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JAVA伊奥。作家班 是一个抽象类。它用于写入字符流。 宣言：
public abstract class Writer extends Object implements Appendable, Closeable, Flushable
施工人员：
- 受保护的写入程序（）： 创建一个新的字符流，该字符流本身可以在编写器上同步。
- 受保护的写入程序（对象obj）： 创建一个新的字符流，该字符流本身可以在给定对象“obj”上同步。
方法：
- write（int char）：java。伊奥。作家写入（int char） 将单个字符写入字符流。正在写入的字符包含在“char”整数值的16个低位中，其余16个高位被该方法忽略。 语法：
public void write(int char)Parameters : char : int value of the character to be written.Return :voidException :-> IOException : if in case I/O error occurs.
- write（String str）：java。伊奥。作家写入（字符串str） 将字符串写入字符流。 语法：
public void write(String str)Parameters : str : string to be written to the character stream.Return :voidException :-> IOException : if in case I/O error occurs.
- write（String str，int offset，int maxlen）：java。伊奥。作家写入（字符串str、int offset、int maxlen） 将字符串的某些部分写入字符流。 语法：
public void write(String str, int offset, int maxlen)Parameters : str : string to be written to the character stream.offset : start position of the Stringmaxlen : maximum length upto which string has to writtenReturn :voidException :-> IOException : if in case I/O error occurs.-> IndexOutOfBoundsException : if offset is -ve or offset + maxlen = -ve || > maxlen
- 写（char[]carray）：java。伊奥。作家写（char[]carray） 将字符数组写入字符流。 语法：
public void write(char[] carray)Parameters : carray : character array to be written to the character streamReturn :voidException :-> IOException : if in case I/O error occurs.
- 写（char[]carray，int offset，int maxlen）：java。伊奥。作家写入（字符[]carray，整数偏移，整数maxlen） 将字符数组的某些部分写入字符流。 语法：
public abstract void write(char[] carray, int offset, int maxlen)Parameters : carray : character to be written to the character streamoffset : start position of the character arraymaxlen : maximum no. of the character of the carray has to writtenReturn :voidException :-> IOException : if in case I/O error occurs.
- close（）：java。伊奥。作家关闭（） 关闭字符流，首先刷新它。 语法：
public abstract void close()Parameters : -----------Return :voidException :-> IOException : if in case I/O error occurs.
- flush（）：java。伊奥。作家同花顺 刷新Writer流。刷新一个流调用将刷新链中的所有其他缓冲区。 语法：
public void flush()Parameters : -----Return :voidException :-> IOException : if in case I/O error occurs.
- 演示Writer类方法使用的Java程序：
JAVA
// Java program illustrating the working of Writer class methods // write(int char), write(String str), close() // write(String str, int offset, int maxlen), flush() // write(char[] carray, int offset, int maxlen), write(char[] carray) import java.io.*; public class NewClass { public static void main(String[] args) throws IOException { char [] carray = { 'G' , 'E' , 'E' , 'K' , 'S' }; // Initializing Writer Writer geek_writer1 = new PrintWriter(System.out); Writer geek_writer2 = new PrintWriter(System.out); Writer geek_writer3 = new PrintWriter(System.out); Writer geek_writer4 = new PrintWriter(System.out); Writer geek_writer5 = new PrintWriter(System.out); // Use of write(int char) : to write a character geek_writer1.write( 71 ); geek_writer1.write( 70 ); geek_writer1.write( 71 ); // Use of flush() method System.out.print("Using write( int char []) : "); geek_writer1.flush(); String str = "Hello Geeks"; // Use of write(String str) : to write string geek_writer2.write(str); // Value written by write(String str) System.out.print("Using write(String str) : "); geek_writer2.flush(); // Use of write(String str, int offset, int maxlen) //: to write part of string geek_writer3.write(str, 2 , 4 ); geek_writer3.write(str, 5 , 6 ); // Value written by write(String str, int offset, int maxlen) System.out.print("Using write(str, offset, maxlen) : "); geek_writer3.flush(); geek_writer4.write(carray); System.out.print("Using write( char [] carray) : "); geek_writer4.flush(); // Use of write(char[] carray, int offset, int maxlen): // to write part of char array geek_writer5.write(carray, 1 , 3 ); // Value written by write(String str, int offset, int maxlen) System.out.print("Using write(carray, offset, maxlen) : "); geek_writer5.flush(); // Use of close() method geek_writer1.close(); geek_writer2.close(); geek_writer3.close(); geek_writer4.close(); geek_writer5.close(); } } |
- 输出：
Using write(int char[]) : GFGUsing write(String str) : Hello GeeksUsing write(str, offset, maxlen) : llo GeeksUsing write(char[] carray) : GEEKSUsing write(carray, offset, maxlen) : EEK
- append（char Sw）：java。伊奥。作家附加（字符Sw） 将单个字符附加到作者。 语法：
public Writer append(char Sw)Parameters : Sw : character to be appendReturn :WriterException :-> IOException : if in case I/O error occurs.
- append（CharSequence char_sq）：java。伊奥。作家追加（CharSequence char_sq） 将指定的字符序列追加到写入程序。 语法：
public Writer append(CharSequence char_sq)Parameters : char_sq : Character sequence to append. Return :Writer, if char sequence is null, then NULL appends to the Writer.Exception :-> IOException : if in case I/O error occurs.
- append（CharSequence char_sq，int start，int end）：java。伊奥。作家追加（字符序列char_sq，int start，int end） 将字符序列的指定部分追加到写入程序。 语法：
public Writer append(CharSequence char_sq, int start, int end)Parameters : char_sq : Character sequence to append.start : start of character in the Char Sequenceend : end of character in the Char SequenceReturn :voidException :-> IOException : if in case I/O error occurs.-> IndexOutOfBoundsException : if start or end are -ve or start > end or end > char_sq.length
- 演示Writer类方法使用的Java程序：
JAVA
// Java program illustrating the working of Writer class methods // append(CharSequence char_sq), append(char Sw) // append(CharSequence char_sq, int start,int end) // flush() import java.io.*; public class NewClass { public static void main(String[] args) throws IOException { // Initializing String Writer Writer geek_writer1 = new PrintWriter(System.out); Writer geek_writer2 = new PrintWriter(System.out); Writer geek_writer3 = new PrintWriter(System.out); // Use of write(int char) : to write a character geek_writer1.append( 'G' ); geek_writer1.append( 'G' ); geek_writer1.append( 'G' ); geek_writer1.append( 'G' ); geek_writer1.append( 'G' ); // Use of append(char Sw) System.out.print("append( char Sw) : "); geek_writer1.flush(); // Initializing Character Sequence CharSequence char_sq1 = " 1 Hello 1 "; CharSequence char_sq2 = " : 2 Geeks 2 "; // Use of append(CharSequence char_sq) geek_writer2.append(char_sq1); geek_writer2.append(char_sq2); System.out.print("append(char_sq) : "); geek_writer2.flush(); // Use of append(CharSequence char_sq,int start,int end) geek_writer3.append(char_sq1, 0 , 3 ); geek_writer3.append(char_sq2, 3 , 6 ); System.out.print("append(char_sq,start,end) : "); geek_writer3.flush(); } } |
- 输出：
Using write(int char) : GFGappend(char Sw) : GGGGGappend(char_sq) : 1 Hello 1 : 2 Geeks 2append(char_sq,start,end) : 1 H2 G
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