Java中的DoubleBuffer compareTo()方法

可以使用compareTo()类java.nio.DoubleBuffer中的方法将一个缓冲区与另一个缓冲区进行比较。如果缓冲区小于给定缓冲区，则此方法返回负整数；如果缓冲区等于给定缓冲区，则返回零；如果缓冲区大于给定缓冲区，则返回正整数。

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 buffer1 = DoubleBuffer.allocate(n);
         buffer1.put(4.5D);
         buffer1.put(1.2D);
         buffer1.put(3.9D);
         buffer1.put(7.5D);
         buffer1.put(5.8D);
         buffer1.rewind();
         System.out.println("The first DoubleBuffer is: " + Arrays.toString(buffer1.array()));
         DoubleBuffer buffer2 = DoubleBuffer.allocate(n);
         buffer2.put(4.5D);
         buffer2.put(1.2D);
         buffer2.put(3.9D);
         buffer2.put(7.5D);
         buffer2.put(5.8D);
         buffer2.rewind();
         System.out.println("The second DoubleBuffer is: " + Arrays.toString(buffer2.array()));
         int val = buffer1.compareTo(buffer2);
         if (val == 0)
            System.out.println("\nBoth the buffers are lexicographically equal");
         else if (val > 0)
            System.out.println("\nThe first buffer is lexicographically greater than the second buffer");
         else
            System.out.println("\nThe 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");
      }
   }
}

上面程序的输出如下-

输出结果

The first DoubleBuffer is: [4.5, 1.2, 3.9, 7.5, 5.8]
The second DoubleBuffer is: [4.5, 1.2, 3.9, 7.5, 5.8]

Both the buffers are lexicographically equal