推回阅读器标记支持的()方法，带示例

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

Java 中 推回阅读器类 的 markSupported() 方法，用来检查这个推回阅读器是否支持 mark()操作。它返回一个布尔值，该值表示读取器是否被标记为受支持。

语法:

public boolean markSupported()

参数:该方法不接受任何参数

返回值:这个方法返回一个布尔值，这个值告诉这个推读器是否支持 mark()操作。如果它是 markSupported，则返回 true。否则返回假。

下面的方法说明了 markSupported()方法的工作原理:

程序 1:

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

            // check if the mark() method
            // is supported or not
            System.out.println("Is mark() supported:"
                               + pushbackReader.markSupported());

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

输出:

Is mark() supported:false
Stream Closed.

程序二:

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

            // check if the mark() method
            // is supported or not
            System.out.println("Is mark() supported:"
                               + pushbackReader.markSupported());

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

输出:

Is mark() supported:false
Stream Closed.

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

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