Java 中的 ShortBuffer 数组()方法，示例
原文:https://www . geesforgeks . org/short buffer-array-in-Java-method-with-examples/
java.nio.ShortBuffer 的数组()方法用于返回支持该缓冲区的短数组(可选)。 修改该缓冲区的内容将导致返回数组的内容被修改，反之亦然。 在调用这个方法之前调用 hasArray 方法，以确保这个缓冲区有一个可访问的后备数组。
语法:
public final short[] array()
参数:该方法不取任何参数。
返回值:该方法返回备份缓冲区的数组。
例外:
- readonlybufferenexception，如果缓冲区由数组支持但为只读
- 不支持操作异常，如果此缓冲区没有可访问的阵列支持
< 下面的程序说明了数组()方法的使用:
程序 1 :
// Java program to demonstrate
// array() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ShortBuffer
int capacity = 10;
// Creating the ShortBuffer
try {
// creating object of Shortbuffer
// and allocating size capacity
ShortBuffer sb = ShortBuffer.allocate(capacity);
// putting the value in Shortbuffer
sb.put((short)856);
sb.put(2, (short)9);
sb.rewind();
// getting array from fb ShortBuffer using array() method
short[] sbb = sb.array();
// printing the ShortBuffer fb
System.out.println("ShortBuffer: "
+ Arrays.toString(sbb));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
ShortBuffer: [856, 0, 9, 0, 0, 0, 0, 0, 0, 0]
程序 2 :显示 ReadOnlyBufferException
// Java program to demonstrate
// array() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the sb
int capacity1 = 10;
// Declaring the capacity of the sb1
int capacity2 = 5;
// Creating the ShortBuffer
try {
//
// sb
//
// creating object of Shortbuffer sb
// and allocating size capacity
ShortBuffer sb = ShortBuffer.allocate(capacity1);
// putting the value in sb
sb.put((short)96);
sb.put(2, (short)7);
sb.put(3, (short)41);
sb.rewind();
// print the ShortBuffer
System.out.println("ShortBuffer sb: "
+ Arrays.toString(sb.array()));
//
// sb1
//
// creating object of Shortbuffer sb1
// and allocating size capacity
ShortBuffer sb1 = ShortBuffer.allocate(capacity2);
// putting the value in sb1
sb1.put(1, (short)445);
sb1.put(2, (short)64);
sb1.rewind();
// print the ShortBuffer
System.out.println("\nShortBuffer sb1: "
+ Arrays.toString(sb1.array()));
// Creating a read-only copy of ShortBuffer
// using asReadOnlyBuffer() method
ShortBuffer readOnlysb = sb.asReadOnlyBuffer();
// print the ShortBuffer
System.out.print("\nReadOnlyBuffer ShortBuffer: ");
while (readOnlysb.hasRemaining())
System.out.print(readOnlysb.get() + ", ");
// try to change readOnlysb
System.out.println("\n\nTrying to get the array"
+ " from ReadOnlysb for editing");
short[] sbarr = readOnlysb.array();
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
ShortBuffer sb: [96, 0, 7, 41, 0, 0, 0, 0, 0, 0]
ShortBuffer sb1: [0, 445, 64, 0, 0]
ReadOnlyBuffer ShortBuffer: 96, 0, 7, 41, 0, 0, 0, 0, 0, 0,
Trying to get the array from ReadOnlysb for editing
Exception thrown: java.nio.ReadOnlyBufferException
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