Java Buffer capacity()用法及代碼示例

java.nio.Buffer類的capacity()方法用於返回此緩衝區的容量。

用法:

public final int capacity()

返回值：該緩衝區的容量

下麵是說明capacity()方法的示例：

範例1：

// Java program to demonstrate 
// capacity() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // creating object of ByteBuffer 
        // and allocating size capacity 
        ByteBuffer bb = ByteBuffer.allocate(7); 
  
        // putting the int to byte typecast 
        // value in ByteBuffer 
        bb.put((byte)20); 
        bb.put((byte)30); 
        bb.put((byte)40); 
        bb.put((byte)50); 
  
        // Typecasting ByteBuffer into Buffer 
        Buffer bb1 = (Buffer)bb; 
  
        // getting capacity of Buffer 
        // using capacity() method 
        int cap = bb1.capacity(); 
  
        // display the result 
        System.out.println("capacity is: "
                           + cap); 
    } 
}

輸出：

capacity is: 7

範例2：

// Java program to demonstrate 
// capacity() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // Declaring and initializing byte array 
        byte[] byt = { (byte)20, (byte)30, 
                       (byte)40, (byte)50, 
                       (byte)60 }; 
  
        // creating object of ByteBuffer 
        // and allocating size capacity 
        ByteBuffer bb = ByteBuffer.wrap(byt); 
  
        // Typecasting ByteBuffer into Buffer 
        Buffer bb1 = (Buffer)bb; 
  
        // getting capacity of Buffer 
        // using capacity() method 
        int cap = bb1.capacity(); 
  
        // display the result 
        System.out.println("capacity is: "
                           + cap); 
    } 
}

輸出：

capacity is: 5

參考： https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#capacity–

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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 Buffer capacity() method 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。