Java 中的 FloatBuffer get() 方法及示例

2025年1月7日 | 阅读 6 分钟

FloatBuffer get() 有两种主要方法。

get()
get(int index)

get()

java.nio.FloatBuffer 类具有 get() 函数。FloatBuffer 类用于读取缓冲区当前位置的浮点数并递增其值。

语法

返回值：此方法返回缓冲区当前位置的浮点值。

BufferUnderflowException：当缓冲区当前位置不小于其最大值时，会引发此异常。

示例 1

Java 代码展示了如何使用 FloatBuffer。将三个浮点值添加到容量为 5 的 FloatBuffer 中。使用 rewind() 函数将缓冲区的当前位置重置到开头。显示了初始缓冲区的 contents，然后使用 get() 方法读取并显示当前位置和下一个位置的浮点值。程序处理在这些活动期间可能抛出的任何 IllegalArgumentException。

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 FloatBuffer's capacity 
		int cap = 5; 
		// Creating and declaring the FloatBuffer 
		try { 
			// Allocating size capacity and 
			// constructing an object of floatbuffer 
			FloatBuffer floatbuf = FloatBuffer.allocate(cap); 
		    // transfer the value to the floatbuffer 
			floatbuf.put(8.56F); 
			floatbuf.put(9.61F); 
			floatbuf.put(1.24F); 
			floatbuf.rewind(); 
			// displaying the FloatBuffer 
			System.out.println("The Original FloatBuffer is given by: " + Arrays.toString(floatbuf.array())); 
			// Using the get() method, reads the float 
			// at the current location in this buffer. 
			float val = floatbuf.get(); 
			// displaying the Float value 
			System.out.println("\nThe Float Value is: " + val); 
			// Using the get() method, reads the float 
			// at the next location in this buffer. 
			float val1 = floatbuf.get(); 
			// displaying the Float value 
			System.out.print("\nThe Next Float Value is: " + val1); 
		} 
		catch (IllegalArgumentException ex) 
		{ 
			System.out.println("\nIllegalArgumentException is thrown"); 
		} 
	} 
}   

输出

 
The Original FloatBuffer is given by: [8.56, 9.61, 1.24, 0.0, 0.0]
The Float Value is: 8.56
The Next Float Value is: 9.61

示例 2

展示了使用 java.nio 包中的 FloatBuffer 的 Java 程序。首先，分配一个容量为三的 FloatBuffer。然后向缓冲区添加两个浮点值 7.26F 和 8.97F。通过调用 Arrays.toString(floatbuf.array()) 显示缓冲区 contents。使用 get() 方法，程序读取并输出当前和下一个位置的浮点值。如果缓冲区的位置超出限制，则缓冲区会捕获并打印 IllegalArgumentException。

实施

文件名：getFloatExample2.java

 
import java.io.*;
import java.nio.*; 
import java.util.*; 
public class getFloatExample2 
{ 
	public static void main(String[] args) 
	{ 
		// Declaring the capacity of the FloatBuffer 
		int cap = 3; 
		// Creating and declaring the FloatBuffer 
		try { 
			// Allocating size capacity and constructing 
			// an object of floatbuffer 
			FloatBuffer floatbuf = FloatBuffer.allocate(cap); 
			// transfer the value to the floatbuffer 
			floatbuf.put(7.26F); 
			floatbuf.put(8.97F); 
			// displaying the FloatBuffer 
			System.out.println("The Original FloatBuffer is given by: " + Arrays.toString(floatbuf.array())); 
			// Using the get() method, reads the float at 
			// the current location in this buffer. 
			float val = floatbuf.get(); 
			// displaying the Float value 
			System.out.println("\nThe Float Value is: " + val); 
			// Using the get() method, reads the float 
			// at the next location in this buffer. 
			System.out.print("\nSince the current position of the buffer is increased" + "to exceed its upper limit"); 
			float val1 = floatbuf.get(); 
			// displaying the Float value 
			System.out.print("\nThe Next Float Value is: " + val1); 
		} 
		catch (IllegalArgumentException ex) 
		{ 
			System.out.println("\nIllegalArgumentException catched"); 
		} 
	} 
}   

输出

 
The Original FloatBuffer is given by: [7.26, 8.97, 0.0]
The Float Value is: 0.0
Since the current position of the buffer is increased to exceed its upper limitException in thread "main" java.nio.BufferUnderflowException
	at java.base/java.nio.Buffer.nextGetIndex(Buffer.java:702)
	at java.base/java.nio.HeapFloatBuffer.get(HeapFloatBuffer.java:172)
	at getFloatExample2.main(getFloatExample2.java:28)

get(int index)

本文介绍了使用 FloatBuffer get(int index) 方法在指定索引处进行处理。

语法

参数：此方法有一个参数，即 index，它是将从中读取浮点数的索引。

返回值：此方法返回指定索引处的浮点值。

异常：此方法抛出 IndexOutOfBoundsException。如果索引为负数或不小于缓冲区的限制，则会引发此异常。

示例 1

提供的 Java 程序展示了如何使用 java.nio 包中的 FloatBuffer。首先，分配一个容量为三的 FloatBuffer，并将三个浮点值（7.26F、8.23F 和 9.14F）放入其中。使用 Arrays.toString(floatbuff.array()) 显示缓冲区 contents。然后，程序使用 get(int index) 函数检索并打印特定索引（0、1 和 2）处的浮点值。通过捕获并打印必要的错误消息，程序确保了稳健的错误处理，以防出现非法参数或索引越界异常。

