Java FloatBuffer get()方法及实例

get()

java.nio.FloatBuffer 类的 get() 方法用于读取指定缓冲区当前位置的浮点数，然后增加该位置。

语法:

public abstract float get()

返回值： 该方法返回缓冲区当前位置的浮点值。

抛出： 该方法抛出 BufferUnderflowException --如果缓冲区的当前位置没有小于它的极限值，那么就会抛出这个异常。

下面是说明get()方法的例子。

例子 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: 8.56Next Float Value: 9.61

例子 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: 0.0since the buffer current position is incremented to greater than its limit Exception throws : java.nio.BufferUnderflowException

get(int index)

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

语法:

public abstract float get(int index)

参数： 该方法以 index （将读取浮点数的索引）为参数。

返回值： 该方法返回给定索引处的浮点数。

异常： 该方法抛出 IndexOutOfBoundsException。 如果索引为负数或不小于缓冲区的极限值，则抛出该异常。

下面是说明get(int index)方法的例子。

例子 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: 8.56Float Value at index 1: 9.61Float Value at index 2: 6.61

例子 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: 8.56Float Value at index 1: 9.61Trying to get the float of index greater than its limit Exception thrown: java.lang.IndexOutOfBoundsException