Java 中 CharArrayReader markSupported()方法，示例

原文:https://www . geeksforgeeks . org/chararrayreader-marksupported-method-in-Java-with-examples/

Java 中 CharArrayReader 类的 markSupported() 方法用来检查这个 CharArrayReader 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，告诉这个 CharArrayReader 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
// CharArrayReader markSupported() method

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

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

        try {

            char[] str = { 'G', 'e', 'e', 'k', 's',
                           'F', 'o', 'r',
                           'G', 'e', 'e', 'k', 's' };

            // Create a CharArrayReader instance
            CharArrayReader reader
                = new CharArrayReader(str);

            // Check if the CharArrayReader is
            // markSupported using markSupported()
            System.out.println("Is CharArrayReader markSupported: "
                               + reader.markSupported());

            reader.close();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

Is CharArrayReader markSupported: true

程序二:

// Java program to demonstrate
// CharArrayReader markSupported() method

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

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

        try {
            char[] str = { 'G', 'E', 'E', 'K', 'S' };

            // Create a CharArrayReader instance
            CharArrayReader reader
                = new CharArrayReader(str);

            // Check if the CharArrayReader is
            // markSupported using markSupported()
            System.out.println("Is CharArrayReader markSupported: "
                               + reader.markSupported());

            reader.close();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

Is CharArrayReader markSupported: true

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

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