实施

文件名：GetIndexFloatExample1.java

 
import java.io.*;
import java.nio.*; 
import java.util.*; 
public class GetIndexFloatExample1 
{ 
	public static void main(String[] args) 
	{ 
		// Declaring the FloatBuffer's capacity 
		int cap = 3; 
		// Creating and declaring the FloatBuffer 
		try { 
			// Allocating size capacity and constructing
			// an object of floatbuffer 
			FloatBuffer floatbuff = FloatBuffer.allocate(cap); 
			// transfer the value to the floatbuffer 
			floatbuff.put(7.26F); 
			floatbuff.put(8.23F); 
			floatbuff.put(9.14F); 
			// displaying the FloatBuffer 
			System.out.println("The Original FloatBuffer is given by: " + Arrays.toString(floatbuff.array())); 
			// Utilizing the get() function, reads the 
			// float located at index 0 of the floatbuffer. 
			float val = floatbuff.get(0); 
			// displaying the Float value 
			System.out.println("\nThe Float Value at index 0 is: " + val); 
			// Utilizing the get() function, reads the 
			// float located at index 1 of the floatbuffer. 
			float val1 = floatbuff.get(1); 
			// displaying the Float value 
			System.out.println("\nThe Float Value at index 1 is: " + val1); 
			// Utilizing the get() function, reads the 
			// float located at index 2 of the floatbuffer. 
			float val2 = floatbuff.get(2); 
			// displaying the Float value 
			System.out.println("\nThe Float Value at index 2 is: " + val2); 
		} 
		catch (IllegalArgumentException ex) { 
			System.out.println("\nIllegalArgumentException is catched"); 
		} 

		catch (IndexOutOfBoundsException ex) { 
			System.out.println("\nReadOnlyBufferException is catched"); 
		} 
	} 
}   

输出

 
The Original FloatBuffer is given by: [7.26, 8.23, 9.14]
The Float Value at index 0 is: 7.26
The Float Value at index 1 is: 8.23
The Float Value at index 2 is: 9.14

示例 2

此 Java 程序展示了如何使用 java.nio 包中的 FloatBuffer 操作。它添加了三个浮点值（7.26F、8.23F 和 9.14F），并分配了一个容量为 3 的 FloatBuffer。使用 Arrays.toString(floatbuff.array()) 显示缓冲区 contents。应用程序使用 get(int index) 方法检索并打印指定索引处的浮点数据。尝试访问越界索引（索引 7）时会引发异常。程序会打印每种问题的相关错误消息，包括 IllegalArgumentException、IndexOutOfBoundsException 和 BufferUnderflowException。

实施

文件名：GetIndexFloatExample2.java

 
import java.io.*;
import java.nio.*; 
import java.util.*; 
public class GetIndexFloatExample2
{ 
	public static void main(String[] args) 
	{ 
		// Declaring the FloatBuffer's capacity 
		int cap = 3; 
		// Creating and declaring the FloatBuffer 
		try { 
			// Allocating size capacity and constructing
			// an object of floatbuffer 
			FloatBuffer floatbuff = FloatBuffer.allocate(cap); 
			// transfer the value to the floatbuffer 
			floatbuff.put(7.26F); 
			floatbuff.put(8.23F); 
			floatbuff.put(9.14F); 
			// displaying the FloatBuffer 
			System.out.println("The Original FloatBuffer is given by: " + Arrays.toString(floatbuff.array())); 
			// Utilizing the get() function, reads the 
			// float located at index 0 of the floatbuffer. 
			float val = floatbuff.get(0); 
			// displaying the Float value 
			System.out.println("\nThe Float Value at index 0 is: " + val); 
			// Utilizing the get() function, reads the 
			// float located at index 1 of the floatbuffer. 
			float val1 = floatbuff.get(1); 
			// displaying the Float value 
			System.out.println("\nThe Float Value at index 1 is: " + val1); 
			// Utilizing the get() function, reads the 
			// float located at index 2 of the floatbuffer. 
			float val2 = floatbuff.get(7); 
			// displaying the Float value 
			System.out.println("\nThe Float Value at index 2 is: " + val2); 
		} 
		catch (IllegalArgumentException ex) { 
			System.out.println("\nIllegalArgumentException is catched"); 
		} 

		catch (IndexOutOfBoundsException ex) { 
			System.out.println("\nReadOnlyBufferException is catched"); 
		} 
		catch (BufferUnderflowException ex) { 
			System.out.println("The Exception thrown is : " + ex); 
		} 
	} 
}   

输出

 
The Original FloatBuffer is given by: [7.26, 8.23, 9.14]
The Float Value at index 0 is: 7.26
The Float Value at index 1 is: 8.23
ReadOnlyBufferException is catched

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Java 中的 FloatBuffer get() 方法及示例

get()

示例 1

实施

示例 2

实施

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示例 1

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Java 中的 FloatBuffer get() 方法及示例

get()

示例 1

实施

示例 2

实施

get(int index)

示例 1

实施

示例 2

实施

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