Java 中的推读复位()方法，示例

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

Java 中 推读类 的重置()方法用于重置流。在推送阅读器的情况下，该方法总是引发异常，因为推送阅读器不支持该方法。

语法:

public void reset()

参数:该方法不接受任何参数。

返回值:此方法不返回值。

异常:由于不支持 reset()方法，此方法总是引发 IOException。

下面的方法说明了 reset()方法的工作原理:

程序 1:

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

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

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

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

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

            // reset the stream position
            pushbackReader.reset();

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

输出:

java.io.IOException: mark/reset not supported

程序二:

// Java program to demonstrate
// PushbackReader reset() 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);

            // reset the stream position
            pushbackReader.reset();

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

输出:

java.io.IOException: mark/reset not supported

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

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