Java 中的 LongBuffer hasArray()方法
原文:https://www . geesforgeks . org/longbuffer-hasarray-method-in-Java/
类的数组()方法用于返回支持该缓冲区的长数组。对此缓冲区内容的修改将导致返回数组的内容被修改，反之亦然。Invoke()在调用此方法之前使用 hasArray()方法，以确保此缓冲区具有可访问的后备数组
语法:
public final Long[] array()
返回值:该方法返回支持该缓冲区的数组。
抛出:这个方法抛出readonlybufferenexception(如果这个缓冲区由数组支持，但是是只读的)
下面程序说明了数组()的方法:
实施例 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 LongBuffer
int capacity = 10;
// Creating the LongBuffer
try {
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put(7);
ib.put(2, 6);
ib.rewind();
// getting array from ib LongBuffer using array() method
long[] ibb = ib.array();
// prLonging the LongBuffer ib
System.out.println("LongBuffer: "
+ Arrays.toString(ibb));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
实施例 2:
// 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 ib
int capacity1 = 10;
// Declaring the capacity of the ib1
int capacity2 = 5;
// Creating the LongBuffer
try {
//
// ib
//
// creating object of Longbuffer ib
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity1);
// putting the value in ib
ib.put(7);
ib.put(2, 6);
ib.put(3, 7);
ib.rewind();
// prLong the LongBuffer
System.out.println("LongBuffer ib: "
+ Arrays.toString(ib.array()));
//
// ib1
//
// creating object of Longbuffer ib1
// and allocating size capacity
LongBuffer ib1 = LongBuffer.allocate(capacity2);
// putting the value in ib1
ib1.put(1, 4);
ib1.put(2, 6);
ib1.rewind();
// prLong the LongBuffer
System.out.println("\nLongBuffer ib1: "
+ Arrays.toString(ib1.array()));
// Creating a read-only copy of LongBuffer
// using asReadOnlyBuffer() method
LongBuffer readOnlyib = ib.asReadOnlyBuffer();
// prLong the LongBuffer
System.out.print("\nReadOnlyBuffer LongBuffer: ");
while (readOnlyib.hasRemaining())
System.out.print(readOnlyib.get() + ", ");
// try to change readOnlyib
System.out.println("\n\nTrying to get the array"
+ " from ReadOnlyib for editing");
long[] ibarr = readOnlyib.array();
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
版权属于：月萌API www.moonapi.com，转载请注明出处
