DoubleBuffer compact() 方法在 Java 中
使用 java.nio.DoubleBuffer 類中的 compact() 方法可以對緩衝區進行壓縮。此方法不需要引數,它返回具有與原始緩衝區相同內容的新壓縮 DoubleBuffer。如果緩衝區是隻讀的,則會丟擲 ReadOnlyBufferException。
一個演示此操作的程式如下 −
示例
import java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { DoubleBuffer buffer = DoubleBuffer.allocate(n); buffer.put(1.2D); buffer.put(3.9D); buffer.put(7.5D); System.out.println("The Original DoubleBuffer is: " + Arrays.toString(buffer.array())); System.out.println("The position is: " + buffer.position()); System.out.println("The limit is: " + buffer.limit()); DoubleBuffer bufferCompact = buffer.compact(); System.out.println("
The Compacted DoubleBuffer is: " + Arrays.toString(bufferCompact.array())); System.out.println("The position is: " + bufferCompact.position()); System.out.println("The limit is: " + bufferCompact.limit()); } catch (IllegalArgumentException e) { System.out.println("Error!!! IllegalArgumentException"); } catch (ReadOnlyBufferException e) { System.out.println("Error!!! ReadOnlyBufferException"); } } }
以上程式的輸出如下 −
輸出
The Original DoubleBuffer is: [1.2, 3.9, 7.5, 0.0, 0.0] The position is: 3 The limit is: 5 The Compacted DoubleBuffer is: [0.0, 0.0, 7.5, 0.0, 0.0] The position is: 2 The limit is: 5
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