Java中的 PrintWriter write(char[], int, int) 方法及示例

Java中PrintWriter类的write(char[], int, int)方法用于将指定字符数组的指定部分写入流上。这个字符数组被作为一个参数。要写入的字符的起始索引和长度也作为参数。

句法：

public void write(char[] charArray, int startingIndex, int lengthOfCharArray)

参数：此方法接受三个强制参数：

• charArray是要写入 Stream 的字符数组。
• 起始索引，它是从中获取字符部分的起始索引。
• lengthOfCharArray是要写入流的字符的长度。

返回值：此方法不返回任何值。

下面的方法说明了 write(char[], int, int) 方法的工作：

方案一：

// Java program to demonstrate
// PrintWriter write(char[], int, int) method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a PrintWriter instance
            PrintWriter writer
                = new PrintWriter(System.out);
  
            // Get the character array
            // to be written in the stream
            char[] charArray = { 'G', 'e', 'e', 'k', 's',
                                 'F', 'o', 'r',
                                 'G', 'e', 'e', 'k', 's' };
  
            // Get the starting index
            int startingIndex = 0;
  
            // Get the length of char
            int lengthOfCharArray = 5;
  
            // Write the portion of the charArray
            // to this writer using write() method
            // This will put the charArray in the stream
            // till it is printed on the console
            writer.write(charArray,
                         startingIndex,
                         lengthOfCharArray);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Geeks

方案二：

// Java program to demonstrate
// PrintWriter write(char[], int, int) method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a PrintWriter instance
            PrintWriter writer
                = new PrintWriter(System.out);
  
            // Get the character array
            // to be written in the stream
            char[] charArray = { 'G', 'F', 'G' };
  
            // Get the starting index
            int startingIndex = 2;
  
            // Get the length of char
            int lengthOfCharArray = 1;
  
            // Write the portion of the charArray
            // to this writer using write() method
            // This will put the charArray in the stream
            // till it is printed on the console
            writer.write(charArray,
                         startingIndex,
                         lengthOfCharArray);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

G