Java CharArrayReader ready()用法及代码示例

Java中CharArrayReader类的ready()方法用于检查此CharArrayReader是否已准备好被读取。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CharArrayReader是否已准备好被读取。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 
// CharArrayReader ready() method 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        try { 
  
            char[] str = { 'G', 'e', 'e', 'k', 's', 
                           'F', 'o', 'r', 
                           'G', 'e', 'e', 'k', 's' }; 
  
            // Create a CharArrayReader instance 
            CharArrayReader reader 
                = new CharArrayReader(str); 
  
            // Check if the CharArrayReader is 
            // ready to be read using ready() 
            System.out.println("Is CharArrayReader ready "
                               + "to be read: "
                               + reader.ready()); 
  
            // Get the character 
            // to be read from the stream 
            int ch; 
  
            // Read the first 5 characters 
            // to this reader using read() method 
            // This will put the str in the stream 
            // till it is read by the reader 
            for (int i = 0; i < 5; i++) { 
                ch = reader.read(); 
                System.out.println("\nInteger value "
                                   + "of character read: "
                                   + ch); 
                System.out.println("Actual "
                                   + "character read: "
                                   + (char)ch); 
            } 
  
            reader.close(); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

输出：

Is CharArrayReader ready to be read: true

Integer value of character read: 71
Actual character read: G

Integer value of character read: 101
Actual character read: e

Integer value of character read: 101
Actual character read: e

Integer value of character read: 107
Actual character read: k

Integer value of character read: 115
Actual character read: s

程序2:

// Java program to demonstrate 
// CharArrayReader ready() method 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        try { 
            char[] str = { 'G', 'e', 'e', 'k', 's', 
                           'F', 'o', 'r', 
                           'G', 'e', 'e', 'k', 's' }; 
  
            // Create a CharArrayReader instance 
            CharArrayReader reader 
                = new CharArrayReader(str); 
  
            reader.close(); 
  
            // Check if the CharArrayReader is 
            // ready to be read using ready() 
            System.out.println("Is CharArrayReader ready "
                               + "to be read: "
                               + reader.ready()); 
  
            // Get the character 
            // to be read from the stream 
            int ch; 
  
            // Read the first character 
            // to this reader using read() method 
            // This will put the str in the stream 
            // till it is read by the reader 
            ch = reader.read(); 
            System.out.println("\nInteger value "
                               + "of character read: "
                               + ch); 
            System.out.println("Actual "
                               + "character read: "
                               + (char)ch); 
  
            reader.close(); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

输出：

java.io.IOException: Stream closed

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

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注：本文由纯净天空筛选整理自Code_r大神的英文原创作品 CharArrayReader 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。