Java中的 PrintWriter write(String, int, int) 方法及示例

Java中PrintWriter类的write(String, int, int)方法用于将指定 String 的指定部分写入流上。这个字符串被当作一个参数。要写入的 String 的起始索引和长度也作为参数。

句法：

public void write(String string, int startingIndex, int lengthOfstring)

参数：此方法接受三个强制参数：

• 字符串是要写入 Stream 的字符串。
• 起始索引，它是从中获取字符部分的起始索引。
• lengthOfstring是要写入流的 String 的长度。

返回值：此方法不返回任何值。

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

方案一：

// Java program to demonstrate
// PrintWriter write(String, 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 String
            // to be written in the stream
            String string = "GeeksForGeeks";
  
            // Get the starting index
            int startingIndex = 0;
  
            // Get the length of char
            int lengthOfstring = 5;
  
            // Write the portion of the string
            // to this writer using write() method
            // This will put the string in the stream
            // till it is printed on the console
            writer.write(string,
                         startingIndex,
                         lengthOfstring);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Geeks

方案二：

// Java program to demonstrate
// PrintWriter write(String, 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 String
            // to be written in the stream
            String string = "GFG";
  
            // Get the starting index
            int startingIndex = 2;
  
            // Get the length of char
            int lengthOfstring = 1;
  
            // Write the portion of the string
            // to this writer using write() method
            // This will put the string in the stream
            // till it is printed on the console
            writer.write(string,
                         startingIndex,
                         lengthOfstring);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

G