字符串编写器在 Java 中追加(CharSequence，int，int)方法，示例

原文:https://www . geeksforgeeks . org/stringwriter-appendcharsequence-int-int-method-in-Java-with-examples/

Java 中 StringWriter 类的追加(charSequence，int，int) 方法用于在编写器上追加指定 CharSequence 的指定部分。这个字符序列作为一个参数。要写入的起始索引和结束索引也作为参数。

语法:

public see append(charsequence charsequence，int startingIndex，int endingindex)

参数:该方法接受三个强制参数:

  • 字符序列是要写入流中的字符序列。
  • 起始索引是字符部分的起始索引。
  • endingIndex 是要写入写入器的结束索引。

返回值:此方法不返回值。

下面的程序说明了 append(CharSequence，int，int)方法的工作原理:

程序 1:

// Java program to demonstrate
// StringWriter append(CharSequence, int, int) method

import java.io.*;

class GFG {
    public static void main(String[] args)
    {

        try {

            // Create a StringWriter instance
            StringWriter writer
                = new StringWriter();

            // Get the charSequence
            // to be written in the writer
            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 writer
            // till it is printed on the console
            writer.append(charSequence,
                          startingIndex,
                          endingIndex);

            System.out.println(writer.toString());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

Geeks

程序 2:

// Java program to demonstrate
// StringWriter append(CharSequence, int, int) method

import java.io.*;

class GFG {
    public static void main(String[] args)
    {

        try {

            // Create a StringWriter instance
            StringWriter writer
                = new StringWriter();

            // Get the charSequence
            // to be written in the writer
            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 writer
            // till it is printed on the console
            writer.append(charSequence,
                          startingIndex,
                          endingIndex);

            System.out.println(writer.toString());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

G

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