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📜  Java中的 PrintWriter append(CharSequence, int, int) 方法及示例

📅  最后修改于: 2022-05-13 01:55:47.248000             🧑  作者: Mango

Java中的 PrintWriter append(CharSequence, int, int) 方法及示例

Java中PrintWriter类的append(CharSequence, int, int)方法用于将指定 charSequence 的指定部分附加到流上。这个 charSequence 被当作一个参数。要写入的起始索引和结束索引也作为参数。

句法:

参数:此方法接受三个强制参数:

  • charSequence是要写入 Stream 的 charSequence。
  • 起始索引,它是从中获取字符部分的起始索引。
  • endingIndex是要写入流的结束索引。

返回值:此方法不返回任何值。

下面的方法说明了 append(CharSequence, int, int) 方法的工作:

方案一:

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

方案二:

// Java program to demonstrate
// PrintWriter append(CharSequence, 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 charSequence
            // to be written in the stream
            CharSequence charSequence = "GFG";
  
            // Get the starting index
            int startingIndex = 2;
  
            // Get the length of char
            int endingIndex = 3;
  
            // Write the portion of the charSequence
            // to this writer using append() method
            // This will put the charSequence in the stream
            // till it is printed on the console
            writer.append(charSequence,
                          startingIndex,
                          endingIndex);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}
输出:
G