Java DoubleBuffer slice()用法及代碼示例

java.nio.DoubleBuffer類的slice()方法用於創建一個新的雙緩衝區，其內容是給定緩衝區內容的共享子序列。

新緩衝區的內容將從該緩衝區的當前位置開始。對該緩衝區內容的更改將在新緩衝區中可見，反之亦然。這兩個緩衝區的位置，限製和標記值將是獨立的。

新緩衝區的位置將為零，其容量和限製將為該緩衝區中剩餘的雙精度數，並且其標記將不確定。當且僅當該緩衝區是直接緩衝區時，新緩衝區才是直接緩衝區；當且僅當該緩衝區是隻讀緩衝區時，新緩衝區才是隻讀緩衝區。

用法:

public abstract DoubleBuffer slice()

返回值：此方法返回新的雙緩衝區。

下麵是說明slice()方法的示例：

範例1：

// Java program to demonstrate 
// slice() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the DoubleBuffer 
        int capacity = 10; 
  
        // Creating the DoubleBuffer 
        try { 
  
            // creating object of Doublebuffer 
            // and allocating size capacity 
            DoubleBuffer fb1 = DoubleBuffer.allocate(capacity); 
  
            // putting the value in Doublebuffer 
            fb1.put(8.56F); 
            fb1.put(9.61F); 
  
            // print the DoubleBuffer 
            System.out.println("Original DoubleBuffer: "
                               + Arrays.toString(fb1.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb1.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb1.capacity()); 
  
            // Creating a shared subsequance buffer of given DoubleBuffer 
            // using slice() method 
            DoubleBuffer fb2 = fb1.slice(); 
  
            // print the shared subsequance buffer 
            System.out.println("\nshared subsequance DoubleBuffer: "
                               + Arrays.toString(fb2.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb2.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb2.capacity()); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

輸出：

Original DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

position:  2

capacity:  10

shared subsequance DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

position:  0

capacity:  8

範例2：

// Java program to demonstrate 
// slice() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the DoubleBuffer 
        int capacity = 10; 
  
        // Creating the DoubleBuffer 
        try { 
  
            // creating object of Doublebuffer 
            // and allocating size capacity 
            DoubleBuffer fb1 = DoubleBuffer.allocate(capacity); 
  
            // putting the value in Doublebuffer 
            fb1.put(8.56F); 
            fb1.put(9.61F); 
            fb1.put(0.56F); 
            fb1.put(3.61F); 
  
            // print the DoubleBuffer 
            System.out.println("Original DoubleBuffer: "
                               + Arrays.toString(fb1.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb1.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb1.capacity()); 
  
            // Creating a shared subsequance buffer of given DoubleBuffer 
            // using slice() method 
            DoubleBuffer fb2 = fb1.slice(); 
            fb2.put(2.34F); 
            fb2.put(6.34F); 
  
            // print the shared subsequance buffer 
            System.out.println("\nshared subsequance DoubleBuffer: "
                               + Arrays.toString(fb2.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb2.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb2.capacity()); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

輸出：

Original DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.5600000023841858, 3.609999895095825, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

position:  4

capacity:  10

shared subsequance DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.5600000023841858, 3.609999895095825, 2.3399999141693115, 6.340000152587891, 0.0, 0.0, 0.0, 0.0]

position:  2

capacity:  6

相關用法

注：本文由純淨天空篩選整理自pawan_asipu大神的英文原創作品 DoubleBuffer slice() 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。