Java BufferedWriter close()用法及代碼示例

Java中BufferedWriter類的close()方法用於從緩衝區流中清除字符，然後將其關閉。一旦關閉流，則進一步調用write()和append()之類的方法將引發異常。

用法:

public void close()

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close()方法：

程序1:

// Java program to illustrate 
// BufferedWriter close() method 
  
import java.io.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        try { 
  
            // 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); 
  
            // Close the buffered writer 
            buffWriter.close(); 
  
            System.out.println( 
                stringWriter.getBuffer()); 
        } 
        catch (Exception e) { 
            System.out.println( 
                "BufferedWriter is closed"); 
        } 
    } 
}

輸出：

GEEKS

程序2:

// Java program to illustrate 
// BufferedWriter close() method 
  
import java.io.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        try { 
  
            // 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); 
  
            // Close the buffered writer 
            buffWriter.close(); 
  
            System.out.println( 
                stringWriter.getBuffer()); 
  
            // It will throw exception 
            buffWriter.write( 
                "GEEKSFORGEEKS", 5, 8); 
        } 
        catch (Exception e) { 
            System.out.println( 
                "BufferedWriter is closed"); 
        } 
    } 
}

輸出：

GEEKS
BufferedWriter is closed

參考： https://docs.oracle.com/javase/7/docs/api/java/io/BufferedWriter.html#close()

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