Java中的 StringWriter append(char) 方法及示例

Java中StringWriter类的append(char)方法用于在 writer 上追加指定的 char 值。这个 char 值被作为一个参数。

句法：

public void append(char charValue)

参数：此方法接受一个强制参数charValue ，它是要附加在写入器上的 char 值。

返回值：此方法不返回任何值。

下面的程序说明了 append(char) 方法的工作：

方案一：

// Java program to demonstrate
// StringWriter append(char) method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a StringWriter instance
            StringWriter writer
                = new StringWriter();
  
            // Append the char value 'A'
            // to this writer using append() method
            // This will put the charValue in the
            // writer till it is appended on the console
            writer.append('A');
  
            System.out.println(writer.toString());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

A

方案二：

// Java program to demonstrate
// StringWriter append(char) method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a StringWriter instance
            StringWriter writer
                = new StringWriter();
  
            // Append the char value 'G'
            // to this writer using append() method
            // This will put the charValue in the
            // writer till it is appended on the console
            writer.append('G');
  
            System.out.println(writer.toString());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

G