Java 中 StringReader markSupported()方法，示例

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

Java 中 StringReader 类的 markSupported() 方法，用来检查这个 StringReader 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 StringReader 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
// StringReader markSupported() method

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

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

        try {
            String str = "GeeksForGeeks";

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

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

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

输出:

Is StringReader markSupported: true

程序二:

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

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

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

        try {
            String str = "GeeksForGeeks";

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

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

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

输出:

Is StringReader markSupported: true

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

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