Java 中的 LongBuffer asReadOnlyBuffer()方法
原文:https://www . geesforgeks . org/longbuffer-as readonly buffer-in-method-in-Java/
使用 java.nio.LongBuffer 类的 asReadOnlyBuffer() 方法，用该缓冲区的内容创建一个新的只读长缓冲区。新缓冲区是该缓冲区的副本。因此，对此缓冲区内容所做的更改将在新缓冲区中可见。
由于新缓冲区是只读的，因此不允许对其内容进行任何修改。两个缓冲器的位置、极限和标记值将是独立的。新缓冲区的容量、限制、位置和标记值将与该缓冲区相同。如果此缓冲区本身是只读的，则此方法的行为方式与复制方法完全相同。
语法:
public abstract LongBuffer asReadOnlyBuffer()
返回值:该方法返回新的只读长缓冲区，其内容与该缓冲区相同。
下面是说明 asReadOnlyBuffer()方法的示例:
实施例 1:
// Java program to demonstrate
// asReadOnlyBuffer() 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(8);
ib.put(2, 9);
ib.rewind();
// prLong the LongBuffer
System.out.println("Original LongBuffer: "
+ Arrays.toString(ib.array()));
// Creating a read-only copy of LongBuffer
// using asReadOnlyBuffer() method
LongBuffer LongBuffer = ib.asReadOnlyBuffer();
// prLong the LongBuffer
System.out.print("\nReadOnlyBuffer LongBuffer: ");
while (LongBuffer.hasRemaining())
System.out.print(LongBuffer.get() + ", ");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original LongBuffer: [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]
ReadOnlyBuffer LongBuffer: 8, 0, 9, 0, 0, 0, 0, 0, 0, 0,
实施例 2:
// Java program to demonstrate
// asReadOnlyBuffer() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args) throws Exception
{
// Declaring the capacity of the ib
int capacity1 = 10;
// Declaring the capacity of the ib1
int capacity2 = 5;
// Creating the LongBuffer
try {
// creating object of Longbuffer ib
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity1);
// putting the value in ib
ib.put(8);
ib.put(2, 9);
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");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
LongBuffer ib: [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]
LongBuffer ib1: [0, 4, 6, 0, 0]
ReadOnlyBuffer LongBuffer: 8, 0, 9, 0, 0, 0, 0, 0, 0, 0,
Trying to get the array from ReadOnlyib for editing
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