read? "+scriptFile.canRead());
		System.out.println("Can Write? "+scriptFile.canWrite());
		scriptFile.setExecutable(true);
		scriptFile.setReadable(true);
		scriptFile.setWritable(true);
		System.out.println("Now file permissions:");
		System.out.println("Can Execute? "+scriptFile.canExecute());
		System.out.println("Can Read? "+scriptFile.canRead());
		System.out.println("Can Write? "+scriptFile.canWrite());
	}
}

Output:
Current file permissions:
Can Execute? false
Can Read? true
Can Write? false
Now file permissions:
Can Execute? true
Can Read? true
Can Write? true
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Java File IO Operations Sample Code Examples

  1. All file operations.
  2. Show list of all file names from a folder.
  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
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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