java.lang.Object
- java.io.OutputStream
- - java.io.FilterOutputStream
  - - java.io.PrintStream

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

Direct Known Subclasses:

LogStream
```
public class PrintStream
extends FilterOutputStream
implements Appendable, Closeable
```
A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently. Two other features are provided as well. Unlike other output streams, a PrintStream never throws an IOException; instead, exceptional situations merely set an internal flag that can be tested via the checkError method. Optionally, a PrintStream can be created so as to flush automatically; this means that the flush method is automatically invoked after a byte array is written, one of the println methods is invoked, or a newline character or byte ('\n') is written.
All characters printed by a PrintStream are converted into bytes using the platform's default character encoding. The PrintWriter class should be used in situations that require writing characters rather than bytes.

Since:

JDK1.0

Field Summary
- Fields inherited from class java.io.FilterOutputStream out

Constructor Summary

Constructors
Constructor and Description
`PrintStream(File file)` Creates a new print stream, without automatic line flushing, with the specified file.
`PrintStream(File file, String csn)` Creates a new print stream, without automatic line flushing, with the specified file and charset.
`PrintStream(OutputStream out)` Creates a new print stream.
`PrintStream(OutputStream out, boolean autoFlush)` Creates a new print stream.
`PrintStream(OutputStream out, boolean autoFlush, String encoding)` Creates a new print stream.
`PrintStream(String fileName)` Creates a new print stream, without automatic line flushing, with the specified file name.
`PrintStream(String fileName, String csn)` Creates a new print stream, without automatic line flushing, with the specified file name and charset.

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Method Summary

Methods
Modifier and Type	Method and Description
`PrintStream`	`append(char c)` Appends the specified character to this output stream.
`PrintStream`	`append(CharSequence csq)` Appends the specified character sequence to this output stream.
`PrintStream`	`append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this output stream.
`boolean`	`checkError()` Flushes the stream and checks its error state.
`protected void`	`clearError()` Clears the internal error state of this stream.
`void`	`close()` Closes the stream.
`void`	`flush()` Flushes the stream.
`PrintStream`	`format(Locale l, String format, Object... args)` Writes a formatted string to this output stream using the specified format string and arguments.
`PrintStream`	`format(String format, Object... args)` Writes a formatted string to this output stream 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.
`PrintStream`	`printf(Locale l, String format, Object... args)` A convenience method to write a formatted string to this output stream using the specified format string and arguments.
`PrintStream`	`printf(String format, Object... args)` A convenience method to write a formatted string to this output stream 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 and then terminate the line.
`void`	`println(char x)` Prints a character and then terminate the line.
`void`	`println(char[] x)` Prints an array of characters and then terminate the line.
`void`	`println(double x)` Prints a double and then terminate the line.
`void`	`println(float x)` Prints a float and then terminate the line.
`void`	`println(int x)` Prints an integer and then terminate the line.
`void`	`println(long x)` Prints a long and then terminate the line.
`void`	`println(Object x)` Prints an Object and then terminate the line.
`void`	`println(String x)` Prints a String and then terminate the line.
`protected void`	`setError()` Sets the error state of the stream to `true`.
`void`	`write(byte[] buf, int off, int len)` Writes `len` bytes from the specified byte array starting at offset `off` to this stream.
`void`	`write(int b)` Writes the specified byte to this stream.

Erste Seite von API Java Inhaltsverzeichnis Haut

Methods inherited from class java.io.FilterOutputStream write

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

- Constructor Detail
  - PrintStream
    public PrintStream(OutputStream out)
    
    Creates a new print stream. This stream will not flush automatically.
    
    Parameters:
    out - The output stream to which values and objects will be printed
    See Also:
    PrintWriter.PrintWriter(java.io.OutputStream)
  - PrintStream
    public PrintStream(OutputStream out, boolean autoFlush)
    
    Creates a new print stream.
    
