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