Java中的 BufferedReader close() 方法及示例

Java中BufferedReader类的close()方法用于关闭流并释放所有与流操作相关的系统资源。

句法：

public void close() 
            throws IOException

参数：此方法不接受任何参数。

返回值：此方法不返回任何值。

异常：如果发生 I/O 错误，此方法将抛出IOException 。

下面的程序说明了 IO 包中 BufferedReader 类中的 close() 方法：

程序1：假设文件“c:/demo.txt”存在。

// Java program to illustrate
// BufferedReader close() method
  
import java.io.*;
public class GFG {
    public static void main(String[] args)
        throws IOException
    {
  
        // Read stream file 'demo.txt'
        // containing text "GEEKSFORGEEKS"
        FileReader fileReader
            = new FileReader(
                "c:/demo.txt");
  
        // Convert fileReader to
        // bufferedReader
        BufferedReader buffReader
            = new BufferedReader(
                fileReader);
  
        // Call read() method
        while (buffReader.ready()) {
            System.out.print(
                (char)buffReader.read());
        }
  
        // Call close() method
        buffReader.close();
    }
}

输入：

输出：

程序2：假设文件“c:/demo.txt”存在。

// Java program to illustrate
// BufferedReader close() method
  
import java.io.*;
public class GFG {
    public static void main(String[] args)
        throws IOException
    {
        try {
  
            // Read stream file 'demo.txt'
            // containing text "GEEKSFORGEEKS"
            FileReader fileReader
                = new FileReader(
                    "c:/demo.txt");
  
            // Convert fileReader to
            // bufferedReader
            BufferedReader buffReader
                = new BufferedReader(
                    fileReader);
  
            // Call close() method
            buffReader.close();
  
            // Call read() method
            System.out.print(
                (char)buffReader.read());
        }
        catch (IOException e) {
            // Exception is thrown
            System.out.println(
                "BufferedReader is closed");
        }
    }
}

输入：

输出：

参考： https: Java/io/BufferedReader.html#close()