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Java CharArrayReader read(char[], int, int)用法及代码示例

Java中CharArrayReader类的read(char [],int,int)方法用于将指定长度的字符以指定的偏移量读取到数组中。此方法将流阻塞到:

  • 它已从流中获取了一些输入。
  • 发生了一些IOException
  • 阅读时已到达流的末尾。

用法:

public int read(char[] charArray, int offset, int length)



参数:此方法接受三个强制参数:

  • charArray这是要写入流中的字符数组。
  • offset这是要在数组中写入字符的偏移量索引。
  • length这是要写入数组的字符数。

返回值:此方法返回一个整数值,该整数值是从流中读取的字符数。如果未读取任何字符,则返回-1。

异常:此方法引发以下异常:

  • IOException:输入输出时发生错误。
  • IndexOutOfBoundsException:如果偏移值不在字符数组范围内

以下方法说明了read(char [],int,int)方法的用法方式:

程序1:

// Java program to demonstrate 
// CharArrayReader read(char[], int, int) 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); 
  
            // Get the character array 
            // to be read from the stream 
            char[] charArray = new char[5]; 
  
            // Get the offset index 
            int offset = 0; 
  
            // Get the length 
            int length = 5; 
  
            // Read the charArray 
            // to this reader using read() method 
            // This will put the str in the stream 
            // till it is read by the reader 
            reader.read(charArray, offset, length); 
  
            // Print the read charArray 
            System.out.println( 
                Arrays.toString(charArray)); 
  
            reader.close(); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}
输出:
[G, e, e, k, s]

程序2:

// Java program to demonstrate 
// CharArrayReader read(char[], int, int) 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); 
  
            // Get the character array 
            // to be read from the stream 
            char[] charArray 
                = new char[13]; 
  
            // Get the offset index 
            int offset = 0; 
  
            // Get the length 
            int length = 13; 
  
            // Read the charArray 
            // to this reader using read() method 
            // This will put the str in the stream 
            // till it is read by the reader 
            reader.read(charArray, offset, length); 
  
            // Print the read charArray 
            System.out.println( 
                Arrays.toString(charArray)); 
  
            reader.close(); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}
输出:
[G, e, e, k, s, F, o, r, G, e, e, k, s]

参考:<a href =“ https://docs.oracle.com/javase/9​​/docs/api/java/io/CharArrayReader.html#read-char:A-int-int-” https://docs.oracle.com/javase/9 /docs /api /java /io /CharArrayReader.html#read-char:A-int-int-



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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 read(char[], int, int) method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文的传播和使用请遵循“署名-相同方式共享 4.0 国际 (CC BY-SA 4.0)”协议。