Java LongBuffer hasArray()用法及代码示例

java.nio.LongBuffer类的array()方法用于返回支持此缓冲区的Long数组。对该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，先使用hasArray()方法，以确保此缓冲区具有可访问的后备数组

用法:

public final Long[] array()

返回值：此方法返回支持此缓冲区的数组。

抛出：此方法抛出ReadOnlyBufferException(如果此缓冲区由数组支持，但为只读)

以下示例程序旨在说明array()方法：

范例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"); 
        } 
    } 
}

范例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); 
        } 
    } 
}

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注：本文由纯净天空筛选整理自pawan_asipu大神的英文原创作品 LongBuffer hasArray() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。