在 Java 中 ByteBuffer compareTo() 方法
可以使用類 java.nio.ByteBuffer 中的方法 compareTo() 將一個緩衝區與另一個緩衝區進行比較。如果緩衝區小於給定的緩衝區,則此方法返回一個負整數;如果緩衝區等於給定的緩衝區,則返回零;如果緩衝區大於給定的緩衝區,則返回一個正整數。
演示此功能的程式如下 -
示例
import java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { ByteBuffer buffer1 = ByteBuffer.allocate(n); buffer1.put((byte)1); buffer1.put((byte)2); buffer1.put((byte)3); buffer1.put((byte)4); buffer1.put((byte)5); buffer1.rewind(); System.out.println("The first ByteBuffer is: " + Arrays.toString(buffer1.array())); ByteBuffer buffer2 = ByteBuffer.allocate(n); buffer2.put((byte)1); buffer2.put((byte)2); buffer2.put((byte)3); buffer2.put((byte)4); buffer2.put((byte)5); buffer2.rewind(); System.out.println("The second ByteBuffer is: " + Arrays.toString(buffer2.array())); int val = buffer1.compareTo(buffer2); if (val == 0) System.out.println("
Both the buffers are lexicographically equal"); else if (val > 0) System.out.println("
The first buffer is lexicographically greater than the second buffer"); else System.out.println("
The second buffer is lexicographically greater than the first buffer"); } catch (IllegalArgumentException e) { System.out.println("Error!!! IllegalArgumentException"); } catch (ReadOnlyBufferException e) { System.out.println("Error!!! ReadOnlyBufferException"); } } }
輸出
The first ByteBuffer is: [1, 2, 3, 4, 5] The second ByteBuffer is: [1, 2, 3, 4, 5] Both the buffers are lexicographically equal
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