Java CharArrayWriter size()用法及代碼示例

Java中CharArrayWriter類的size()方法用於獲取緩衝區的當前大小。

用法：

public int size()

參數：此方法不接受任何參數。

返回值：此方法返回一個整數值，該值表示緩衝區的當前大小。

以下示例程序旨在說明上述方法：

示例1:

// Java program to illustrate 
// the size() method 
  
import java.io.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IOException 
    { 
  
        // Initailizing the character array 
        char[] geek = { 'G', 'E', 'E', 'K', 'S' }; 
  
        // Initailizing the CharArrayWriter 
        CharArrayWriter char_array1 
            = new CharArrayWriter(); 
  
        for (int c = 72; c < 77; c++) { 
            // Use of write(int char) 
            // Writer int value to the Writer 
            char_array1.write(c); 
        } 
  
        // Use of size() method 
        System.out.println("\nSize of char_array1 : "
                           + char_array1.size()); 
    } 
}

輸出：

Size of char_array1 : 5

示例2:

// Java program to illustrate 
// the size() method 
  
import java.io.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IOException 
    { 
  
        // Initailizing the character array 
        char[] geek 
            = { 'G', 'O', 'P', 'A', 'L', 'L' }; 
  
        // Initailizing the CharArrayWriter 
        CharArrayWriter char_array1 
            = new CharArrayWriter(); 
  
        for (int c = 72; c < 78; c++) { 
            // Use of write(int char) 
            // Writer int value to the Writer 
            char_array1.write(c); 
        } 
  
        // Use of size() method 
        System.out.println("\nSize of char_array1 : "
                           + char_array1.size()); 
    } 
}

輸出：

Size of char_array1 : 6

參考： https://docs.oracle.com/javase/10/docs/api/java/io/CharArrayWriter.html#size()

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