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Description
Field Summary
Constructor Summary
Method Summary
Field Details
1. out
Constructor Details
Method Details

java.lang.Object

java.io.Writer

java.io.PrintWriter

All Implemented Interfaces:: Closeable, Flushable, Appendable, AutoCloseable

public class PrintWriter extends Writer

Prints formatted representations of objects to a text-output stream. This class implements all of the print methods found in PrintStream. It does not contain methods for writing raw bytes, for which a program should use unencoded byte streams.

Unlike the PrintStream class, if automatic flushing is enabled it will be done only when one 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().

This class always replaces malformed and unmappable character sequences with the charset's default replacement string. The CharsetEncoder class should be used when more control over the encoding process is required.

Since:: 1.1

Field Summary

Fields

Modifier and Type

Field

Description

protected Writer

out

The underlying character-output stream of this PrintWriter.

Fields declared in class java.io.Writer
lock
Constructor Summary

Constructors

Constructor

Description

PrintWriter(File file)

Creates a new PrintWriter, without automatic line flushing, with the specified file.

PrintWriter(File file, String csn)

Creates a new PrintWriter, without automatic line flushing, with the specified file and charset.

PrintWriter(File file, Charset charset)

Creates a new PrintWriter, without automatic line flushing, with the specified file and charset.

PrintWriter(OutputStream out)

Creates a new PrintWriter, without automatic line flushing, from an existing OutputStream.

PrintWriter(OutputStream out, boolean autoFlush)

Creates a new PrintWriter from an existing OutputStream.

PrintWriter(OutputStream out, boolean autoFlush, Charset charset)

Creates a new PrintWriter from an existing OutputStream.

PrintWriter(Writer out)

Creates a new PrintWriter, without automatic line flushing.

PrintWriter(Writer out, boolean autoFlush)

Creates a new PrintWriter.

PrintWriter(String fileName)

Creates a new PrintWriter, without automatic line flushing, with the specified file name.

PrintWriter(String fileName, String csn)

Creates a new PrintWriter, without automatic line flushing, with the specified file name and charset.

PrintWriter(String fileName, Charset charset)

Creates a new PrintWriter, without automatic line flushing, with the specified file name and charset.
Method Summary

All MethodsInstance MethodsConcrete Methods

Modifier and Type

Method

Description

PrintWriter

append(char c)

Appends the specified character to this writer.

PrintWriter

append(CharSequence csq)

Appends the specified character sequence to this writer.

PrintWriter

append(CharSequence csq, int start, int end)

Appends a subsequence of the specified character sequence to this writer.

boolean

checkError()

Flushes the stream if it's not closed and checks its error state.

protected void

clearError()

Clears the error state of this stream.

void

close()

Closes the stream and releases any system resources associated with it.

void

flush()

Flushes the stream.

PrintWriter

format(String format, Object... args)

Writes a formatted string to this writer using the specified format string and arguments.

PrintWriter

format(Locale l, String format, Object... args)

Writes a formatted string to this writer using the specified format string and arguments.

void

print(boolean b)

Prints a boolean value.

void

print(char c)

Prints a character.

void

print(char[] s)

Prints an array of characters.

void

print(double d)

Prints a double-precision floating-point number.

void

print(float f)

Prints a floating-point number.

void

print(int i)

Prints an integer.

void

print(long l)

Prints a long integer.

void

print(Object obj)

Prints an object.

void

print(String s)

Prints a string.

PrintWriter

printf(String format, Object... args)

A convenience method to write a formatted string to this writer using the specified format string and arguments.

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.

void

println(boolean x)

Prints a boolean value and then terminates the line.

void

println(char x)

Prints a character and then terminates the line.

void

println(char[] x)

Prints an array of characters and then terminates the line.

void

println(double x)

Prints a double-precision floating-point number and then terminates the line.

void

println(float x)

Prints a floating-point number and then terminates the line.

void

println(int x)

Prints an integer and then terminates the line.

void

println(long x)

Prints a long integer and then terminates the line.

void

println(Object x)

Prints an Object and then terminates the line.

void

println(String x)

Prints a String and then terminates the line.

protected void

setError()

Sets the error state of the stream to true.

void

write(char[] buf)

Writes an array of characters.

void

write(char[] buf, int off, int len)

Writes A Portion of an array of characters.

void

write(int c)

Writes a single character.

void

write(String s)

Writes a string.

void

write(String s, int off, int len)

Writes a portion of a string.

