Java 中的 CharBuffer allocate()方法,示例
原文:https://www . geesforgeks . org/char buffer-allocate-method-in-Java-with-examples/
java.nio.CharBuffer 类的 allocate() 方法用于在现有缓冲区旁边分配一个新的 char 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 CharBuffer allocate(int capacity)
参数:该方法以 char 中新缓冲区的容量为参数。 返回值:该方法返回新的字符缓冲区。 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: 示例 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 CharBuffer
char capacity = 10;
// Creating the CharBuffer
// creating object of Charbuffer
// and allocating size capacity
CharBuffer fb = CharBuffer.allocate(capacity);
// putting the value in charbuffer
fb.put('a');
fb.put(3, 'b');
// Printing the CharBuffer
System.out.println("ChartBuffer: "
+ Arrays.toString(fb.array()));
}
}
Output:
ChartBuffer: [a, , , b, , , , , , ]
示例 2: 演示 IllegalArgumentException
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 CharBuffer
// by negative integer
int capacity = -10;
// Creating the CharBuffer
try {
// creating object of CharBuffer
// and allocating size with negative integer
System.out.println("Trying to allocate a negative integer");
CharBuffer fb = CharBuffer.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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