getFloat()
java.nio.ByteBuffer類的getFloat()方法用於讀取此緩衝區當前位置的下四個字節,根據當前字節順序將其組成一個float值,然後將位置增加4。
用法:
public abstract float getFloat()
返回值:此方法返回緩衝區當前位置的浮點值。
異常:如果此緩衝區中剩餘的字節數少於四個,則此方法將引發BufferUnderflowException。
下麵是說明getFloat()方法的示例:
範例1:
// Java program to demonstrate
// getFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 8;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the double value in the bytebuffer
bb.asFloatBuffer()
.put(12.3f)
.put(28.44f);
// rewind the Bytebuffer
bb.rewind();
// print the ByteBuffer
System.out.println("Original ByteBuffer: ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
// rewind the Bytebuffer
bb.rewind();
// Reads the Float at this buffer's current position
// using getFloat() method
float value = bb.getFloat();
// print the float value
System.out.println("\n\nByte Value: " + value);
// Reads the float at this buffer's next position
// using getFloat() method
float value1 = bb.getFloat();
// print the float value
System.out.print("\nNext Byte Value: " + value1);
}
catch (BufferUnderflowException e) {
System.out.println("\nException Thrown : " + e);
}
}
}
輸出:
Original ByteBuffer: 12.3 28.44 Byte Value: 12.3 Next Byte Value: 28.44
範例2:
// Java program to demonstrate
// getFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 8;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the double value in the bytebuffer
bb.asFloatBuffer()
.put(12.3f)
.put(28.44f);
// rewind the Bytebuffer
bb.rewind();
// print the ByteBuffer
System.out.println("Original ByteBuffer: ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
// rewind the Bytebuffer
bb.rewind();
// Reads the Float at this buffer's current position
// using getFloat() method
float value = bb.getFloat();
// print the float value
System.out.println("\n\nByte Value: " + value);
// Reads the float at this buffer's next position
// using getFloat() method
float value1 = bb.getFloat();
// print the float value
System.out.println("\nNext Byte Value: " + value1);
// Reads the float at this buffer's next position
// using getFloat() method
float value2 = bb.getFloat();
}
catch (BufferUnderflowException e) {
System.out.println("\nthere are fewer "
+ "than eight bytes remaining"
+ " in this buffer");
System.out.println("Exception Thrown : " + e);
}
}
}
輸出:
Original ByteBuffer: 12.3 28.44 Byte Value: 12.3 Next Byte Value: 28.44 there are fewer than eight bytes remaining in this buffer Exception Thrown : java.nio.BufferUnderflowException
參考: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getFloat–
getFloat(int索引)
java.nio.ByteBuffer的getFloat(int index)方法用於讀取給定索引處的四個字節,並根據當前字節順序將它們組成一個float值。
用法:
public abstract float getFloat(int index)
參數:此方法將index作為參數,即將從中讀取Byte的索引。
返回值:此方法返回給定索引處的float值。
異常:如果index為負或不小於緩衝區的限製,則此方法將引發IndexOutOfBoundsException。
以下示例說明了getFloat(int index)方法:
範例1:
// Java program to demonstrate
// getFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 8;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the double value in the bytebuffer
bb.asFloatBuffer()
.put(12.3f)
.put(28.44f);
// rewind the Bytebuffer
bb.rewind();
// print the ByteBuffer
System.out.println("Original ByteBuffer: ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
// rewind the Bytebuffer
bb.rewind();
// Reads the Float at this buffer's current position
// using getFloat() method
float value = bb.getFloat(0);
// print the float value
System.out.println("\n\nByte Value: " + value);
// Reads the float at this buffer's next position
// using getFloat() method
float value1 = bb.getFloat(4);
// print the float value
System.out.println("\nNext Byte Value: " + value1);
}
catch (IndexOutOfBoundsException e) {
System.out.println("\nindex is negative or smaller"
+ " than the buffer's limit, "
+ "minus seven");
System.out.println("Exception Thrown : " + e);
}
}
}
輸出:
Original ByteBuffer: 12.3 28.44 Byte Value: 12.3 Next Byte Value: 28.44
範例2:
// Java program to demonstrate
// getFloat() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 8;
// Creating the ByteBuffer
try {
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the double value in the bytebuffer
bb.asFloatBuffer()
.put(12.3f)
.put(28.44f);
// rewind the Bytebuffer
bb.rewind();
// print the ByteBuffer
System.out.println("Original ByteBuffer: ");
for (int i = 1; i <= capacity / 4; i++)
System.out.print(bb.getFloat() + " ");
// rewind the Bytebuffer
bb.rewind();
// Reads the Float at this buffer's current position
// using getFloat() method
float value = bb.getFloat(0);
// print the float value
System.out.println("\n\nByte Value: " + value);
// Reads the float at this buffer's next position
// using getFloat() method
float value1 = bb.getFloat(6);
// print the float value
System.out.println("\nNext Byte Value: " + value1);
}
catch (IndexOutOfBoundsException e) {
System.out.println("\nindex is negative or"
+ " smaller than the buffer's "
+ "limit, minus seven");
System.out.println("Exception Thrown : " + e);
}
}
}
輸出:
Original ByteBuffer: 12.3 28.44 Byte Value: 12.3 index is negative or smaller than the buffer's limit, minus seven Exception Thrown : java.lang.IndexOutOfBoundsException
參考: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getFloat-int-
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注:本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 ByteBuffer getFloat() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。