Java FloatBuffer put()方法及例子

put(float f)

java.nio.FloatBuffer 类的 put(float f) 方法用于将给定的浮点数写入新创建的浮点数缓冲区的当前位置，然后递增该位置。

语法:

public abstract FloatBuffer put(float f)

参数： 该方法以Float值f作为参数，将其写入Float缓冲区。

返回值： 该方法返回这个缓冲区，在这个缓冲区中插入了浮点值。

异常： 该方法会抛出以下异常。

下面是说明put(float f)方法的例子。

例1 :

// Java program to demonstrate// put() method  import java.nio.*;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // Declaring the capacity of the FloatBuffer        int capacity = 3;          // Creating the FloatBuffer        try {              // creating object of floatbuffer            // and allocating size capacity            FloatBuffer fb = FloatBuffer.allocate(capacity);              // putting the value in floatbuffer using put() method            fb.put(8.56F);            fb.put(9.61F);            fb.put(7.86F);            fb.rewind();              // print the FloatBuffer            System.out.println("Original FloatBuffer:  "                               + Arrays.toString(fb.array()));        }          catch (BufferOverflowException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出。

Original FloatBuffer:  [8.56, 9.61, 7.86]

例2： 为了证明BufferOverflowException。

// Java program to demonstrate// put() method  import java.nio.*;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // Declaring the capacity of the FloatBuffer        int capacity = 3;          // Creating the FloatBuffer        try {              // creating object of floatbuffer            // and allocating size capacity            FloatBuffer fb = FloatBuffer.allocate(capacity);              // putting the value in floatbuffer using put() method            fb.put(8.56F);            fb.put(9.61F);            fb.put(7.86F);              System.out.println("Trying to put the float at the "                             + "position more than its limit");            fb.put(7.86F);              // rewind the floatbuffer            fb.rewind();              // print the FloatBuffer            System.out.println("Original FloatBuffer:  "                               + Arrays.toString(fb.array()));        }          catch (BufferOverflowException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出。

Trying to put the float at the position more than its limitException throws : java.nio.BufferOverflowException

实例3： 为了证明ReadOnlyBufferException。

// Java program to demonstrate// put() method  import java.nio.*;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // Declaring the capacity of the FloatBuffer        int capacity = 3;          // Creating the FloatBuffer        try {              // creating object of floatbuffer            // and allocating size capacity using allocate() method            FloatBuffer fb = FloatBuffer.allocate(capacity);              // Creating a read-only copy of FloatBuffer            // using asReadOnlyBuffer() method            FloatBuffer fb1 = fb.asReadOnlyBuffer();              System.out.println("Trying to put the float value"                               + " in read only buffer");              // putting the value in readonly floatbuffer            // using put() method            fb1.put(8.56F);        }          catch (BufferOverflowException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出。

Trying to put the float value in read only bufferException throws : java.nio.ReadOnlyBufferException

put(int index, float f)

java.nio.FloatBuffer类的put(int index, float f)方法是用来将给定的浮点数写入给定索引的缓冲区中。

语法

public abstract FloatBuffer put(int index, float f)

参数： 该方法需要以下参数作为参数。

返回值 ：该方法返回这个缓冲区。

异常： 该方法会抛出以下异常。

下面是一些例子来说明put(int index, float f)方法。

例1 :

// Java program to demonstrate// put() method  import java.nio.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the capacity of the FloatBuffer        int capacity = 3;          // Creating the FloatBuffer        try {              // creating object of floatbuffer            // and allocating size capacity            FloatBuffer fb = FloatBuffer.allocate(capacity);              // putting the value in floatbuffer using put() at  index 0            fb.put(0, 8.56F);              // putting the value in floatbuffer using put() at  index 2            fb.put(2, 9.61F);              // putting the value in floatbuffer using put() at  index 1            fb.put(1, 7.86F);              // rewinding the floatbuffer            fb.rewind();              // print the FloatBuffer            System.out.println("Original FloatBuffer:  "                               + Arrays.toString(fb.array()));        }          catch (IndexOutOfBoundsException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出。

Original FloatBuffer:  [8.56, 7.86, 9.61]

例2： 演示IndexOutOfBoundsException。

// Java program to demonstrate// put() method  import java.nio.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the capacity of the FloatBuffer        int capacity = 3;          // Creating the FloatBuffer        try {              // creating object of floatbuffer            // and allocating size capacity            FloatBuffer fb = FloatBuffer.allocate(capacity);              // putting the value in floatbuffer            // using put() at  index 0            fb.put(0, 8.56F);              // putting the value in floatbuffer            // using put() at  index 2            fb.put(2, 9.61F);              // putting the value in floatbuffer            // using put() at  index -1            System.out.println("Trying to put the value"                               + " at the negative index");            fb.put(-1, 7.86F);        }          catch (IndexOutOfBoundsException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出。

Trying to put the value at the negative indexException throws : java.lang.IndexOutOfBoundsException

例3： 演示ReadOnlyBufferException。

// Java program to demonstrate// put() method  import java.nio.*;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // Declaring the capacity of the FloatBuffer        int capacity = 3;          // Creating the FloatBuffer        try {              // creating object of floatbuffer            // and allocating size capacity using allocate() method            FloatBuffer fb = FloatBuffer.allocate(capacity);              // Creating a read-only copy of FloatBuffer            // using asReadOnlyBuffer() method            FloatBuffer fb1 = fb.asReadOnlyBuffer();              System.out.println("Trying to put the float value"                               + " in read only buffer");              // putting the value in readonly floatbuffer            // using put() method            fb1.put(0, 8.56F);        }          catch (BufferOverflowException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出。

Trying to put the float value in read only bufferException throws : java.nio.ReadOnlyBufferException