Java BufferedWriter flush()用法及代碼示例

Java中BufferedWriter類的flush()方法用於從緩衝的編寫器流中刷新字符。

用法:

public void flush()
            throws IOException

指定者：該方法由Flushable接口的flush()方法指定。

覆蓋：該方法覆蓋Writer類的flush()方法。

參數：此方法不接受任何參數。

返回值：此方法不返回任何值。

異常：如果發生I /O錯誤，則此方法將引發IOException。

以下示例程序旨在說明IO包中BufferedWriter類中的flush()方法：

程序1:

// Java program to illustrate 
// BufferedWriter flush() method 
  
import java.io.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IOException 
    { 
  
        // Create the string Writer 
        StringWriter stringWriter 
            = new StringWriter(); 
  
        // Convert stringWriter to 
        // bufferedWriter 
        BufferedWriter buffWriter 
            = new BufferedWriter( 
                stringWriter); 
  
        // Write "GEEKS" to buffer writer 
        buffWriter.write( 
            "GEEKSFORGEEKS", 0, 5); 
  
        // Flush the buffer writer 
        buffWriter.flush(); 
  
        System.out.println( 
            stringWriter.getBuffer()); 
    } 
}

輸出：

GEEKS

程序2:

// Java program to illustrate 
// BufferedWriter flush() method 
  
import java.io.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IOException 
    { 
        // Create the string Writer 
        StringWriter stringWriter 
            = new StringWriter(); 
  
        // Convert stringWriter to 
        // bufferedWriter 
        BufferedWriter buffWriter 
            = new BufferedWriter( 
                stringWriter); 
  
        // Write "GEEKS" to buffered writer 
        buffWriter.write( 
            "GEEKSFORGEEKS", 0, 5); 
  
        // Flush the buffered writer 
        buffWriter.flush(); 
  
        System.out.println( 
            stringWriter.getBuffer()); 
  
        // Write "GEEKSFORGEEKS" 
        // to buffered writer 
        buffWriter.write( 
            "GEEKSFORGEEKS", 5, 8); 
  
        // Flush the buffered writer 
        buffWriter.flush(); 
  
        System.out.println( 
            stringWriter.getBuffer()); 
    } 
}

輸出：

GEEKS
GEEKSFORGEEKS

參考文獻：
https://docs.oracle.com/javase/10/docs/api/java/io/BufferedWriter.html#flush()

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