极客教程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: 8.56
Next 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: 0.0
since 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: 8.56
Float Value at index 1: 9.61
Float 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: 8.56
Float Value at index 1: 9.61
Trying to get the float of index greater than its limit
Exception thrown: java.lang.IndexOutOfBoundsException