Java Reader markSupported()用法及代碼示例

Java中Reader類的markSupported()方法用於檢查此Reader是否支持mark()操作。它返回一個布爾值，該狀態指示是否標記了閱讀器。

用法:

public boolean markSupported()

參數：此方法不接受任何參數

返回值：此方法返回一個布爾值，該值指示此Reader是否支持mark()操作。如果為markSupported，則返回true。否則返回false。

下麵的方法說明了markSupported()方法的用法方式：

示例1:

// Java program to demonstrate 
// Reader markSupported() method 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        try { 
  
            String str = "GeeksForGeeks"; 
  
            // Create a Reader instance 
            Reader reader 
                = new StringReader(str); 
  
            // Check if the Reader is 
            // markSupported using markSupported() 
            System.out.println("Is Reader markSupported: "
                               + reader.markSupported()); 
  
            reader.close(); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Is Reader markSupported: true

示例2:

// Java program to demonstrate 
// Reader 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 Reader instance 
            Reader reader 
                = new CharArrayReader(str); 
  
            // Check if the Reader is 
            // markSupported using markSupported() 
            System.out.println("Is Reader markSupported: "
                               + reader.markSupported()); 
  
            reader.close(); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Is Reader markSupported: true

參考： https://docs.oracle.com/javase/9/docs/api/java/io/Reader.html#markSupported–

相關用法

注：本文由純淨天空篩選整理自Code_r大神的英文原創作品 Reader markSupported() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。