Java CharBuffer length()用法及代碼示例

java.nio.CharBuffer類的length()方法用於返回此字符緩衝區的長度。從字符序列看時，字符緩衝區的長度就是位置(含)和限製(不含)之間的字符數。也就是說，它等效於remaining()。

用法:

public final int length()

返回值：此方法返回此字符緩衝區的長度。

下麵是說明length()方法的示例：

範例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); 
    } 
}

輸出：

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

範例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()); 
    } 
}

輸出：

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

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

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

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 CharBuffer length() methods in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。