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1. void clear() ;
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2. void clearBuffer() ;
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3. void close() ;
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4. void flush() ;
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5. int getBufferSize() ;
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6. int getRemaining() ;
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7. boolean isAutoFlush() ;
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8. void newLine() ;
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9. void print( boolean b ) ;
   void print( char c ) ;
   void print( char[] s ) ;
   void print( double d ) ;
   void print( float f ) ;
   void print( int i ) ;
   void print( long l ) ;
   void print( Object obj ) ;
   void print( String s ) ;
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10. void println( boolean b ) ;
    void println( char c ) ;
    void println( char[] s ) ;
    void println( double d ) ;
    void println( float f ) ;
    void println( int i ) ;
    void println( long l ) ;
    void println( Object obj ) ;
    void println( String s ) ;
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11. Appendable append( char c ) ;
    Appendable append( CharSequence cxq, int start, int end ) ;
    Appendable append( CharSequence cxq ) ;
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int DEFAULT_BUFFER = 0    - ȱʡ»º³åÇø´óС
int NO_BUFFER = -1        - writerÊÇ·ñ´¦ÓÚ»º³åÊä³ö״̬
int UNBOUNDED_BUFFER = -2 - ÊÇ·ñÏÞÖÆ»º³åÇø´óС
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