Java StringReader markSupported()方法及示例

Java中StringReader类的markSupported()方法用于检查该StringReader是否支持mark()操作。它返回一个布尔值，说明该阅读器是否支持标记。

语法。

public boolean markSupported()

参数。该方法不接受任何参数

返回值。该方法返回一个布尔值，告诉你这个StringReader是否支持mark()操作。如果它支持markSupported，则返回true。否则，它返回false。

下面的方法说明了markSupported()方法的工作。

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2。

// 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: