推杆（双f）
这个 推杆（双f） 方法 JAVA尼奥。双缓冲区 类用于在当前位置将给定的双精度写入新创建的双精度缓冲区，然后递增该位置。
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语法：
public abstract DoubleBuffer put(double f)
参数： 此方法采用双倍值 F 作为要写入双缓冲区的参数。
返回值： 此方法返回 这个缓冲区 ，其中插入了双精度值。
例外情况： 此方法引发以下异常：
- BufferOverflowException –如果该缓冲器的当前位置不小于其极限
- ReadOnlyBufferException –如果该缓冲区是只读的
以下是说明put（双f）方法的示例： 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： 演示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 limit Exception throws : java.nio.BufferOverflowException
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 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 buffer Exception throws : java.nio.ReadOnlyBufferException
put（整数索引，双f）
这个 put（整数索引，双f） 方法 JAVA尼奥。双缓冲区 类用于将给定的double写入给定索引处的缓冲区。
语法：
public abstract DoubleBuffer put(int index, double f)
参数： 此方法将以下参数作为参数：
- 指数 ：将写入双精度的索引
- F ：要写入的双值
返回值： 此方法返回 这是缓冲区。
异常：此方法引发以下异常：
- IndexOutOfBoundsException –如果指数为负值或不小于缓冲区的限制
- ReadOnlyBufferException –如果该缓冲区是只读的
下面是说明put（整数索引，双f）方法的示例：
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： 展示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 index Exception 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 buffer Exception throws : java.nio.ReadOnlyBufferException
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