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Java DoubleBuffer put()方法用法及代码示例


put(double f)

java.nio.DoubleBuffer类的put(double f)方法用于将给定的double写入当前位置的新创建的double缓冲区中，然后递增该位置。

用法:

public abstract DoubleBuffer put(double f)

参数：该方法将双精度值f作为要写入双精度缓冲区的参数。



返回值：此方法返回此缓冲区，在该缓冲区中插入了double值。

异常：此方法引发以下异常：

  • BufferOverflowException-如果此缓冲区的当前位置不小于其限制
  • ReadOnlyBufferException-如果此缓冲区是只读的

以下示例说明了put(double f)方法：

范例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]

范例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

范例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(int index, double f)

java.nio.DoubleBuffer类的put(int index，double f)方法用于将给定double写入给定索引处的缓冲区。

用法:



public abstract DoubleBuffer put(int index, double f)

参数：此方法将以下参数作为参数：

  • index：将写入双精度的索引
  • f：要写入的双精度值

返回值：此方法返回此缓冲区。

异常：此方法引发以下异常：

  • IndexOutOfBoundsException-如果索引为负或不小于缓冲区的限制
  • ReadOnlyBufferException-如果此缓冲区是只读的

以下示例说明了put(int index，double f)方法：

范例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]

范例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 index
Exception throws:java.lang.IndexOutOfBoundsException

范例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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注：本文由纯净天空筛选整理自pawan_asipu大神的英文原创作品 DoubleBuffer put() methods in Java with Examples | Set 1。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。