Java 中的 IntBuffer allocate()方法
原文:https://www . geesforgeks . org/int buffer-allocate-method-in-Java/
java.nio.IntBuffer 类的 allocate() 方法用于在现有缓冲区旁边分配一个新的 int buffer 。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 IntBuffer allocate(int capacity)
参数:该方法以新缓冲区的容量为参数，以 int 为单位。
返回值:该方法返回新的 int 缓冲区。
异常:如果容量为负整数，该方法抛出 IllegalArgumentException 。
下面的程序说明了 allocate()方法:
实施例 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 IntBuffer
int Capacity = 10;
// Creating the IntBuffer
// creating object of intbuffer
// and allocating size capacity
IntBuffer ib = IntBuffer.allocate(Capacity);
// putting the value in intbuffer
ib.put(11);
ib.put(2, 19);
System.out.println("IntBuffer: "
+ Arrays.toString(ib.array()));
}
}
Output:
IntBuffer: [11, 0, 19, 0, 0, 0, 0, 0, 0, 0]
示例 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 IntBuffer
// by negative integer
int Capacity = -10;
// Creating the IntBuffer
try {
// creating object of intbuffer
// and allocating size with negative integer
System.out.println("Trying to allocate a Negative Integer");
IntBuffer ib = IntBuffer.allocate(Capacity);
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
Trying to allocate a Negative Integer
Exception thrown: java.lang.IllegalArgumentException
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