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大数据培训 | 大数据入门基础系列

发布百知教育 来源:学习课程 2019-11-18

1、企业开发里常用Writer类的成员方法


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Writer append(char c) ; 将指定字符添加到此 writer。 

 Writer append(CharSequence csq) ; 将指定字符序列添加到此 writer。 

 Writer append(CharSequence csq, int start, int end) ; 将指定字符序列的子序列添加到此 writer.Appendable。 

abstract  void close() ; 关闭此流,但要先刷新它。 

abstract  void flush() ;  刷新该流的缓冲。 

 void write(char[] cbuf) ; 写入字符数组。 

abstract  void write(char[] cbuf, int off, int len) ; 写入字符数组的某一部分。 

 void write(int c) ; 写入单个字符。 

 void write(String str) ; 写入字符串。 

 void write(String str, int off, int len) ;写入字符串的某一部分。 



2、企业开发里常用Writer 类的成员方法

 Writer  append(char  c);


Writer append(char c) ; 将指定字符添加到此 writer。 


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/** 
  @大数据躺过的坑【九月哥】所撰写
Writer append(char c) ; 将指定字符添加到此 writer。 
*/

public class WriterDemo {
   public static void main(String[] args{
      char c = 'A';

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // append a char
         writer.append('c');

         // append a new char
         writer.append(c);

         // flush the writer to see the result
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}


Let us compile and run the above program, this will produce the following result −


cA


3、企业开发里常用Writer 类的成员方法

 Writer  append(CharSequence  csq);


 Writer append(CharSequence csq) ; 将指定字符序列添加到此 writer。 


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/** 
  @大数据躺过的坑【九月哥】所撰写
 Writer append(CharSequence csq) ; 将指定字符序列添加到此 writer。 
*/

public class WriterDemo {
   public static void main(String[] args{
      CharSequence csq = "Hello World!";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // append a sequence and change line
         writer.append("This is an example\n");

         // flush the writer
         writer.flush();

         // append a new sequence
         writer.append(csq);

         // flush the writer to see the result
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

This is an example
Hello World!


4、企业开发里常用Writer 类的成员方法

 Writer  append(CharSequence  csq , int  start, int end);


 Writer append(CharSequence csq, int start, int end) ; 将指定字符序列的子序列添加到此 writer.Appendable。 


大数据培训


/** 
  @大数据躺过的坑【九月哥】所撰写
 Writer append(CharSequence csq, int start, int end) ; 
将指定字符序列的子序列添加到此 writer.Appendable。 
*/

public class WriterDemo {
   public static void main(String[] args{
      CharSequence csq = "Hello World!";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // append a subsequence and change line
         writer.append("This is an example\n"1119);

         // flush the writer
         writer.flush();

         // append a new subsequence
         writer.append(csq, 05);

         // flush the writer to see the result
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

example
Hello



5、企业开发里常用Writer 类的成员方法

 abstract void  close();


abstract  void close() ; 关闭此流,但要先刷新它。 


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/** 
  @大数据躺过的坑【九月哥】所撰写
abstract  void close() ; 关闭此流,但要先刷新它。 
*/

public class WriterDemo {
   public static void main(String[] args{
      String s = "Hello World";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // append a string
         writer.append(s);

         // flush the writer
         writer.flush();

         // append a new string
         writer.append("\nThis is an example");

         // flush and close the stream
         writer.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Hello World
This is an example


6、企业开发里常用Writer 类的成员方法

 abstract void  flush();


abstract  void flush() ;  刷新该流的缓冲。 


大数据培训


/** 
  @大数据躺过的坑【九月哥】所撰写
abstract  void flush() ;  刷新该流的缓冲。 
*/

public class WriterDemo {
   public static void main(String[] args{
      String s = "Hello World";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // append a string
         writer.append(s);

         // flush the writer
         writer.flush();

         // append a new string in a new line
         writer.append("\nThis is an example");

         // flush the stream again
         writer.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Hello World
This is an example


7、企业开发里常用Writer 类的成员方法

 void write(char[] cbuf);


void write(char[] cbuf) ; 写入字符数组。 


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/** 
  @大数据躺过的坑【九月哥】所撰写
 void write(char[] cbuf) ; 写入字符数组。 
*/

public class WriterDemo {
   public static void main(String[] args{
      char[] c1 = {'h''e''l''l''o'};
      char[] c2 = {'w''o''r''l''d'};

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // write a char array
         writer.write(c1);

         // flush the writer
         writer.flush();

         // write a new char array
         writer.write(c2);

         // flush the stream again
         writer.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

helloworld


8、企业开发里常用Writer 类的成员方法

 abstract void write(char[] cbuf, int off ,  int  len);


abstract  void write(char[] cbuf, int off, int len) ; 写入字符数组的某一部分。 


大数据培训


/** 
  @大数据躺过的坑【九月哥】所撰写
abstract  void write(char[] cbuf, int off, int len) ; 写入字符数组的某一部分。 
*/

public class WriterDemo {
   public static void main(String[] args{
      char[] c = {'h''e''l''l''o''w''o''r''l''d'};

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // write a portion of a char array
         writer.write(c, 05);

         // flush the writer
         writer.flush();

         // write another portion of a char array
         writer.write(c, 55);

         // flush the stream again
         writer.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

helloworld


9、企业开发里常用Writer 类的成员方法

 void write(int c);


 void write(int c) ; 写入单个字符。 


大数据培训


/** 
  @大数据躺过的坑【九月哥】所撰写
 void write(int c) ; 写入单个字符。 
*/

public class WriterDemo {
   public static void main(String[] args{
      int c = 70;

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // write an int that will be printed as ASCII
         writer.write(c);

         // flush the writer
         writer.flush();

         // write another int that will be printed as ASCII
         writer.write(71);

         // flush the stream again
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

FG


10、企业开发里常用Writer 类的成员方法

 void write(String str);


 void write(String str) ; 写入字符串。


大数据培训


/** 
  @大数据躺过的坑【九月哥】所撰写
 void write(String str) ; 写入字符串。 
*/

public class WriterDemo {
   public static void main(String[] args{
      String str = "Hello world!";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // write a string
         writer.write(str);

         // flush the writer
         writer.flush();

         // change line and write another string
         writer.write("\nThis is an example");

         // flush the stream again
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Hello world!
This is an example


11、企业开发里常用Writer 类的成员方法

 void write(String str ,int off ,int len);


void write(String str, int off, int len) ;写入字符串的某一部分。 


大数据培训


/** 
  @大数据躺过的坑【九月哥】所撰写
 void write(String str, int off, int len) ;写入字符串的某一部分。 
*/

public class WriterDemo {
   public static void main(String[] args{
      String str = "Hello world!";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // write a string portion
         writer.write(str, 05);

         // flush the writer
         writer.flush();

         // write another string portion
         writer.write(str, 56);

         // flush the stream again
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Hello world


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