java.nio.FloatBuffer类的array()方法用于返回支持此缓冲区的float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 float[] 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 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();
// getting array from fb FloatBuffer using array() method
float[] fbb = fb.array();
// printing the FloatBuffer fb
System.out.println("FloatBuffer: "
+ Arrays.toString(fbb));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
输出:
FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
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 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(9.56F);
fb.put(2, 7.61F);
fb.put(3, 4.61F);
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);
}
}
}
输出:
FloatBuffer fb: [9.56, 0.0, 7.61, 4.61, 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: 9.56, 0.0, 7.61, 4.61, 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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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 FloatBuffer array() method in Java With Examples。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。