Java PipedReader close()用法及代碼示例

PipedReader類close()方法

• close() 方法可在java.io包。
• close() 方法用於關閉此 PipedReader 流並釋放與該流鏈接的所有係統資源。
• close() 方法是一個非靜態方法，它隻能通過類對象訪問，如果我們嘗試使用類名訪問方法，那麽我們將得到一個錯誤。
• close() 方法可能會在關閉流時拋出異常。
  IOException: 獲取任何輸入/輸出錯誤時可能會拋出此異常。

用法:

    public void close();

參數：

• 它不接受任何參數。

返回值：

該方法的返回類型是void，它什麽都不返回。

例：

// Java program to demonstrate the example 
// of void close() method of PipedReader

import java.io.*;

public class CloseOfPR {
    public static void main(String[] args) throws Exception {
        int val = 65;
        
        try {
            // Instantiates PipedReader and PipedWriter
            PipedWriter pipe_w = new PipedWriter();
            PipedReader pipe_r = new PipedReader();

            for (int i = 0; i < 3; ++i) {
                // By using write() method is to
                // write the val to the stream pipe_w
                pipe_w.write(val);
                val++;
            }

            // By using close() method is to close
            // the stream
            pipe_w.close();
            pipe_w.close();

            // When we call read() method after closing the
            // stream will result an exception
            for (int i = 0; i < 3; ++i) {
                // By using read() method is to
                // read the integer and convert it into
                // char
                char ch = (char) pipe_r.read();
                System.out.println("pipe_r.read():" + ch);
            }
        } catch (Exception ex) {
            System.out.println("Stream Closed Before!!!!");
        }
    }
}

輸出

Stream Closed Before!!!!