Methods declared in class java.io.Writer
nullWriter

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- out
  
  protected Writer out
  
  The underlying character-output stream of this PrintWriter.
  
  Since:
  
  1.2
Constructor Details
- PrintWriter
  
  public PrintWriter(Writer out)
  
  Creates a new PrintWriter, without automatic line flushing.
  
  Parameters:
  
  out - A character-output stream
- PrintWriter
  
  public PrintWriter(Writer out, boolean autoFlush)
  
  Creates a new PrintWriter.
  
  Parameters:
  
  out - A character-output stream
  
  autoFlush - A boolean; if true, the println, printf, or format methods will flush the output buffer
- PrintWriter
  public PrintWriter(OutputStream out)
  
  Creates a new PrintWriter, without automatic line flushing, from an existing OutputStream. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will convert characters into bytes using the default charset, or where out is a PrintStream, the charset used by the print stream.
  Parameters:
  
  out - An output stream
  
  See Also:
  OutputStreamWriter(OutputStream)
  
  Charset.defaultCharset()
- PrintWriter
  public PrintWriter(OutputStream out, boolean autoFlush)
  
  Creates a new PrintWriter from an existing OutputStream. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will convert characters into bytes using the default charset, or where out is a PrintStream, the charset used by the print stream.
  Parameters:
  
  out - An output stream
  
  autoFlush - A boolean; if true, the println, printf, or format methods will flush the output buffer
  
  See Also:
  OutputStreamWriter(OutputStream)
  
  Charset.defaultCharset()
- PrintWriter
  
  public PrintWriter(OutputStream out, boolean autoFlush, Charset charset)
  
  Creates a new PrintWriter from an existing OutputStream. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will convert characters into bytes using the specified charset.
  
  Parameters:
  
  out - An output stream
  
  autoFlush - A boolean; if true, the println, printf, or format methods will flush the output buffer
  
  charset - A charset
  
  Since:
  
  10
- PrintWriter
  public PrintWriter(String fileName) throws FileNotFoundException
  
  Creates a new PrintWriter, without automatic line flushing, with the specified file name. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will encode characters using the default charset for this instance of the Java virtual machine.
  Parameters:
  
  fileName - The name of the file to use as the destination of this writer. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.
  
  Throws:
  
  FileNotFoundException - If the given string does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file
  
  Since:
  
  1.5
  
  See Also:
  Charset.defaultCharset()
- PrintWriter
  
  public PrintWriter(String fileName, String csn) throws FileNotFoundException, UnsupportedEncodingException
  
  Creates a new PrintWriter, without automatic line flushing, with the specified file name and charset. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will encode characters using the provided charset.
  
  Parameters:
  
  fileName - The name of the file to use as the destination of this writer. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.
  
  csn - The name of a supported charset
  
  Throws:
  
  FileNotFoundException - If the given string does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file
  
  UnsupportedEncodingException - If the named charset is not supported
  
  Since:
  
  1.5
- PrintWriter
  
  public PrintWriter(String fileName, Charset charset) throws IOException
  
  Creates a new PrintWriter, without automatic line flushing, with the specified file name and charset. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will encode characters using the provided charset.
  
  Parameters:
  
  fileName - The name of the file to use as the destination of this writer. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.
  
  charset - A charset
  
  Throws:
  
  IOException - if an I/O error occurs while opening or creating the file
  
  Since:
  
  10
- PrintWriter
  public PrintWriter(File file) throws FileNotFoundException
  
  Creates a new PrintWriter, without automatic line flushing, with the specified file. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will encode characters using the default charset for this instance of the Java virtual machine.
  Parameters:
  
  file - The file to use as the destination of this writer. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.
  
