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Unlike the PrintStream class, if ... of the println, printf, or format methods is invoked, rather than whenever a newline character happens to be output. These methods use the platform's own notion of line separator rather than the newline character. Methods in this class never throw I/O exceptions, although some of its constructors may. The client may inquire as to whether any errors have occurred by invoking checkError(). ... The underlying character-output stream of this PrintWriter...

Oracle

docs.oracle.com › javase › 8 › docs › api › java › io › PrintWriter.html

PrintWriter (Java Platform SE 8 )

March 16, 2026 - Unlike the PrintStream class, if ... of the println, printf, or format methods is invoked, rather than whenever a newline character happens to be output. These methods use the platform's own notion of line separator rather than the newline character. Methods in this class never throw I/O exceptions, although some of its constructors may. The client may inquire as to whether any errors have occurred by invoking checkError(). ... The underlying character-output stream of this PrintWriter...

Oracle

docs.oracle.com › en › java › javase › 21 › docs › api › java.base › java › io › PrintWriter.html

PrintWriter (Java SE 21 & JDK 21)

January 20, 2026 - PrintWriter · printf · (Locale l, String format, Object... args) A convenience method to write a formatted string to this writer using the specified format string and arguments. void · println() Terminates the current line by writing the line separator string.

GeeksforGeeks

geeksforgeeks.org › java › printwriter-printlnstring-method-in-java-with-examples

PrintWriter println(String) method in Java with Examples - GeeksforGeeks

July 11, 2025 - // Java program to demonstrate // PrintWriter println(String) method import java.io.*; class GFG { public static void main(String[] args) { try { // Create a PrintWriter instance PrintWriter writer = new PrintWriter(System.out); // Get the String // to be printed in the stream String string = "GFG"; // print the string // to this writer using print() method // This will put the string in the stream // till it is printed on the console writer.println(string); writer.flush(); } catch (Exception e) { System.out.println(e); } } }

Tutorialspoint

tutorialspoint.com › java › io › printwriter_println.htm

Java.io.PrintWriter.println() Method

package com.tutorialspoint; import java.io.*; public class PrintWriterDemo { public static void main(String[] args) { String s = "Hello world."; // create a new writer PrintWriter pw = new PrintWriter(System.out); // print string pw.print(s); // change the line twice pw.println(); pw.println(); // print another string pw.print("Two lines skipped."); // flush the writer pw.flush(); } }

Tabnine

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java.io.PrintWriter.println java code examples | Tabnine

String outputFullFilename = new ...tFullFilename); PrintWriter writer = null; try { writer = new PrintWriter(new FileOutputStream(outputFullFilename)); writer.format("package %s;\n\n", packageName); writer.println("public final class R {\n"); for (RType rType : rTypeResource...

Programiz

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Java PrintWriter (With Examples)

Note: The PrintWriter class also has a feature of auto flushing. This means it forces the writer to write all data to the destination if one of the println() or printf() methods is called.

Tutorialspoint

tutorialspoint.com › java › io › printwriter_println_char_array.htm

Java.io.PrintWriter.println( char[] x) Method

The java.io.PrintWriter.println() method prints an array of characters and then terminates the line. This method behaves as though it invokes print(char[]) and then println(). Following is the declaration for java.io.PrintWriter.println() method. ...

Stack Overflow

stackoverflow.com › questions › 39731347 › print-writer-write-and-println

java - Print Writer write() and println() - Stack Overflow

Top answer

1 of 2

the Printwriter.write() method just sends when I close the writer while the .println() method works fine

There seems there may be two problems here, the first having to do with writing and the second with reading:

The code creates a PrintWriter with automatic line flushing. When you use println, the new line results in the writer flushing. When using write without a new line, the PrintWriter does not flush (you can call out.flush after out.write to force a flush of the Writer).
Presuming the receiving end is using Scanner.readLine(), it expects a new line or will wait until it receives one. println automatically appends the new line to the end of the String, with write you must explicitly send the new line out.write(line + "\n");

2 of 2

Yes I've absolutely seen this before. If you are using a PrintWriter or another Writer that has autoflush, you do not need to call flush(). But otherwise, to get the message to send, you've got to call flush() to get the content in the Writer / OutputStream to send.

Microsoft Learn

learn.microsoft.com › en-us › dotnet › api › java.io.printwriter.println

PrintWriter.Println Method (Java.IO) | Microsoft Learn

Prints a String and then terminates the line. This method behaves as though it invokes #print(String) and then #println(). Java documentation for java.io.PrintWriter.println(java.lang.String).

