Java CharBuffer length()用法及代码示例

java.nio.CharBuffer类的length()方法用于返回此字符缓冲区的长度。从字符序列看时，字符缓冲区的长度就是位置(含)和限制(不含)之间的字符数。也就是说，它等效于remaining()。

用法:

public final int length()

返回值：此方法返回此字符缓冲区的长度。

下面是说明length()方法的示例：

范例1：

// Java program to demonstrate 
// length() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declare and initialize the char array 
        char[] cb = { 'a', 'b', 'c' }; 
  
        // wrap the char array into CharBuffer 
        // using wrap() method 
        CharBuffer charBuffer = CharBuffer.wrap(cb); 
  
        // Get the length of the charBuffer 
        // using length() method 
        int length = charBuffer.length(); 
  
        // print the byte buffer 
        System.out.println("CharBuffer is:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nLength:"
                           + length); 
    } 
}

输出：

CharBuffer is:[a, b, c]
Length:3

范例2：

// Java program to demonstrate 
// length() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating CharBuffer 
        // using allocate() method 
        CharBuffer charBuffer 
            = CharBuffer.allocate(4); 
  
        // append char value in charBuffer 
        // using append() method 
        charBuffer.append('a'); 
        charBuffer.append('b'); 
  
        // print the char buffer 
        System.out.println("CharBuffer  before append:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nLength:"
                           + charBuffer.length()); 
  
        // append char value in charBuffer 
        // using append() method 
        charBuffer.append('c'); 
  
        // print the char buffer 
        System.out.println("\nCharBuffer after append:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nLength:"
                           + charBuffer.length()); 
    } 
}

输出：

CharBuffer  before append:[a, b,,  ]
Length:2

CharBuffer after append:[a, b, c,  ]
Length:1

参考： https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#length-

相关用法

注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 CharBuffer length() methods 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。