  Throws:
  
  FileNotFoundException - If the given file object does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file
  
  Since:
  
  1.5
  
  See Also:
  Charset.defaultCharset()
- PrintWriter
  
  public PrintWriter(File file, String csn) throws FileNotFoundException, UnsupportedEncodingException
  
  Creates a new PrintWriter, without automatic line flushing, with the specified file and charset. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will encode characters using the provided charset.
  
  Parameters:
  
  file - The file to use as the destination of this writer. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.
  
  csn - The name of a supported charset
  
  Throws:
  
  FileNotFoundException - If the given file object does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file
  
  UnsupportedEncodingException - If the named charset is not supported
  
  Since:
  
  1.5
- PrintWriter
  
  public PrintWriter(File file, Charset charset) throws IOException
  
  Creates a new PrintWriter, without automatic line flushing, with the specified file and charset. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will encode characters using the provided charset.
  
  Parameters:
  
  file - The file to use as the destination of this writer. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.
  
  charset - A charset
  
  Throws:
  
  IOException - if an I/O error occurs while opening or creating the file
  
  Since:
  
  10
Method Details
- flush
  public void flush()
  
  Flushes the stream.
  Specified by:
  
  flush in interface Flushable
  
  Specified by:
  
  flush in class Writer
  
  See Also:
  checkError()
- close
  public void close()
  
  Closes the stream and releases any system resources associated with it. Closing a previously closed stream has no effect.
  Specified by:
  
  close in interface AutoCloseable
  
  Specified by:
  
  close in interface Closeable
  
  Specified by:
  
  close in class Writer
  
  See Also:
  checkError()
- checkError
  
  public boolean checkError()
  
  Flushes the stream if it's not closed and checks its error state.
  
  Returns:
  
  true if and only if this stream has encountered an IOException, or the setError method has been invoked
- setError
  
  protected void setError()
  
  Sets the error state of the stream to true.
  This method will cause subsequent invocations of checkError() to return true until clearError() is invoked.
- clearError
  
  protected void clearError()
  
  Clears the error state of this stream.
  This method will cause subsequent invocations of checkError() to return false until another write operation fails and invokes setError().
  
  Since:
  
  1.6
- write
  
  public void write(int c)
  
  Writes a single character.
  
  Overrides:
  
  write in class Writer
  
  Parameters:
  
  c - int specifying a character to be written.
- write
  
  public void write(char[] buf, int off, int len)
  
  Writes A Portion of an array of characters.
  
  Specified by:
  
  write in class Writer
  
  Parameters:
  
  buf - Array of characters
  
  off - Offset from which to start writing characters
  
  len - Number of characters to write
  
  Throws:
  
  IndexOutOfBoundsException - If the values of the off and len parameters cause the corresponding method of the underlying Writer to throw an IndexOutOfBoundsException
- write
  
  public void write(char[] buf)
  
  Writes an array of characters. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.
  
  Overrides:
  
  write in class Writer
  
  Parameters:
  
  buf - Array of characters to be written
- write
  
  public void write(String s, int off, int len)
  
  Writes a portion of a string.
  
  Overrides:
  
  write in class Writer
  
  Parameters:
  
  s - A String
  
  off - Offset from which to start writing characters
  
  len - Number of characters to write
  
  Throws:
  
  IndexOutOfBoundsException - If the values of the off and len parameters cause the corresponding method of the underlying Writer to throw an IndexOutOfBoundsException
- write
  
  public void write(String s)
  
  Writes a string. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.
  
