Java DoubleBuffer put()方法及实例

put(double f)

java.nio.DoubleBuffer 类的 put(double f) 方法用于将给定的双倍数写入新创建的双倍数缓冲区的当前位置，然后递增该位置。

语法

public abstract DoubleBuffer put(double f)

参数： 该方法以双倍值 f 为参数，该值将被写入双倍缓冲区中。

返回值： 该方法返回 这个缓冲区 ，其中插入了双倍值。

异常： 该方法会抛出以下异常。

下面是说明put(double 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 DoubleBuffer        int capacity = 3;          // Creating the DoubleBuffer        try {              // creating object of Doublebuffer            // and allocating size capacity            DoubleBuffer db = DoubleBuffer.allocate(capacity);              // putting the value in Doublebuffer using put() method            db.put(8.56D);            db.put(9.61D);            db.put(7.86D);            db.rewind();              // print the DoubleBuffer            System.out.println("Original DoubleBuffer:  "                               + Arrays.toString(db.array()));        }          catch (BufferOverflowException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出:

Original DoubleBuffer:  [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 DoubleBuffer        int capacity = 3;          // Creating the DoubleBuffer        try {              // creating object of Doublebuffer            // and allocating size capacity            DoubleBuffer db = DoubleBuffer.allocate(capacity);              // putting the value in Doublebuffer using put() method            db.put(8.56F);            db.put(9.61F);            db.put(7.86F);              System.out.println("Trying to put the Double at the "                               + "position more than its limit");            db.put(7.86F);              // rewind the Doublebuffer            db.rewind();              // print the DoubleBuffer            System.out.println("Original DoubleBuffer:  "                               + Arrays.toString(db.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 Double 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 theDoubleBuffer        int capacity = 3;          // Creating theDoubleBuffer        try {              // creating object ofDoublebuffer            // and allocating size capacity using allocate() method            DoubleBuffer db = DoubleBuffer.allocate(capacity);              // Creating a read-only copy ofDoubleBuffer            // using asReadOnlyBuffer() method            DoubleBuffer db1 = db.asReadOnlyBuffer();              System.out.println("Trying to put theDouble value"                               + " in read only buffer");              // putting the value in readonlyDoublebuffer            // using put() method            db1.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 theDouble value in read only bufferException throws : java.nio.ReadOnlyBufferException

put(int index, double f)

java.nio.DoubleBuffer 类的 put(int index, double f) 方法是用来将给定的双倍数写入给定索引的缓冲区中。

语法

public abstract DoubleBuffer put(int index, double f)

参数： 该方法接受以下参数作为参数。

返回值 ：该方法返回 该缓冲区 。

异常情况。这个方法会抛出以下异常。

下面是说明put(int index, double 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 DoubleBuffer        int capacity = 3;          // Creating the DoubleBuffer        try {              // creating object of Doublebuffer            // and allocating size capacity            DoubleBuffer db = DoubleBuffer.allocate(capacity);              // putting the value in Doublebuffer using put() at  index 0            db.put(0, 8.56F);              // putting the value in Doublebuffer using put() at  index 2            db.put(2, 9.61F);              // putting the value in Doublebuffer using put() at  index 1            db.put(1, 7.86F);              // rewinding the Doublebuffer            db.rewind();              // print the DoubleBuffer            System.out.println("Original DoubleBuffer:  "                               + Arrays.toString(db.array()));        }          catch (IndexOutOfBoundsException e) {              System.out.println("Exception throws : " + e);        }          catch (ReadOnlyBufferException e) {              System.out.println("Exception throws : " + e);        }    }}

输出:

Original DoubleBuffer:  [8.5600004196167, 7.860000133514404, 9.609999656677246]

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 DoubleBuffer        int capacity = 3;          // Creating the DoubleBuffer        try {              // creating object of Doublebuffer            // and allocating size capacity            DoubleBuffer db = DoubleBuffer.allocate(capacity);              // putting the value in Doublebuffer            // using put() at  index 0            db.put(0, 8.56F);              // putting the value in Doublebuffer            // using put() at  index 2            db.put(2, 9.61F);              // putting the value in Doublebuffer            // using put() at  index -1            System.out.println("Trying to put the value"                               + " at the negative index");            db.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 DoubleBuffer        int capacity = 3;          // Creating the DoubleBuffer        try {              // creating object of Doublebuffer            // and allocating size capacity using allocate() method            DoubleBuffer db = DoubleBuffer.allocate(capacity);              // Creating a read-only copy of DoubleBuffer            // using asReadOnlyBuffer() method            DoubleBuffer db1 = db.asReadOnlyBuffer();              System.out.println("Trying to put the Double value"                               + " in read only buffer");              // putting the value in readonly Doublebuffer            // using put() method            db1.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 Double value in read only bufferException throws : java.nio.ReadOnlyBufferException