PrintWriter write(char[]) in Java

write(char[]): This method is available in the java.io.PrintWriter class of Java.

Syntax:

void java.io.PrintWriter.write(char[] buf)

This method takes one argument. This method writes an array of characters.

This method cannot be inherited from the Writer class because it must suppress I/O exceptions.

Parameters: One parameter is required for this method.

buf: Array of characters to be written.

Returns: NA

Exceptions:

1. NullPointerException- if cbuf is null.

Approach 1: When no exception

Java

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;

public class PrintWriterwrite {
    public static void main(String[] args) 
                   throws FileNotFoundException {
        File file = new File("D:\\hello.txt");
        PrintWriter printWriter = new PrintWriter(file);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e' };
        printWriter.write(cbuf);

        System.out.println("Successfully writes");
        printWriter.close();
    }
}

Output:

Successfully writes

Approach 2: NullPointerException

Java

package com.PrintWriter;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;

public class PrintWriterwrite {
    public static void main(String[] args) 
             throws FileNotFoundException {
        File file = new File("D:\\hello.txt");
        PrintWriter printWriter = new PrintWriter(file);

        char cbuf[] = null;
        printWriter.write(cbuf);

        System.out.println("Successfully writes");
        printWriter.close();
    }
}

Output:

Exception in thread "main" java.lang.NullPointerException: Cannot read the array length because "buf" is null
	at java.base/java.io.PrintWriter.write(PrintWriter.java:524)
	at com.PrintWriter.PrintWriterwrite.main(PrintWriterwrite.java:13)

Some other methods of PrintWriter

append(char): This method appends the specified character to this writer.

append(CharSequence): This method appends the specified character sequence to this writer.

append(CharSequence, int, int): This method appends a subsequence of the specified character sequence to this writer.

checkError(): This method flushes the stream if it's not closed and checks its error state.

close(): This method closes the stream and releases any system resources associated with it.

flush(): This method flushes the stream.

format(String, Object...): This method writes a formatted string to this writer using the specified format string and arguments.

format(Locale, String, Object...): This method writes a formatted string to this writer using the specified format string and arguments.

print(boolean): This method prints a boolean value.

printf(String, Object...): It is a convenient method to write a formatted string to this writer using the specified format string and arguments.

printf(Locale, String, Object...): It is a convenient method to write a formatted string to this writer using the specified format string and arguments.

println(): This method terminates the current line by writing the line separator string. 

PrintWriter(File): This method creates a new PrintWriter, without automatic line flushing, with the specified file.

PrintWriter(Writer, boolean): This method creates a new PrintWriter.

PrintWriter(OutputStream, boolean, Charset): This method creates a new PrintWriter from an existing OutputStream.

PrintWriter(OutputStream): This method creates a new PrintWriter, without automatic line flushing, from an existing OutputStream.

PrintWriter(String): This method creates a new PrintWriter, without automatic line flushing, with the specified file name.

PrintWriter(Writer): This method creates a new PrintWriter, without automatic line flushing.

PrintWriter(File, Charset): This method creates a new PrintWriter, without automatic line flushing, with the specified file and charset.

PrintWriter(File, String): This method creates a new PrintWriter, without automatic line flushing, with the specified file and charset.

PrintWriter(OutputStream, boolean): This method creates a new PrintWriter from an existing OutputStream.

PrintWriter(String, Charset): This method creates a new PrintWriter, without automatic line flushing, with the specified file name and charset.

PrintWriter(String, String): This method creates a new PrintWriter, without automatic line flushing, with the specified file name and charset.

write(char[]): This method writes an array of characters.

write(int): This method writes a single character.

write(String): This method writes a string

write(char[], int, int): This method writes A Portion of an array of characters.

write(String, int, int): This method writes a portion of a string.