Java PushbackReader ready()用法及代码示例

Java中的PushbackReader类的ready()方法用于检查此PushbackReader是否准备就绪。它返回一个布尔值，该值指示阅读器是否准备就绪。

用法:

public void ready()

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是否准备好被读取。如果准备就绪，则返回true。否则返回false。

异常：如果输入输出时发生某些错误，则此方法将引发IOException。

下面的方法说明了ready()方法的用法方式：

程序1:

// Java program to demonstrate 
// PushbackReader ready() 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 PushbackReader is 
            // ready to be read using ready() 
            System.out.println("Is PushbackReader ready "
                               + "to be read: "
                               + pushbackReader.ready()); 
  
            // Close the stream using ready() 
            pushbackReader.close(); 
            System.out.println("Stream Closed."); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

输出：

Is PushbackReader ready to be read: true
Stream Closed.

程序2:

// Java program to demonstrate 
// PushbackReader ready() 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 PushbackReader is 
            // ready to be read using ready() 
            System.out.println("Is PushbackReader ready "
                               + "to be read: "
                               + pushbackReader.ready()); 
  
            // Close the stream 
            pushbackReader.close(); 
            System.out.println("Stream Closed."); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

输出：

Is PushbackReader ready to be read: true
Stream Closed.

参考： https://docs.oracle.com/javase/9/docs/api/java/io/PushbackReader.html#ready-

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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 ready() 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。