Java BufferedWriter.close()方法範例

Java BufferedWriter.close()方法範例

BufferedWriter的Java BufferedWriter.close()方法的語法如下。

public void close()  throws IOException

範例

在下面的程式碼中展示了如何使用BufferedWriter.close()方法。

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;

public class Main {
  public static void main(String[] args) throws IOException {

    StringWriter sw = new StringWriter(); // From: Ｗｗ ｗ .y ｉＩ Ｂ AＩ  .ｃ ＯM 

    BufferedWriter bw = new BufferedWriter(sw);

    bw.append("tw511.com");

    bw.close();

    System.out.println(sw.getBuffer());

    // appending after closing will throw error
    bw.append("2");

    System.out.println(sw.getBuffer());

  }
}

上面的程式碼生成以下結果。

Exception in thread "main" tw511.com
java.io.IOException: Stream closed
    at java.io.BufferedWriter.ensureOpen(BufferedWriter.java:116)
    at java.io.BufferedWriter.write(BufferedWriter.java:221)
    at java.io.Writer.write(Writer.java:157)
    at java.io.Writer.append(Writer.java:227)
    at Main.main(Main.java:19)