Java 中的 LongBuffer allocate()方法
原文:https://www . geesforgeks . org/longbuffer-allocate-method-in-Java/
java.nio.LongBuffer 类的 allocate() 方法用于在现有缓冲区旁边分配一个新的长缓冲区。新缓冲区的位置将为零。它的极限将是它的容量。它的标记将是未定义的。它的每个元素都将被初始化为零。它将有一个后备数组，并且它的数组偏移量为零。 语法:
public static LongBuffer allocate(Long capacity)
参数:该方法以龙中新缓冲区的容量为参数。 返回值:此方法返回新的龙缓冲。 异常:如果容量为负数 Longer，此方法抛出IllegalArgumentException。 以下程序说明了 allocate()方法: 程序 1:
Java 语言(一种计算机语言，尤用于创建网站)
// 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 LongBuffer
int Capacity = 10;
// Creating the LongBuffer
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(Capacity);
// putting the value in Longbuffer
ib.put(11);
ib.put(2, 19);
System.out.println("LongBuffer: "
+ Arrays.toString(ib.array()));
}
}
Output:
LongBuffer: [11, 0, 19, 0, 0, 0, 0, 0, 0, 0]
程序 2: 演示非法文档异常
Java 语言(一种计算机语言，尤用于创建网站)
// 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 LongBuffer
// by negative Longer
int Capacity = -10;
// Creating the LongBuffer
try {
// creating object of Longbuffer
// and allocating size with negative Longer
System.out.println("Trying to allocate a Negative Longer");
LongBuffer ib = LongBuffer.allocate(Capacity);
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output
Trying to allocate a Negative Longer
Exception thrown: java.lang.IllegalArgumentException: capacity < 0: (-10 < 0)
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