Java 中的 FloatBuffer asReadOnlyBuffer()方法，示例
原文:https://www . geesforgeks . org/float buffer-as readonly buffer-method-in-Java-with-examples/
java.nio.FloatBuffer 类的 asReadOnlyBuffer() 方法用于用该缓冲区的内容创建一个新的只读浮动缓冲区。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 FloatBuffer asReadOnlyBuffer()
返回值:该方法返回新的只读浮动缓冲区，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 FloatBuffer
int capacity = 10;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer
fb.put(8.56F);
fb.put(2, 9.61F);
fb.rewind();
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb.array()));
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer floatBuffer = fb.asReadOnlyBuffer();
// print the FloatBuffer
System.out.print("\nReadOnlyBuffer FloatBuffer: ");
while (floatBuffer.hasRemaining())
System.out.print(floatBuffer.get() + ", ");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
ReadOnlyBuffer FloatBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 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 fb
int capacity1 = 10;
// Declaring the capacity of the fb1
int capacity2 = 5;
// Creating the FloatBuffer
try {
//
// fb
//
// creating object of floatbuffer fb
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity1);
// putting the value in fb
fb.put(8.56F);
fb.put(2, 9.61F);
fb.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb: "
+ Arrays.toString(fb.array()));
//
// fb1
//
// creating object of floatbuffer fb1
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity2);
// putting the value in fb1
fb1.put(1, 4.56F);
fb1.put(2, 6.45F);
fb1.rewind();
// print the FloatBuffer
System.out.println("\nFloatBuffer fb1: "
+ Arrays.toString(fb1.array()));
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer readOnlyFb = fb.asReadOnlyBuffer();
// print the FloatBuffer
System.out.print("\nReadOnlyBuffer FloatBuffer: ");
while (readOnlyFb.hasRemaining())
System.out.print(readOnlyFb.get() + ", ");
// try to change readOnlyFb
System.out.println("\n\nTrying to get the array"
+ " from ReadOnlyFb for editing");
float[] fbarr = readOnlyFb.array();
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
FloatBuffer fb: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
FloatBuffer fb1: [0.0, 4.56, 6.45, 0.0, 0.0]
ReadOnlyBuffer FloatBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Trying to get the array from ReadOnlyFb for editing
Exception thrown: java.nio.ReadOnlyBufferException
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