FileWriter FileWriter(File, boolean) in Java

FileWriter(File, boolean): This method is available in the java.io.FileWriter class of Java.

Syntax:

java.io.FileWriter.FileWriter(File file, boolean append) throws IOException

This method takes two arguments. This method constructs a FileWriter given the File to write and a boolean indicating whether to append the data written, using the platform's default charset.

Parameters: One parameter is required for this method.

file: the File to write.

append: if true, then bytes will be written to the end of the file rather than the beginning.

Throws:

IOException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason.

Approach 1: When no exception

Java

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class FileWriter4 {
    public static void main(String[] args) {

        String pathname = "D:\\hello.txt";
        File file = new File(pathname);
        boolean append = true;
        FileWriter fileWriter = null;
        try {
            fileWriter = new FileWriter(file, append);
        } catch (IOException e) {
            System.out.println("Error occured");
            return;
        }

        System.out.println(fileWriter);
    }
}

Output:

java.io.FileWriter@26f0a63f

Approach 2: IOException

Java

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class FileWriter4 {
    public static void main(String[] args) {

        String pathname = "D:\\hello2.txt";
        File file = new File(pathname);
        boolean append = true;
        FileWriter fileWriter = null;
        try {
            fileWriter = new FileWriter(file, append);
        } catch (IOException e) {
            System.out.println("Error occured");
            return;
        }

        System.out.println(fileWriter);
    }
}

Output:

Error occured

Some other methods of FileWriter.

FileWriter(File): This method constructs a FileWriter given the File to write, using the platform's default charset.

FileWriter(FileDescriptor): This method constructs a FileWriter given a file descriptor, using the platform's default charset.

FileWriter(String): This method constructs a FileWriter given a file name, using the platform's default charset.

FileWriter(File, Charset): This method constructs a FileWriter given the File to write and charset.

FileWriter(String, boolean): This method constructs a FileWriter given a file name and a boolean indicating whether to append the data written, using the platform's default charset.

FileWriter(String, Charset): This method constructs a FileWriter given a file name and charset.

FileWriter(String, Charset, boolean): This method constructs a FileWriter given a file name, charset, and a boolean indicating whether to append the data written.

FileWriter(File, Charset, boolean): This method constructs a FileWriter given the File to write, charset, and a boolean indicating whether to append the data written.