Java DataOutputStream writeChars（）方法及示例

DataOutputStream类writeChars()方法 (DataOutputStream Class writeChars() method)

writeChars() method is available in java.io package.
writeChars()方法在java.io包中可用。
writeChars() method is used to write the given string as a sequence of characters to the DataOutputStream.
writeChars()方法用于将给定的字符串作为字符序列写入DataOutputStream。
writeChars() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
writeChars()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
writeChars() method may throw an exception at the time of writing characters.
writeChars()方法在编写字符时可能会引发异常。

IOException: This exception may throw while getting any input/output error.
IOException ：在获取任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

    public final void writeChars(String str);

Parameter(s):

参数：

String str – represents the string value to be written to the data output stream.
字符串str –表示要写入数据输出流的字符串值。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void writeChars(String str) method 
// of DataOutputStream
import java.io.*;
public class WriteCharsOfDOS {
public static void main(String[] args) throws Exception {
InputStream is_stm = null;
DataInputStream dis_stm = null;
FileOutputStream fos_stm = null;
DataOutputStream dos_stm = null;
String str = "Java Programming...";
try {
// Instantiate FileInputStream, 
// DataInputStream, FileOutputStream
// and DataOutputStream 
fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
dos_stm = new DataOutputStream(fos_stm);
is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
dis_stm = new DataInputStream(is_stm);
// By using writeChars() method isto
// write chars value to the
// DataOutputStream dos_stm
dos_stm.writeChars(str);
// By using flush() method isto
// flush the bytes to the basic 
// output stream         
dos_stm.flush();
// Loop To Read Available Data till end
while (dis_stm.available() > 0) {
// By using readChar() method isto read 
// a char from dis_stm
char ch = dis_stm.readChar();
System.out.print(ch);
}
} catch (Exception ex) {
System.out.println(ex.toString());
} finally {
// To free system resources linked
// with these streams
if (is_stm != null)
is_stm.close();
if (dis_stm != null)
dis_stm.close();
if (dos_stm != null)
dos_stm.close();
if (fos_stm != null)
fos_stm.close();
}
}
}

Output

输出量