Java中的ByteBuffer asFloatBuffer（）方法及其示例-yiteyi-C++库

这个 asFloatBuffer（） 方法 JAVA尼奥。ByteBuffer 类用于创建此字节缓冲区作为浮点缓冲区的视图。新缓冲区的内容将从此缓冲区的当前位置开始。对该缓冲区内容所做的更改将在新缓冲区中可见，反之亦然；两个缓冲器的位置、极限和标记值将是独立的。新缓冲区的位置将为零，其容量和限制将为该缓冲区中剩余的字节数除以四，其标记将未定义。当且仅当此缓冲区是直接缓冲区时，新缓冲区将是直接缓冲区；当且仅当此缓冲区是只读缓冲区时，新缓冲区将是只读缓冲区。

null

语法：

public abstract FloatBuffer asFloatBuffer()

返回值： 此方法返回一个新的浮点缓冲区

下面是asFloatBuffer（）方法的示例：

例1：

JAVA

                         // Java program to demonstrate                       
                         // asFloatBuffer() method                       
                         // for ByteBuffer                       
           
                         import                                     java.nio.*;                       
                         import                                     java.util.*;                       
           
                         public                                     class                                     GFG {                       
           
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
           
                                                 // Declaring the capacity  of the ByteBuffer                       
                                                 int                                     capacity =                                     50                                     ;                       
           
                                                 // Creating the ByteBuffer                       
                                                 try                                     {                       
           
                                                 // creating object of  ByteBuffer                       
                                                 // and allocating size capacity                       
                                                 ByteBuffer bb = ByteBuffer.allocate(capacity);                       
           
                                                 // changing  bytebuffer into                       
                                                 // FloatBuffer                       
                                                 FloatBuffer cb = bb.asFloatBuffer();                       
           
                                                 // putting the value in FloatBuffer                       
                                                 cb.put(                                     1                                     .23F);                       
                                                 cb.put(                                     1                                     .33F);                       
                                                 cb.put(                                     1                                     .56F);                       
                                                 cb.rewind();                       
           
                                                 // Declaring variable c                       
                                                 Float c;                       
           
                                                 // print the ByteBuffer                       
                                                 System.out.print(                                     "FloatBuffer : "                                     );                       
                                                 while                                     ((c = cb.get()) !=                                     0                                     )                       
                                                 System.out.print(c +                                     " "                                     );                       
                                                 }                       
           
                                                 catch                                     (IllegalArgumentException e) {                       
           
                                                 System.out.println(                                     "Exception thrown : "                                     + e);                       
                                                 }                       
           
                                                 catch                                     (ReadOnlyBufferException e) {                       
           
                                                 System.out.println(                                     "Exception thrown : "                                     + e);                       
                                                 }                       
                                                 }                       
                         }                       

输出：

FloatBuffer : 1.23 1.33 1.56

例2：

JAVA

                         // Java program to demonstrate                       
                         // asFloatBuffer() method                       
                         // for Read only ByteBuffer                       
           
                         import                                     java.nio.*;                       
                         import                                     java.util.*;                       
           
                         public                                     class                                     GFG {                       
           
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
           
                                                 // Declaring the capacity  of the ByteBuffer                       
                                                 int                                     capacity =                                     50                                     ;                       
           
                                                 // Creating the ByteBuffer                       
                                                 try                                     {                       
           
                                                 // creating object of  ByteBuffer                       
                                                 // and allocating size capacity                       
                                                 ByteBuffer bb = ByteBuffer.allocate(capacity);                       
           
                                                 // changing  bytebuffer into                       
                                                 // FloatBuffer                       
                                                 FloatBuffer cb = bb.asFloatBuffer();                       
           
                                                 // putting the value in FloatBuffer                       
                                                 cb.put(                                     2                                     .1F);                       
                                                 cb.put(                                     3                                     .1F);                       
                                                 cb.put(                                     4                                     .1F);                       
                                                 cb.rewind();                       
           
                                                 // Declaring variable c                       
                                                 Float c;                       
           
                                                 // print the ByteBuffer                       
                                                 System.out.print(                                     "FloatBuffer : "                                     );                       
                                                 while                                     ((c = cb.get()) !=                                     0                                     )                       
                                                 System.out.print(c +                                     "  "                                     );                       
           
                                                 // Creating a read-only copy of ByteBuffer                       
                                                 // using asReadOnlyBuffer() method                       
                                                 ByteBuffer bb1 = bb.asReadOnlyBuffer();                       
           
                                                 // changing read-only bytebuffer into                       
                                                 // read-only FloatBuffer                       
                                                 FloatBuffer cb1 = bb1.asFloatBuffer();                       
           
                                                 // putting the value in read-only FloatBuffer                       
                                                 System.out.println(                                     "Trying to put the value "                       
                                                 +                                     "in read only FloatBuffer"                                     );                       
                                                 cb1.put(                                     2                                     .1F);                       
                                                 cb1.put(                                     3                                     .1F);                       
                                                 cb1.put(                                     4                                     .1F);                       
                                                 cb1.rewind();                       
                                                 }                       
           
                                                 catch                                     (IllegalArgumentException e) {                       
           
                                                 System.out.println(                                     "Exception thrown : "                                     + e);                       
                                                 }                       
           
                                                 catch                                     (ReadOnlyBufferException e) {                       
           
                                                 System.out.println(                                     "Exception thrown : "                                     + e);                       
                                                 }                       
                                                 }                       
                         }                       

输出：

FloatBuffer : 2.1  3.1  4.1  Trying to put the value in read only FloatBufferException thrown : java.nio.ReadOnlyBufferException

文章版权归作者所有，未经允许请勿转载。

THE END

Java