DoubleBuffer get() methods in Java with Examples

2025年3月27日 | 阅读 3 分钟

java.nio.DoubleBuffer 提供了 get() 函数。DoubleBuffer 类用于读取缓冲区当前位置的 double 值，然后递增该位置。

语法

返回值：此方法返回缓冲区当前位置的 double 值。

异常：此方法抛出 BufferUnderflowException 或 BufferOverflowException。如果缓冲区的当前位置小于其限制或反之，则会引发此异常。

示例 1

DoubleBuffer 类用于存储和检索双精度浮点数，如提供的 Java 程序所示。在分配了容量为 5 的缓冲区后，将三个 double 值插入缓冲区。使用 rewind() 函数从缓冲区开头读取插入的值。然后，应用程序使用 get() 方法从缓冲区中检索并打印前两个值。此外，它还涵盖了对 BufferUnderflowException、ReadOnlyBufferException 和 IllegalArgumentException 等潜在异常的错误处理。

实施

文件名：BufferGetExample1.java

import java.io.*;
import java.nio.*; 
import java.util.*; 
public class BufferGetExample1 
{ 
	public static void main(String[] args) 
	{ 
		// Declaring the capacity of the FloatBuffer 
		int cap = 5; 
		// Declaring and Creating the FloatBuffer 
		try { 
			// Allocating size capacity and constructing 
			// an object of floatbuffer 
			DoubleBuffer floatbuff = DoubleBuffer.allocate(cap); 
		    // adding the value to the Doublebuffer 
			floatbuff.put(8.36D); 
			floatbuff.put(10.36D); 
			floatbuff.put(9.14D); 
			floatbuff.rewind(); 
			// displaying the DoubleBuffer 
			System.out.println("The Original DoubleBuffer is given by : " + Arrays.toString(floatbuff.array())); 
			// Using the get() method, reads the double at 
			// the present place in this buffer. 
			double val = floatbuff.get(); 
			// displaying the double value 
			System.out.println("\nThe Double Value is : " + val); 
			// Using the get() method, reads the double at 
			// the next location in this buffer. 
			double val1 = floatbuff.get(); 
			// displaying the double value 
			System.out.print("\nThe Next double Value is given by : " + val1); 
		} 
		catch (IllegalArgumentException ex) { 
			System.out.println("\nIllegalArgumentException is catched"); 
		} 
		catch (ReadOnlyBufferException ex) { 
			System.out.println("\nReadOnlyBufferException is catched"); 
		} 
		catch (BufferUnderflowException ex) { 
			System.out.println("\nThe Exception thrown is: " + ex); 
		} 
	} 
}   

输出

 
The Original DoubleBuffer is given by : [8.36, 10.36, 9.14, 0.0, 0.0]
The Double Value is : 8.36
The Next double Value is given by : 10.36

示例 2

该 Java 程序演示了如何使用 DoubleBuffer 存储和处理 double 值。在创建了容量为 2 的 DoubleBuffer 后，尝试添加三个 double 值。当添加第三个值时，缓冲区的容量超出，导致代码产生 BufferOverflowException。该程序使用 Arrays.toString() 函数显示缓冲区的内容，并使用 get() 方法从缓冲区获取并输出两个值。此外，它还处理了 BufferUnderflowException、ReadOnlyBufferException 和 IllegalArgumentException 等潜在故障的异常。

实施

文件名：BufferGetExample2.java

import java.io.*;
import java.nio.*; 
import java.util.*; 
public class BufferGetExample2
{ 
	public static void main(String[] args) 
	{ 
		// Declaring the capacity of the FloatBuffer 
		int cap = 2; 
		// Declaring and Creating the FloatBuffer 
		try { 
			// Allocating size capacity and constructing 
			// an object of floatbuffer 
			DoubleBuffer floatbuff = DoubleBuffer.allocate(cap); 
		    // adding the value to the Doublebuffer 
			floatbuff.put(8.36D); 
			floatbuff.put(10.36D); 
			floatbuff.put(9.14D); 
			floatbuff.rewind(); 
			// displaying the DoubleBuffer 
			System.out.println("The Original DoubleBuffer is given by : " + Arrays.toString(floatbuff.array())); 
			// Using the get() method, reads the double at 
			// the present place in this buffer. 
			double val = floatbuff.get(); 
			// displaying the double value 
			System.out.println("\nThe Double Value is : " + val); 
			// Using the get() method, reads the double at 
			// the next location in this buffer. 
			double val1 = floatbuff.get(); 
			// displaying the double value 
			System.out.print("\nThe Next double Value is given by : " + val1); 
		} 
		catch (IllegalArgumentException ex) { 
			System.out.println("\nIllegalArgumentException is catched"); 
		} 
		catch (ReadOnlyBufferException ex) { 
			System.out.println("\nReadOnlyBufferException is catched"); 
		} 
		catch (BufferUnderflowException ex) { 
			System.out.println("\nThe Exception thrown is: " + ex); 
		} 
	} 
}   

输出

 
Exception in thread "main" java.nio.BufferOverflowException
at java.base/java.nio.Buffer.nextPutIndex(Buffer.java:725)
at java.base/java.nio.HeapDoubleBuffer.put(HeapDoubleBuffer.java:216)
at BufferGetExample1.main(BufferGetExample1.java:18)

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