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Java FloatBuffer allocate()用法及代码示例


java.nio.FloatBuffer类的allocate()方法用于在现有缓冲区旁边分配一个新的float缓冲区。新缓冲区的位置将为零。它的极限将是它的容量。其标记将是不确定的。并且其每个元素都将初始化为零。它将有一个支持数组,其数组偏移量将为零。

用法:

public static FloatBuffer allocate(int capacity)

参数:此方法将新缓冲区的容量(以float表示)作为参数。


返回值:此方法返回新的float缓冲区。

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:

范例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 FloatBuffer 
        int capacity = 10; 
  
        // Creating the FloatBuffer 
  
        // creating object of floatbuffer 
        // and allocating size capacity 
        FloatBuffer fb = FloatBuffer.allocate(capacity); 
  
        // putting the value in floatbuffer 
        fb.put(8.56F); 
        fb.put(2, 9.61F); 
  
        System.out.println("FloatBuffer: "
                           + Arrays.toString(fb.array())); 
    } 
}
输出:
FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

范例2:演示IllegalArgumentException

// 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 FloatBuffer 
        // by negetive integer 
        int capacity = -10; 
  
        // Creating the FloatBuffer 
        try { 
  
            // creating object of floatbuffer 
            // and allocating size with negetive 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


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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 FloatBuffer 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。