  Overrides:
  
  write in class Writer
  
  Parameters:
  
  s - String to be written
- print
  public void print(boolean b)
  
  Prints a boolean value. The string produced by String.valueOf(boolean) is translated into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  b - The boolean to be printed
  
  See Also:
  Charset.defaultCharset()
- print
  public void print(char c)
  
  Prints a character. The character is translated into one or more bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  c - The char to be printed
  
  See Also:
  Charset.defaultCharset()
- print
  public void print(int i)
  
  Prints an integer. The string produced by String.valueOf(int) is translated into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  i - The int to be printed
  
  See Also:
  Integer.toString(int)
  
  Charset.defaultCharset()
- print
  public void print(long l)
  
  Prints a long integer. The string produced by String.valueOf(long) is translated into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  l - The long to be printed
  
  See Also:
  Long.toString(long)
  
  Charset.defaultCharset()
- print
  public void print(float f)
  
  Prints a floating-point number. The string produced by String.valueOf(float) is translated into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  f - The float to be printed
  
  See Also:
  Float.toString(float)
  
  Charset.defaultCharset()
- print
  public void print(double d)
  
  Prints a double-precision floating-point number. The string produced by String.valueOf(double) is translated into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  d - The double to be printed
  
  See Also:
  Double.toString(double)
  
  Charset.defaultCharset()
- print
  public void print(char[] s)
  
  Prints an array of characters. The characters are converted into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  s - The array of chars to be printed
  
  Throws:
  
  NullPointerException - If s is null
  
  See Also:
  Charset.defaultCharset()
- print
  public void print(String s)
  
  Prints a string. If the argument is null then the string "null" is printed. Otherwise, the string's characters are converted into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  s - The String to be printed
  
  See Also:
  Charset.defaultCharset()
- print
  public void print(Object obj)
  
  Prints an object. The string produced by the String.valueOf(Object) method is translated into bytes according to the default charset, and these bytes are written in exactly the manner of the write(int) method.
  Parameters:
  
  obj - The Object to be printed
  
  See Also:
  Object.toString()
  
  Charset.defaultCharset()
- println
  
  public void println()
  
  Terminates the current line by writing the line separator string. The line separator is System.lineSeparator() and is not necessarily a single newline character ('\n').
- println
  
  public void println(boolean x)
  
  Prints a boolean value and then terminates the line. This method behaves as though it invokes print(boolean) and then println().
  
  Parameters:
  
  x - the boolean value to be printed
- println
  
  public void println(char x)
  
  Prints a character and then terminates the line. This method behaves as though it invokes print(char) and then println().
  
  Parameters:
  
  x - the char value to be printed
- println
  
  public void println(int x)
  
  Prints an integer and then terminates the line. This method behaves as though it invokes print(int) and then println().
  
  Parameters:
  
  x - the int value to be printed
- println
  
  public void println(long x)
  
  Prints a long integer and then terminates the line. This method behaves as though it invokes print(long) and then println().
  
  Parameters:
  
  x - the long value to be printed
- println
  
  public void println(float x)
  
  Prints a floating-point number and then terminates the line. This method behaves as though it invokes print(float) and then println().
  
  Parameters:
  
  x - the float value to be printed
- println
  
  public void println(double x)
  
  Prints a double-precision floating-point number and then terminates the line. This method behaves as though it invokes print(double) and then println().
  
  Parameters:
  
  x - the double value to be printed
- println
  
  public void println(char[] x)
  
  Prints an array of characters and then terminates the line. This method behaves as though it invokes print(char[]) and then println().
  
  Parameters:
  
  x - the array of char values to be printed
- println
  
  public void println(String x)
  
  Prints a String and then terminates the line. This method behaves as though it invokes print(String) and then println().
  
  Parameters:
  
  x - the String value to be printed
- println
  
  public void println(Object x)
  
  Prints an Object and then terminates the line. This method calls at first String.valueOf(x) to get the printed object's string value, then behaves as though it invokes print(String) and then println().
  
  Parameters:
  
  x - The Object to be printed.
- printf
  public PrintWriter printf(String format, Object... args)
  A convenience method to write a formatted string to this writer using the specified format string and arguments. If automatic flushing is enabled, calls to this method will flush the output buffer.
  An invocation of this method of the form out.printf(format, args) behaves in exactly the same way as the invocation
  Copy [Copy snippet]
  out.format(format, args)
  Parameters:
  
  format - A format string as described in Format string syntax.
  
  args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java Virtual Machine Specification. The behaviour on a null argument depends on the conversion.
  
