Java IntBuffer array()方法

java.nio.IntBuffer 类的 array() 方法是用来返回支持这个缓冲区的int数组。对这个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。在调用此方法之前，先使用Invoke()和hasArray()方法，以确保此缓冲区有一个可访问的支持数组。

语法

public final int[] array()

返回值： 该方法返回支持该缓冲区的数组。

异常： 该方法抛出 ReadOnlyBufferException （如果这个缓冲区是由一个数组支持的，但是是只读的）。

下面的程序说明了 array() 方法。

例子 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 IntBuffer        int capacity = 10;          // Creating the IntBuffer        try {              // creating object of Intbuffer            // and allocating size capacity            IntBuffer ib = IntBuffer.allocate(capacity);              // putting the value in Intbuffer            ib.put(7);            ib.put(2, 6);            ib.rewind();              // getting array from ib IntBuffer using array() method            int[] ibb = ib.array();              // printing the IntBuffer ib            System.out.println("IntBuffer:  "                               + Arrays.toString(ibb));        }          catch (IllegalArgumentException e) {              System.out.println("IllegalArgumentException catched");        }          catch (ReadOnlyBufferException e) {              System.out.println("ReadOnlyBufferException catched");        }    }}

输出:

IntBuffer:  [7, 0, 6, 0, 0, 0, 0, 0, 0, 0]

例子 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 IntBuffer        try {            //            // ib            //            // creating object of Intbuffer ib            // and allocating size capacity            IntBuffer ib = IntBuffer.allocate(capacity1);              // putting the value in ib            ib.put(7);            ib.put(2, 6);            ib.put(3, 7);            ib.rewind();              // print the IntBuffer            System.out.println("IntBuffer ib: "                               + Arrays.toString(ib.array()));              //            // ib1            //            // creating object of Intbuffer ib1            // and allocating size capacity            IntBuffer ib1 = IntBuffer.allocate(capacity2);              // putting the value in ib1            ib1.put(1, 4);            ib1.put(2, 6);            ib1.rewind();              // print the IntBuffer            System.out.println("\nIntBuffer ib1:  "                               + Arrays.toString(ib1.array()));              // Creating a read-only copy of IntBuffer            // using asReadOnlyBuffer() method            IntBuffer readOnlyib = ib.asReadOnlyBuffer();              // print the IntBuffer            System.out.print("\nReadOnlyBuffer IntBuffer: ");              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");              int[] ibarr = readOnlyib.array();        }        catch (IllegalArgumentException e) {            System.out.println("IllegalArgumentException catched");        }        catch (ReadOnlyBufferException e) {            System.out.println("Exception thrown: " + e);        }    }}

输出:

IntBuffer ib: [7, 0, 6, 7, 0, 0, 0, 0, 0, 0]IntBuffer ib1:  [0, 4, 6, 0, 0]ReadOnlyBuffer IntBuffer: 7, 0, 6, 7, 0, 0, 0, 0, 0, 0, Trying to get the array from ReadOnlyib for editingException thrown: java.nio.ReadOnlyBufferException