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📜  Java中的 FloatBuffer get() 方法及示例

📅  最后修改于: 2022-05-13 01:54:26.470000             🧑  作者: Mango

Java中的 FloatBuffer get() 方法及示例

得到()

Java.nio.FloatBuffer类的get()方法用于读取给定缓冲区当前位置的浮点数,然后递增该位置。

句法 :

public abstract float get()

返回值:此方法返回缓冲区当前位置的浮点值。

抛出:此方法抛出BufferUnderflowException – 如果缓冲区的当前位置不小于其限制,则抛出此异常。

以下是说明 get() 方法的示例:

示例 1:

// Java program to demonstrate
// get() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the FloatBuffer
        int capacity = 5;
  
        // Creating the FloatBuffer
        try {
  
            // creating object of floatbuffer
            // and allocating size capacity
            FloatBuffer fb = FloatBuffer.allocate(capacity);
  
            // putting the value in floatbuffer
            fb.put(8.56F);
            fb.put(9.61F);
            fb.put(1.24F);
            fb.rewind();
  
            // print the FloatBuffer
            System.out.println("Original FloatBuffer:  "
                               + Arrays.toString(fb.array()));
  
            // Reads the float at this buffer's current position
            // using get() method
            float value = fb.get();
  
            // print the Float value
            System.out.println("\nFloat Value: " + value);
  
            // Reads the  float at this buffer's next position
            // using get() method
            float value1 = fb.get();
  
            // print the Float value
            System.out.print("\nNext Float Value: " + value1);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("\nIllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("\nReadOnlyBufferException catched");
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("\nException throws: " + e);
        }
    }
}
输出:
Original FloatBuffer:  [8.56, 9.61, 1.24, 0.0, 0.0]

Float Value: 8.56

Next Float Value: 9.61

示例 2:

// Java program to demonstrate
// get() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the FloatBuffer
        int capacity = 3;
  
        // Creating the FloatBuffer
        try {
  
            // creating object of floatbuffer
            // and allocating size capacity
            FloatBuffer fb = FloatBuffer.allocate(capacity);
  
            // putting the value in floatbuffer
            fb.put(8.56F);
            fb.put(9.61F);
  
            // print the FloatBuffer
            System.out.println("Original FloatBuffer:  "
                               + Arrays.toString(fb.array()));
  
            // Reads the float at this buffer's current position
            // using get() method
            float value = fb.get();
  
            // print the Float value
            System.out.println("\nFloat Value: " + value);
  
            // Reads the  float at this buffer's next position
            // using get() method
            System.out.print("\nsince the buffer current position is incremented");
            System.out.print(" to greater than its limit ");
  
            float value1 = fb.get();
  
            // print the Float value
            System.out.print("\nNext Float Value: " + value1);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("\nIllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("\nReadOnlyBufferException catched");
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("\nException throws : " + e);
        }
    }
}
输出:
Original FloatBuffer:  [8.56, 9.61, 0.0]

Float Value: 0.0

since the buffer current position is incremented to greater than its limit 
Exception throws : java.nio.BufferUnderflowException

获取(整数索引)

FloatBuffer 的get(int index)方法用于读取指定索引处的文章。

句法 :

public abstract float get(int index)

参数:此方法以索引(将读取浮点数的索引)作为参数。

返回值:此方法返回给定索引处的浮点值

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

以下是说明 get(int index) 方法的示例:

示例 1:

// Java program to demonstrate
// get(int index) method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the FloatBuffer
        int capacity = 3;
  
        // Creating the FloatBuffer
        try {
  
            // creating object of floatbuffer
            // and allocating size capacity
            FloatBuffer fb = FloatBuffer.allocate(capacity);
  
            // putting the value in floatbuffer
            fb.put(8.56F);
            fb.put(9.61F);
            fb.put(6.61F);
  
            // print the FloatBuffer
            System.out.println("Original FloatBuffer:  "
                               + Arrays.toString(fb.array()));
  
            // Reads the float at the index 0 of the floatbuffer
            // using get() method
            float value0 = fb.get(0);
  
            // print the Float value
            System.out.println("\nFloat Value at index 0: " + value0);
  
            // Reads the float at the index 1 of the floatbuffer
            // using get() method
            float value1 = fb.get(1);
  
            // print the Float value
            System.out.println("\nFloat Value at index 1: " + value1);
  
            // Reads the float at the index 2 of the floatbuffer
            // using get() method
            float value2 = fb.get(2);
  
            // print the Float value
            System.out.println("\nFloat Value at index 2: " + value2);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("\nIllegalArgumentException catched");
        }
  
        catch (IndexOutOfBoundsException e) {
  
            System.out.println("\nReadOnlyBufferException catched");
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("\nException throws : " + e);
        }
    }
}
输出:
Original FloatBuffer:  [8.56, 9.61, 6.61]

Float Value at index 0: 8.56

Float Value at index 1: 9.61

Float Value at index 2: 6.61

示例 2:

// Java program to demonstrate
// get() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Declaring the capacity of the FloatBuffer
        int capacity = 3;
  
        // Creating the FloatBuffer
        try {
  
            // creating object of floatbuffer
            // and allocating size capacity
            FloatBuffer fb = FloatBuffer.allocate(capacity);
  
            // putting the value in floatbuffer
            fb.put(8.56F);
            fb.put(9.61F);
            fb.put(6.61F);
  
            // print the FloatBuffer
            System.out.println("Original FloatBuffer:  "
                               + Arrays.toString(fb.array()));
  
            // Reads the float at the index 0 of the floatbuffer
            // using get() method
            float value0 = fb.get(0);
  
            // print the Float value
            System.out.println("\nFloat Value at index 0: " + value0);
  
            // Reads the float at the index 1 of the floatbuffer
            // using get() method
            float value1 = fb.get(1);
  
            // print the Float value
            System.out.println("\nFloat Value at index 1: " + value1);
  
            // Reads the float at the index 2 of the floatbuffer
            // using get() method
            System.out.println("\nTrying to get the float"
                               + " of index greater than its limit ");
            float value2 = fb.get(4);
  
            // print the Float value
            System.out.println("\nFloat Value at index 2: " + value2);
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (IndexOutOfBoundsException e) {
  
            System.out.println("Exception thrown: " + e);
        }
  
        catch (BufferUnderflowException e) {
  
            System.out.println("Exception throws : " + e);
        }
    }
}
输出:
Original FloatBuffer:  [8.56, 9.61, 6.61]

Float Value at index 0: 8.56

Float Value at index 1: 9.61

Trying to get the float of index greater than its limit 
Exception thrown: java.lang.IndexOutOfBoundsException