  Returns:
  
  This writer
  
  Throws:
  
  IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification.
  
  NullPointerException - If the format is null
  
  Since:
  
  1.5
- printf
  public 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. If automatic flushing is enabled, calls to this method will flush the output buffer.
  An invocation of this method of the form out.printf(l, format, args) behaves in exactly the same way as the invocation
  Copy [Copy snippet]
  out.format(l, format, args)
  Parameters:
  
  l - The locale to apply during formatting. If l is null then no localization is applied.
  
  format - A format string as described in Format string syntax.
  
  args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java Virtual Machine Specification. The behaviour on a null argument depends on the conversion.
  
  Returns:
  
  This writer
  
  Throws:
  
  IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification.
  
  NullPointerException - If the format is null
  
  Since:
  
  1.5
- format
  
  public PrintWriter format(String format, Object... args)
  
  Writes a formatted string to this writer using the specified format string and arguments. If automatic flushing is enabled, calls to this method will flush the output buffer.
  The locale always used is the one returned by Locale.getDefault(), regardless of any previous invocations of other formatting methods on this object.
  
  Parameters:
  
  format - A format string as described in Format string syntax.
  
  args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java Virtual Machine Specification. The behaviour on a null argument depends on the conversion.
  
  Returns:
  
  This writer
  
  Throws:
  
  IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the Formatter class specification.
  
  NullPointerException - If the format is null
  
  Since:
  
  1.5
- format
  
  public PrintWriter format(Locale l, String format, Object... args)
  
  Writes a formatted string to this writer using the specified format string and arguments. If automatic flushing is enabled, calls to this method will flush the output buffer.
  
  Parameters:
  
  l - The locale to apply during formatting. If l is null then no localization is applied.
  
  format - A format string as described in Format string syntax.
  
  args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java Virtual Machine Specification. The behaviour on a null argument depends on the conversion.
  
  Returns:
  
  This writer
  
  Throws:
  
  IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification.
  
  NullPointerException - If the format is null
  
  Since:
  
  1.5
- append
  public PrintWriter append(CharSequence csq)
  Appends the specified character sequence to this writer.
  An invocation of this method of the form out.append(csq) when csq is not null, behaves in exactly the same way as the invocation
  Copy [Copy snippet]
  out.write(csq.toString())
  Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.
  Specified by:
  
  append in interface Appendable
  
  Overrides:
  
  append in class Writer
  
  Parameters:
  
  csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.
  
  Returns:
  
  This writer
  
  Since:
  
  1.5
- append
  public PrintWriter append(CharSequence csq, int start, int end)
  Appends a subsequence of the specified character sequence to this writer.
  An invocation of this method of the form out.append(csq, start, end) when csq is not null, behaves in exactly the same way as the invocation
  Copy [Copy snippet]
  out.write(csq.subSequence(start, end).toString())
  Specified by:
  
  append in interface Appendable
  
  Overrides:
  
  append in class Writer
  
  Parameters:
  
  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:
  
  IndexOutOfBoundsException - If start or end are negative, start is greater than end, or end is greater than csq.length()
  
  Since:
  
  1.5
- append
  public PrintWriter append(char c)
  Appends the specified character to this writer.
  An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation
  Copy [Copy snippet]
  out.write(c)
  Specified by:
  
  append in interface Appendable
  
  Overrides:
  
  append in class Writer
  
  Parameters:
  
  c - The 16-bit character to append
  
  Returns:
  
  This writer
  
  Since:
  
  1.5

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Class PrintWriter

Field Summary

Fields declared in class java.io.Writer

Constructor Summary

Method Summary

Methods declared in class java.io.Writer

Methods declared in class java.lang.Object

Field Details

out

Constructor Details

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

PrintWriter

Method Details

flush

close

checkError

setError

clearError

write

write

write

write

write

print

print

print

print

print

print

print

print

print

println

println

println

println

println

println

println

println

println

println

printf

printf

format

format

append

append

append