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Codecademy

codecademy.com › docs › java › printwriter

Java | PrintWriter | Codecademy

August 17, 2024 - PrintWriter writer = new PrintWriter(new File("output.txt")); writer.println("Hello, world!"); writer.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } } } Copy to clipboard · Copy to clipboard ·

Oracle

docs.oracle.com › en › java › javase › 22 › docs › api › java.base › java › io › PrintWriter.html

PrintWriter (Java SE 22 & JDK 22)

July 16, 2024 - PrintWriter · printf · (Locale l, String format, Object... args) A convenience method to write a formatted string to this writer using the specified format string and arguments. void · println() Terminates the current line by writing the line separator string.

Baeldung

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PrintWriter vs. FileWriter in Java | Baeldung

December 1, 2023 - Here, we create a PrintWriter object which takes the file path as an argument. Next, we invoke the println() method on the PrintWriter object to write characters to the file.

GeeksforGeeks

geeksforgeeks.org › java › printwriter-println-method-in-java-with-examples

PrintWriter println() method in Java with Examples - GeeksforGeeks

July 11, 2025 - Below methods illustrates the working of println() method: Program 1: ... // Java program to demonstrate // PrintWriter println() method import java.io.*; class GFG { public static void main(String[] args) { try { // Create a PrintWriter instance PrintWriter writer = new PrintWriter(System.out); // Print the value 'GFG' // to this stream using print() method // This will put the in the // stream till it is printed on the console writer.print("GFG"); // Break the line in the stream // using println() method writer.println(); writer.flush(); } catch (Exception e) { System.out.println(e); } } }

Mpg

resources.mpi-inf.mpg.de › d5 › teaching › ss05 › is05 › javadoc › java › io › PrintWriter.html

java.io Class PrintWriter

Create a new PrintWriter from an existing OutputStream. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will convert characters into bytes using the default character encoding. Parameters: out - An output stream · autoFlush - A boolean; if true, the ...

Stack Overflow

stackoverflow.com › questions › 20722120 › system-out-println-vs-printwriter

java - System.out.println vs PrintWriter - Stack Overflow

Top answer

1 of 4

The main difference is that System.out is a PrintStream and the other one is a PrintWriter. Essentially, PrintStream should be used to write a stream of bytes, while PrintWriter should be used to write a stream of characters (and thus it deals with character encodings and such).

For most use cases, there is no difference.

2 of 4

System.out is instance of PrintStream

So your question narrows down to PrintStream vs PrintWriter

All characters printed by a PrintStream are converted into bytes using the platform's default character encoding. (Syso writes out directly to system output/console)
The PrintWriter class should be used in situations that require writing characters rather than bytes.

Oracle

docs.oracle.com › en › java › javase › 17 › docs › api › java.base › java › io › PrintWriter.html

PrintWriter (Java SE 17 & JDK 17)

Oracle

docs.oracle.com › en › java › javase › 26 › docs › api › java.base › java › io › PrintWriter.html

PrintWriter (Java SE 26 & JDK 26)

March 16, 2026 - PrintWriter · printf · (Locale l, String format, Object... args) A convenience method to write a formatted string to this writer using the specified format string and arguments. void · println() Terminates the current line by writing the line separator string.

Coderanch

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difference between PrintWriter.println and PrintWriter.write (I/O and Streams forum at Coderanch)

July 14, 2005 - public void println(String x) Print a String and then terminate the line. public void write(String s) Write a string. java.io.PrintWriter

GeeksforGeeks

geeksforgeeks.org › java › printwriter-printlnobject-method-in-java-with-examples

PrintWriter println(Object) method in Java with Examples - GeeksforGeeks

July 11, 2025 - Below methods illustrates the working of println(Object) method: Program 1: ... // Java program to demonstrate // PrintWriter println(Object) method import java.io.*; class GFG { public static void main(String[] args) { try { // Create a PrintWriter instance PrintWriter writer = new PrintWriter(System.out); // Get the char[] object // to be printed in the stream char[] object = { 'G', 'e', 'e', 'k', 's', 'F', 'o', 'r', 'G', 'e', 'e', 'k', 's' }; // print the object // to this writer using print() method // This will put the object in the stream // till it is printed on the console writer.println(object); writer.flush(); } catch (Exception e) { System.out.println(e); } } }