PrintWriter append(CharSequence, int, int) in Java

append(CharSequence, int, int): This method is available in the java.io.PrintWriter class of Java.

Syntax:

PrintWriter java.io.PrintWriter.append(CharSequence csq, int start, int end)

This method takes three arguments. This method appends a subsequence of the specified character sequence to this writer.

Parameters: Three parameters are required for this method.

csq: The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".

start: The index of the first character in the subsequence.

end: The index of the character following the last character in the subsequence.

Returns: This writer.

Throws:

1. IndexOutOfBoundsException - If start or end is negative, the start is greater than the end, or end is greater than csq.length().

Approach 1: When no exception

Java

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

public class PrintWriterappend3 {
    public static void main(String[] args) 
                    throws FileNotFoundException {
        File file = new File("D:\\hello.txt");
        PrintWriter printWriter = new PrintWriter(file);

        CharSequence csq = new String("Hello Java");
        int start = 0, end = 3;
        printWriter.append(csq, start, end);

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

Output:

Successfully appended

Approach 2: IndexOutOfBoundsException 

Java

package com.PrintWriter;

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

public class PrintWriterappend3 {
    public static void main(String[] args) 
                throws FileNotFoundException {
        File file = new File("D:\\hello.txt");
        PrintWriter printWriter = new PrintWriter(file);

        CharSequence csq = new String("Hello Java");
        int start = 0, end = 31;
        printWriter.append(csq, start, end);

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

Output:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: begin 0, end 31, length 10
	at java.base/java.lang.String.checkBoundsBeginEnd(String.java:3734)
	at java.base/java.lang.String.substring(String.java:1903)
	at java.base/java.lang.String.subSequence(String.java:1942)
	at java.base/java.io.PrintWriter.append(PrintWriter.java:1128)
	at com.PrintWriter.PrintWriterappend3.main(PrintWriterappend3.java:14)

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.