Java ShortBuffer allocate()用法及代碼示例

java.nio.ShortBuffer類的allocate()方法用於分配新的短緩衝區。

盡管標記未定義，但新緩衝區的位置將為零且其容量是其極限，並且每個元素都初始化為零。它將有一個支持數組，且數組偏移為零。

用法：

public static ShortBuffer allocate(int capacity)

參數：該方法接受強製性參數容量，以簡寫形式指定新緩衝區的容量。

返回值：此方法返回新的ShortBuffer。

異常：如果容量為負整數，則此方法引發IllegalArgumentException。

以下示例程序旨在說明allocate()方法的使用：

示例1:

// Java program to demonstrate 
// allocate() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ShortBuffer 
        int capacity = 5; 
  
        // Creating the ShortBuffer 
  
        // creating object of Shortbuffer 
        // and allocating size capacity 
        ShortBuffer sb = ShortBuffer.allocate(capacity); 
  
        // putting the value in Shortbuffer 
        sb.put((short)10000); 
        sb.put((short)10640); 
        sb.put((short)10189); 
        sb.put((short)-2000); 
        sb.put((short)-16780); 
  
        // Printing the ShortBuffer 
        System.out.println("ShortBuffer: "
                           + Arrays.toString(sb.array())); 
    } 
}

輸出：

ShortBuffer: [10000, 10640, 10189, -2000, -16780]

示例2:顯示NullPointerException

// Java program to demonstrate 
// allocate() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ShortBuffer 
        // by negetive integer 
        int capacity = -10; 
  
        // Creating the ShortBuffer 
        try { 
  
            // creating object of shortbuffer 
            // and allocating size with negative integer 
            System.out.println("Trying to allocate a negetive integer"); 
  
            FloatBuffer fb = FloatBuffer.allocate(capacity); 
        } 
        catch (IllegalArgumentException e) { 
            System.out.println("Exception thrown: " + e); 
        } 
    } 
}

輸出：

Trying to allocate a negetive integer
Exception thrown: java.lang.IllegalArgumentException

參考： https://docs.oracle.com/javase/7/docs/api/java/nio/ShortBuffer.html#allocate()

相關用法

注：本文由純淨天空篩選整理自IshwarGupta大神的英文原創作品 ShortBuffer allocate() 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。