PrintStream dodaje funkcionalnost drugom izlaznom toku, odnosno mogućnost praktičnog ispisa prikaza različitih podatkovnih vrijednosti. Za razliku od drugih izlaznih tokova, PrintStream nikada ne baca IOException; umjesto toga iznimne situacije samo postavljaju internu zastavu koja se može testirati putem metode checkError. Opcionalno se može stvoriti PrintStream tako da se automatski ispire. Svi znakovi ispisani PrintStreamom pretvaraju se u bajtove pomoću zadanog kodiranja znakova platforme. Klasu PrintWriter treba koristiti u situacijama koje zahtijevaju pisanje znakova umjesto bajtova. Deklaracija klase
public class PrintStream extends FilterOutputStream implements Appendable Closeable
Polje
protected OutputStream out:This is the output stream to be filtered.
Konstruktori i opis
PrintStream(Datoteka datoteke):
Stvara novi tok ispisa bez automatskog ispiranja retka s navedenom datotekom.
PrintStream(File file String csn) :
Stvara novi tok ispisa bez automatskog ispiranja redaka s navedenom datotekom i skupom znakova.
PrintStream(OutputStream out) :
Stvara novi tok ispisa.
PrintStream(OutputStream out boolean autoFlush) :
Stvara novi tok ispisa.
PrintStream(OutputStream out boolean autoFlush kodiranje niza)
: Stvara novi tok ispisa.
PrintStream(String fileName):
Stvara novi tok ispisa bez automatskog ispiranja retka s navedenim nazivom datoteke.
PrintStream(String fileName String csn) :
Stvara novi tok ispisa bez automatskog ispiranja retka s navedenim nazivom datoteke i skupom znakova. Metode:
PrintStream add(char c) :
Appends the specified character to this output stream.
Syntax : public PrintStream append(char c) Parameters: c - The 16-bit character to append Returns: This output stream
PrintStream append(CharSequence csq int start int end):
Appends the specified character sequence to this output stream.
Syntax : public PrintStream append(CharSequence csq int start int end) Parameters: csq - The character sequence from which a subsequence will be appended. 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
PrintStream append(CharSequence csq) :
Appends a subsequence of the specified character sequence to this output stream.
Syntax : public PrintStream append(CharSequence csq) Parameters: csq - The character sequence to append. Returns: This output stream
boolean checkError():
Flushes the stream and checks its error state.
Syntax : public boolean checkError() Returns: true if and only if this stream has encountered an IOException other than InterruptedIOException or the setError method has been invoked
zaštićena praznina clearError() :
Clears the internal error state of this stream.
Syntax : protected void clearError()
void close() :
Closes the stream.
Syntax : public void close() Overrides: close in class FilterOutputStream
void flush():
Flushes the stream.
Syntax : public void flush() Overrides: flush in class FilterOutputStream
PrintStream format(Locale l String format Object... args):
Writes a formatted string to this output stream using the specified format string and arguments.
Syntax : public PrintStream format(Locale l String format Object... 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. The number of arguments is variable and may be zero. Returns: This output stream Throws: IllegalFormatException NullPointerException
PrintStream format (String format Object... args):
Writes a formatted string to this output stream using the specified format string and arguments.
Syntax : public PrintStream format(String format Object... args) Parameters : format - A format string as described in Format string syntax args - Arguments referenced by the format specifiers in the format string. The number of arguments is variable and may be zero. Returns: This output stream Throws: IllegalFormatException NullPointerException
void print(boolean b):
Prints a boolean value.
Syntax : public void print(boolean b)
void print(char c):
Prints a character.
Syntax : public void print(char c)
void print(char[] s):
Prints an array of characters.
Syntax : public void print(char[] s)
prazan ispis (dvostruko d) :
Prints a double-precision floating-point number.
Syntax : public void print(double b)
void print(float f):
Prints a floating-point number.
Syntax : public void print(float f)
void print(int i):
Prints an integer.
Syntax : public void print(int i)
prazan ispis (dugo l):
Prints a long integer.
Syntax : public void print(long l)
void print(Object obj):
Prints an object.
Syntax : public void print(Object obj)
void print(String s):
Prints a string.
Syntax : public void print(String s)
Java
importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importjava.io.PrintStream;importjava.util.Locale;//Java program to demonstrate PrintStream methodsclassPrintstream{publicstaticvoidmain(Stringargs[])throwsFileNotFoundException{FileOutputStreamfout=newFileOutputStream('file.txt');//creating Printstream objPrintStreamout=newPrintStream(fout);Strings='First';//writing to file.txtcharc[]={'G''E''E''K'};//illustrating print(boolean b) methodout.print(true);//illustrating print(int i) methodout.print(1);//illustrating print(float f) methodout.print(4.533f);//illustrating print(String s) methodout.print('GeeksforGeeks');out.println();//illustrating print(Object Obj) methodout.print(fout);out.println();//illustrating append(CharSequence csq) methodout.append('Geek');out.println();//illustrating checkError() methodout.println(out.checkError());//illustrating format() methodout.format(Locale.UK'Welcome to my %s program's);//illustrating flush methodout.flush();//illustrating close methodout.close();}}
Note: The output might not be visible on online IDE as it is not able to read the file. Izlaz:
true14.533GeeksforGeeks java.io.FileOutputStream@1540e19dGeek false Welcome to my First program
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