Java 中的推读关闭()方法，示例

原文:https://www . geesforgeks . org/puback reader-close-method-in-Java-with-examples/

Java 中 推回阅读器 类的 close() 方法用于关闭流并释放流中繁忙的资源(如果有)。该方法有以下结果:

  • If the stream is open, close the stream to release resources.
  • If the stream has been closed, it has no effect.
  • If the stream performs any reading or other similar operations, it will throw IOException when it is closed.

语法:

public void close()

参数:该方法不接受任何参数

返回值:此方法不返回值。

异常:如果输入输出时出现错误，该方法抛出异常。

下面的方法说明了 close()方法的工作原理:

程序 1:

// Java program to demonstrate
// PushbackReader close() method

import java.io.*;
import java.util.*;

class GFG {
    public static void main(String[] args)
    {

        try {
            String s = "GeeksForGeeks";

            // Initializing a StringReader and PushbackReader
            StringReader stringReader
                = new StringReader(s);
            PushbackReader pushbackReader
                = new PushbackReader(stringReader);

            System.out.println("Is stream ready: "
                               + pushbackReader.ready());

            // Close the stream using close()
            pushbackReader.close();
            System.out.println("Stream Closed.");
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

Is stream ready: true
Stream Closed.

程序二:

// Java program to demonstrate
// PushbackReader close() method

import java.io.*;
import java.util.*;

class GFG {
    public static void main(String[] args)
    {

        try {
            // Initializing a StringReader and PushbackReader
            String s = "GFG";

            StringReader stringReader
                = new StringReader(s);
            PushbackReader pushbackReader
                = new PushbackReader(stringReader);

            System.out.println("Is stream ready: "
                               + pushbackReader.ready());

            // Close the stream using close()
            pushbackReader.close();
            System.out.println("Stream Closed.");
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

Is stream ready: true
Stream Closed.

参考:https://docs . Oracle . com/javase/9/docs/API/Java/io/puback reader . html # close–

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