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Java PushbackReader markSupported()用法及代码示例


Java中PushbackReader类的markSupported()方法用于检查此PushbackReader是否支持mark()操作。它返回一个布尔值,该状态指示是否标记了阅读器。

用法:

public boolean markSupported()

参数:此方法不接受任何参数


返回值:此方法返回一个布尔值,该值指示此PushbackReader是否支持mark()操作。如果为markSupported,则返回true。否则返回false。

下面的方法说明了markSupported()方法的用法方式:

示例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.

示例2:

// 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/PushbackReader.html#markSupported–



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注:本文由纯净天空筛选整理自srinam大神的英文原创作品 PushbackReader markSupported() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。