    Parameters:
    out - The output stream to which values and objects will be printed
    autoFlush - A boolean; if true, the output buffer will be flushed whenever a byte array is written, one of the println methods is invoked, or a newline character or byte ('\n') is written
    See Also:
    PrintWriter.PrintWriter(java.io.OutputStream, boolean)
  - PrintStream
    public PrintStream(OutputStream out, boolean autoFlush, String encoding) throws UnsupportedEncodingException
    
    Creates a new print stream.
    
    Parameters:
    out - The output stream to which values and objects will be printed
    autoFlush - A boolean; if true, the output buffer will be flushed whenever a byte array is written, one of the println methods is invoked, or a newline character or byte ('\n') is written
    encoding - The name of a supported character encoding
    
    Throws:
    
    UnsupportedEncodingException - If the named encoding is not supported
    Since:
    
    1.4
  - PrintStream
    public PrintStream(String fileName) throws FileNotFoundException
    
    Creates a new print stream, 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 print stream. 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
    
    SecurityException - If a security manager is present and checkWrite(fileName) denies write access to the file
    Since:
    
    1.5
  - PrintStream
    public PrintStream(String fileName, String csn) throws FileNotFoundException, UnsupportedEncodingException
    
    Creates a new print stream, 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 print stream. 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
    
    SecurityException - If a security manager is present and checkWrite(fileName) denies write access to the file
    
    UnsupportedEncodingException - If the named charset is not supported
    Since:
    
    1.5
  - PrintStream
    public PrintStream(File file) throws FileNotFoundException
    
    Creates a new print stream, 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 print stream. 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
    
    SecurityException - If a security manager is present and checkWrite(file.getPath()) denies write access to the file
    Since:
    
    1.5
  - PrintStream
    public PrintStream(File file, String csn) throws FileNotFoundException, UnsupportedEncodingException
    
    Creates a new print stream, 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 print stream. 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
    
    SecurityException - If a security manager is presentand checkWrite(file.getPath()) denies write access to the file
    
    UnsupportedEncodingException - If the named charset is not supported
    Since:
    
    1.5
- Method Detail
  - flush
    public void flush()
    
    Flushes the stream. This is done by writing any buffered output bytes to the underlying output stream and then flushing that stream.
    
    Specified by:
    
    flush in interface Flushable
    
    Overrides:
    
    flush in class FilterOutputStream
    
    See Also:
    OutputStream.flush()
  - close
    public void close()
    
    Closes the stream. This is done by flushing the stream and then closing the underlying output stream.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Overrides:
    
    close in class FilterOutputStream
    
    See Also:
    OutputStream.close()
  - checkError
    public boolean checkError()
    
    Flushes the stream and checks its error state. The internal error state is set to true when the underlying output stream throws an IOException other than InterruptedIOException, and when the setError method is invoked. If an operation on the underlying output stream throws an InterruptedIOException, then the PrintStream converts the exception back into an interrupt by doing:
    Thread.currentThread().interrupt();
    or the equivalent.
    
    Returns:
    true if and only if this stream has encountered an IOException other than InterruptedIOException, 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.
    
    Since:
    
    JDK1.1
  - clearError
    protected void clearError()
    
    Clears the internal 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 b)
    
    Writes the specified byte to this stream. If the byte is a newline and automatic flushing is enabled then the flush method will be invoked.
    Note that the byte is written as given; to write a character that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.
    
    Overrides:
    
    write in class FilterOutputStream
    
    Parameters:
    b - The byte to be written
    See Also:
    print(char), println(char)
  - write
    public void write(byte[] buf, int off, int len)
    
    Writes len bytes from the specified byte array starting at offset off to this stream. If automatic flushing is enabled then the flush method will be invoked.
    Note that the bytes will be written as given; to write characters that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.
    
