- Java Introduction
- Java Getting Started
- Java Syntax
- Java Comments
- Java Variables
- Java Data Types
- Java Type Casting
- Java Operators
- Java Strings
- Java Math
- Java Booleans
- Java If ... Else
- Java Switch
- Java While Loop
- Java For Loop
- Java Break And Continue
- Java Arrays
- Java Methods
- Java Method Parameters
- Java Method Overloading
- Java Scope
- Java Recursion
- Java OOP
- Java Classes And Objects
- Java Class Attributes
- Java Class Methods
- Java Constructors
- Java Modifiers
- Java Encapsulation
- Java Packages
- Java Inheritance
- Java Polymorphism
- Java Inner Classes
- Java Abstraction
- Java Interface
- Java Enums
- Java User Input (Scanner)
- Java Date And Time
- Java ArrayList
- Java LinkedList
- Java HashMap
- Java HashSet
- Java Iterator
- Java Wrapper Classes
- Java Exceptions - Try...Catch
- Java Regular Expressions
- Java Threads
- Java Lambda Expressions
- Java Files
- Java Create And Write To Files
- Java Read Files
- Java Delete Files
Java Create and Write To Files
Create A File
To create a file in Java, you can use the createNewFile()
method. This method returns a boolean value: true
if the file was successfully created, and false
if the file already exists. Note that the method is enclosed in a try...catch
block. This is necessary because it throws an IOException
if an error occurs (if the file cannot be created for some reason):
Example
import java.io.File; // Import the File class
import java.io.IOException; // Import the IOException class to handle errors
public class CreateFile {
public static void main(String[] args) {
try {
File myObj = new File("filename.txt");
if (myObj.createNewFile()) {
System.out.println("File created: " + myObj.getName());
} else {
System.out.println("File already exists.");
}
} catch (IOException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}
The output will be:
To create a file in a specific directory (requires permission), specify the path of the file and use double backslashes to escape the "\
" character (for Windows). On Mac and Linux you can just write the path, like: /Users/name/filename.txt
Example
File myObj = new File("C:\\Users\\MyName\\filename.txt");
Practice Excercise Practice now
Write To A File
In the following example, we use the FileWriter
class together with its write()
method to write some text to the file we created in the example above. Note that when you are done writing to the file, you should close it with the close()
method:
Example
import java.io.FileWriter; // Import the FileWriter class
import java.io.IOException; // Import the IOException class to handle errors
public class WriteToFile {
public static void main(String[] args) {
try {
FileWriter myWriter = new FileWriter("filename.txt");
myWriter.write("Files in Java might be tricky, but it is fun enough!");
myWriter.close();
System.out.println("Successfully wrote to the file.");
} catch (IOException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}
The output will be:
Successfully wrote to the file.
Practice Excercise Practice now
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