Java 中的 ShortBuffer hasArray()方法，示例
原文:https://www . geesforgeks . org/short buffer-hasarray-method-in-Java-with-examples/
java.nio.ShortBuffer 类的 hasArray() 方法用于确保给定的缓冲区是否由可访问的浮点数组支持。如果该缓冲区有可访问的后备数组，则返回 true，否则返回 false。如果此方法返回 true，则可以安全地调用 array()和 arrayOffset()方法，因为它们在支持数组上工作。
语法:
public final boolean hasArray()
返回:当且仅当该缓冲区由数组支持且不是只读时，该方法将返回真。否则返回假。
以下是说明 hasArray() 方法的例子:
程序 1 : 当缓冲区由数组支持时。
// Java program to demonstrate
// hasArray() 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)256);
sb.put(2, (short)91);
sb.rewind();
// checking ShortBuffer sb is backed by array or not
boolean isArray = sb.hasArray();
// checking if else condition
if (isArray)
System.out.println("ShortBuffer sb is"
+ " backed by array");
else
System.out.println("ShortBuffer sb is"
+ " not backed by any array");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
ShortBuffer sb is backed by array
程序 2 : 当缓冲区没有数组支持时。
// Java program to demonstrate
// hasArray() 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)961);
sb.rewind();
// Creating a read-only copy of ShortBuffer
// using asReadOnlyBuffer() method
ShortBuffer sb1 = sb.asReadOnlyBuffer();
// checking ShortBuffer sb is backed by array or not
boolean isArray = sb1.hasArray();
// checking if else condition
if (isArray)
System.out.println("ShortBuffer sb is"
+ " backed by array");
else
System.out.println("ShortBuffer sb is"
+ " not backed by any array");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
ShortBuffer sb is not backed by any array
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