Java ShortBuffer allocate()用法及代码示例

java.nio.ShortBuffer类的allocate()方法用于分配新的短缓冲区。

尽管标记未定义，但新缓冲区的位置将为零且其容量是其极限，并且每个元素都初始化为零。它将有一个支持数组，且数组偏移为零。

用法：

public static ShortBuffer allocate(int capacity)

参数：该方法接受强制性参数容量，以简写形式指定新缓冲区的容量。

返回值：此方法返回新的ShortBuffer。

异常：如果容量为负整数，则此方法引发IllegalArgumentException。

以下示例程序旨在说明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())); 
    } 
}

输出：

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

示例2:显示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); 
        } 
    } 
}

输出：

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

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

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注：本文由纯净天空筛选整理自IshwarGupta大神的英文原创作品 ShortBuffer allocate() method in Java With Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。