ByteBuffer compact() 方法在 Java 中
缓冲区可以通过 java.nio.ByteBuffer 类中的 compact() 方法压缩。此方法无需参数,并使用相同内容返回新的压缩 ByteBuffer,并且如果是只读缓冲区,则会引发 ReadOnlyBufferException。
对此进行说明的程序如下 −
示例
import java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { ByteBuffer buffer = ByteBuffer.allocate(n); buffer.put((byte)5); buffer.put((byte)8); buffer.put((byte)3); System.out.println("The Original ByteBuffer is: " + Arrays.toString(buffer.array())); System.out.println("The position is: " + buffer.position()); System.out.println("The limit is: " + buffer.limit()); ByteBuffer bufferCompact = buffer.compact(); System.out.println("
The Compacted ByteBuffer 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"); } } }
输出
The Original ByteBuffer is: [5, 8, 3, 0, 0] The position is: 3 The limit is: 5 The Compacted ByteBuffer is: [0, 0, 3, 0, 0] The position is: 2 The limit is: 5
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