java.nio.FloatBuffer類的compact()方法用於壓縮給定的緩衝區。
緩衝區當前位置與其極限之間的值將複製到緩衝區的開頭。然後將緩衝區的位置設置為n + 1,並將其限製設置為其容量。緩衝區的位置設置為複製的浮點數。
用法:
public abstract FloatBuffer compact()
返回值:此方法返回具有與此緩衝區相同內容的新FloatBuffer。
異常:如果此緩衝區是隻讀的,則此方法引發ReadOnlyBufferException。
以下示例程序旨在說明compact()方法:
範例1:
// Java program to demonstrate
// compact() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the FloatBuffer
int capacity = 10;
// Creating the FloatBuffer
// 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(9.61F);
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb.array()));
System.out.println("Position: " + fb.position());
System.out.println("limit: " + fb.limit());
// Creating a compacted FloatBuffer of same FloatBuffer
// using compact() method
FloatBuffer floatBuffer = fb.compact();
// print the FloatBuffer
System.out.println("\nCompacted FloatBuffer: "
+ Arrays.toString(floatBuffer.array()));
System.out.println("Position: " + floatBuffer.position());
System.out.println("limit: " + floatBuffer.limit());
// putting the value in compacted floatbuffer
floatBuffer.put(9.61F);
// print the FloatBuffer
System.out.println("\nUpdated Compacted FloatBuffer: "
+ Arrays.toString(floatBuffer.array()));
System.out.println("Position: " + floatBuffer.position());
System.out.println("limit: " + floatBuffer.limit());
}
}
輸出:
Original FloatBuffer: [8.56, 9.61, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] Position: 3 limit: 10 Compacted FloatBuffer: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] Position: 7 limit: 10 Updated Compacted FloatBuffer: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9.61, 0.0, 0.0] Position: 8 limit: 10
範例2:
// Java program to demonstrate
// compact() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the FloatBuffer
int capacity = 10;
// 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(9.61F);
fb.rewind();
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer fb1 = fb.asReadOnlyBuffer();
// print the ReadOnlyBuffer
System.out.print("ReadOnlyBuffer FloatBuffer: ");
while (fb1.hasRemaining())
System.out.print(fb1.get() + ", ");
System.out.println("");
// print the Position of FloatBuffer fb
System.out.println("\nPosition: " + fb.position());
// print the Limit of FloatBuffer fb
System.out.println("\nlimit: " + fb.limit());
// Creating a compacted FloatBuffer of same ReadOnlyBuffer
// using compact() method
System.out.println("\nTrying to compact the ReadOnlyBuffer fb1");
FloatBuffer floatBuffer = fb1.compact();
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws " + e);
}
}
}
輸出:
ReadOnlyBuffer FloatBuffer: 8.56, 9.61, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Position: 0 limit: 10 Trying to compact the ReadOnlyBuffer fb1 Exception throws java.nio.ReadOnlyBufferException
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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 FloatBuffer compact() 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。