Best answer: How do I get Java to read a file?

How do you make a file readable in Java?

How to set Read Permission on File in Java

  1. import java.io.File;
  2. public class SetReadableTest{
  3. public static void main(String[] args)throws SecurityException {
  4. File file = new File(“C:/setReadableTest.txt”);
  5. if (file.exists()) {
  6. boolean bval = file.setReadable(true);
  7. } else {
  8. if (file.exists()) {

What is the best way to read a file in Java?

If you want to read a file line by line, using BufferedReader is a good choice. BufferedReader is efficient in reading large files. The readline() method returns null when the end of the file is reached.

Can I open a file with Java?

Java Runtime Environment (To Run The file)

If you have the Java Runtime Environment, then all you need to do is to double click on the file name. … And if your file is using an archive program like 7-ZIP, or WinRAR but you want to open them with Java, follow these steps: Right-click on the file. Select ‘Open With’.

How do I open a saved file in Java?

How to open the saved. Java file in command prompt?

  1. +1. you compile it first with: javac FileName.java run with: java FileName Each time you make a change to the file, you’ll need to recompile. …
  2. type .java in command prompt. …
  3. you just need to write file name in the command prompt with extension .java.
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How do you make a file not readable in Java?

One way around is to change the file extension of files in that folder to a random name, so that even though the user tries to open it he cannot find an application to do it. Even though he figures out that it can be opened with a text editor, We will encrypt it. So it becomes non-readable.

How do I set permissions in Java?

To add permission to read the “java. home” property value, choose the Add Permission button again. In the Permissions dialog box, do the following: Choose Property Permission from the Permission drop-down list.

How do I read a file?

First, open a text file for reading by using the open() function. Second, read text from the text file using the file read() , readline() , or readlines() method of the file object.

1) open() function.

Mode Description
‘w’ Open a text file for writing text
‘a’ Open a text file for appending text

How do you read a text line from a file in Java?

Example of read a file line by line using BufferedReader class

  1. import java.io.*;
  2. public class ReadLineByLineExample1.
  3. {
  4. public static void main(String args[])
  5. {
  6. try.
  7. {
  8. File file=new File(“Demo.txt”); //creates a new file instance.

How do I open Java on Windows?

Windows 10

  1. Right-click on the Start button and select the Control Panel option.
  2. In the Windows Control Panel, click on Programs.
  3. Click on the Java icon to open the Java Control Panel.

How do I open Java on Mac?

Click on Apple icon on upper left of screen. Click on the Java icon to access the Java Control Panel.

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How can we open and read a text file in Java?

There are several ways to read a plain text file in Java e.g. you can use FileReader, BufferedReader, or Scanner to read a text file.

Methods:

  1. Using BufferedReader class.
  2. Using Scanner class.
  3. Using File Reader class.
  4. Reading the whole file in a List.
  5. Read a text file as String.

Where do I find Java files?

Android Studio’s java can be found in C:Program FilesAndroidAndroid Studiojre.

What is open () in Java?

Java Desktop class provide an open() method to open a file. It belongs to a java. awt package. Desktop implementation is platform-dependent, so it is necessary to check the operating system supports Desktop or not. The Desktop class looks for an associated application registered on the native desktop to handle a file.

How do I open a .JAR file?

Right-click on the . jar file. Next, select the option “Open with” from the context menu, followed by the corresponding compression program. Once the process has finished and the archive is unpacked, open the file with a double-click.

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