    Overrides:
    
    write in class FilterOutputStream
    
    Parameters:
    buf - A byte array
    off - Offset from which to start taking bytes
    len - Number of bytes to write
    See Also:
    FilterOutputStream.write(int)
  - print
    public void print(boolean b)
    
    Prints a boolean value. The string produced by String.valueOf(boolean) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Parameters:
    b - The boolean to be printed
  - print
    public void print(char c)
    
    Prints a character. The character is translated into one or more bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Parameters:
    c - The char to be printed
  - print
    public void print(int i)
    
    Prints an integer. The string produced by String.valueOf(int) is translated into bytes according to the platform's default character encoding, 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)
  - print
    public void print(long l)
    
    Prints a long integer. The string produced by String.valueOf(long) is translated into bytes according to the platform's default character encoding, 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)
  - 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 platform's default character encoding, 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)
  - 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 platform's default character encoding, 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)
  - print
    public void print(char[] s)
    
    Prints an array of characters. The characters are converted into bytes according to the platform's default character encoding, 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
  - 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 platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Parameters:
    s - The String to be printed
  - 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 platform's default character encoding, 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()
  - println
    public void println()
    
    Terminates the current line by writing the line separator string. The line separator string is defined by the system property line.separator, and is not necessarily a single newline character ('\n').
  - println
    public void println(boolean x)
    
    Prints a boolean and then terminate the line. This method behaves as though it invokes print(boolean) and then println().
    
    Parameters:
    x - The boolean to be printed
  - println
    public void println(char x)
    
    Prints a character and then terminate the line. This method behaves as though it invokes print(char) and then println().
    
    Parameters:
    x - The char to be printed.
  - println
    public void println(int x)
    
    Prints an integer and then terminate the line. This method behaves as though it invokes print(int) and then println().
    
    Parameters:
    x - The int to be printed.
  - println
    public void println(long x)
    
    Prints a long and then terminate the line. This method behaves as though it invokes print(long) and then println().
    
    Parameters:
    x - a The long to be printed.
  - println
    public void println(float x)
    
    Prints a float and then terminate the line. This method behaves as though it invokes print(float) and then println().
    
    Parameters:
    x - The float to be printed.
  - println
    public void println(double x)
    
    Prints a double and then terminate the line. This method behaves as though it invokes print(double) and then println().
    
    Parameters:
    x - The double to be printed.
  - println
    public void println(char[] x)
    
    Prints an array of characters and then terminate the line. This method behaves as though it invokes print(char[]) and then println().
    
    Parameters:
    x - an array of chars to print.
  - println
    public void println(String x)
    
    Prints a String and then terminate the line. This method behaves as though it invokes print(String) and then println().
    
    Parameters:
    x - The String to be printed.
  - println
    public void println(Object x)
    
    Prints an Object and then terminate 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 PrintStream printf(String format, Object... args)
    
    A convenience method to write a formatted string to this output stream using the specified format string and arguments.
    An invocation of this method of the form out.printf(format, args) behaves in exactly the same way as the invocation
    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 output stream
    
    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 PrintStream printf(Locale l, String format, Object... args)
    
    A convenience method to write a formatted string to this output stream using the specified format string and arguments.
    An invocation of this method of the form out.printf(l, format, args) behaves in exactly the same way as the invocation
    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 output stream
    
    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 PrintStream format(String format, Object... args)
    
    Writes a formatted string to this output stream using the specified format string and arguments.
    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 output stream
    
    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 PrintStream format(Locale l, String format, Object... args)
    
    Writes a formatted string to this output stream using the specified format string and arguments.
    
    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 output stream
    
    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 PrintStream append(CharSequence csq)
    
    Appends the specified character sequence to this output stream.
    An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation
    out.print(csq.toString())
    
    Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking then 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
    
    Parameters:
    csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this output stream.
    
    Returns:
    This output stream
    Since:
    
    1.5
  - append
    public PrintStream append(CharSequence csq, int start, int end)
    
    Appends a subsequence of the specified character sequence to this output stream.
    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
    out.print(csq.subSequence(start, end).toString())
    
    Specified by:
    
    append in interface Appendable
    
    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 output stream
    
    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 PrintStream append(char c)
    
    Appends the specified character to this output stream.
    An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation
    out.print(c)
    
    Specified by:
    
    append in interface Appendable
    
    Parameters:
    c - The 16-bit character to append
    
    Returns:
    This output stream
    Since:
    
    1.5

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/io/PrintStream.html

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Referenzen

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Inhaltsverzeichnis Haut

Class PrintStream

Referenzen