Java中的ByteBuffer compact()方法
可以使用compact()java.nio.ByteBuffer类中的方法压缩缓冲区。此方法不需要参数，它返回具有与原始缓冲区相同内容的新的压缩ByteBuffer。如果缓冲区是只读的，则抛出ReadOnlyBufferException。
演示此的程序如下所示-
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("\nThe 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");
}
}
}输出结果
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