Java中的DoubleBuffer compact()方法
可以使用compact()类java.nio.DoubleBuffer中的方法来压缩缓冲区。此方法不需要参数，它返回新的压缩DoubleBuffer，其内容与原始缓冲区相同。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 {
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("\nThe 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");
}
}
}上面程序的输出如下-
输出结果
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