Java 中的 DoubleBuffer compareTo()方法，带示例
原文:https://www . geesforgeks . org/double buffer-compare to-method-in-Java-with-examples/
java.nio.DoubleBuffer 类的 compareTo() 方法用于比较一个缓冲区和另一个缓冲区。两个双缓冲区通过按字典顺序比较剩余元素的序列来进行比较，而不考虑每个序列在其相应缓冲区内的起始位置。除了-0.0 和 0.0 被认为是相等的之外，对浮点元素的比较就像调用 Double.compare(Double，double)一样。双倍。通过这种方法，NaN 被认为等于它自己，并且大于所有其他双精度值(包括 double。正数 _ 无穷大)。双缓冲区无法与任何其他类型的对象相比。
语法:
public int compareTo(DoubleBuffer that)
参数:该方法以一个双缓冲区对象作为参数，与该缓冲区进行比较。
返回值:该方法返回一个负整数、零或一个正整数 r，因为该缓冲区小于、等于或大于给定的缓冲区。
下面是说明 compareTo()方法的示例:
示例 1: 当两个双缓冲区相等时。
// Java program to demonstrate
// compareTo() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the db
int capacity1 = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer db
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity1);
// putting the value in db
db.put(9.56);
db.put(7.61);
db.put(4.61);
// revind the Double buffer
db.rewind();
// print the DoubleBuffer
System.out.println("DoubleBuffer db: "
+ Arrays.toString(db.array()));
// creating object of Doublebuffer db1
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity1);
// putting the value in db1
db1.put(9.56);
db1.put(7.61);
db1.put(4.61);
// revind the Double buffer
db1.rewind();
// print the DoubleBuffer
System.out.println("DoubleBuffer db1: "
+ Arrays.toString(db1.array()));
// compare both buffer and store the value into integer
int i = db.compareTo(db1);
// if else condition
if (i == 0)
System.out.println("\nboth buffer are lexicographically equal");
else if (i >= 0)
System.out.println("\ndb is lexicographically greater than db1");
else
System.out.println("\ndb is lexicographically less than db1");
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
DoubleBuffer db: [9.56, 7.61, 4.61]
DoubleBuffer db1: [9.56, 7.61, 4.61]
both buffer are lexicographically equal
示例 2: 当该双缓冲区大于传递的双缓冲区时
// Java program to demonstrate
// compareTo() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the db
int capacity1 = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer db
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity1);
// putting the value in db
db.put(9.56);
db.put(7.61);
db.put(4.61);
// revind the Double buffer
db.rewind();
// print the DoubleBuffer
System.out.println("DoubleBuffer db: "
+ Arrays.toString(db.array()));
// creating object of Doublebuffer db1
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity1);
// putting the value in db1
db1.put(8.56);
db1.put(7.61);
db1.put(4.61);
// revind the Double buffer
db1.rewind();
// print the DoubleBuffer
System.out.println("DoubleBuffer db1: "
+ Arrays.toString(db1.array()));
// compare both buffer and store the value into integer
int i = db.compareTo(db1);
// if else condition
if (i == 0)
System.out.println("\nboth buffer are lexicographically equal");
else if (i >= 0)
System.out.println("\ndb is lexicographically greater than db1");
else
System.out.println("\ndb is lexicographically less than db1");
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
DoubleBuffer db: [9.56, 7.61, 4.61]
DoubleBuffer db1: [8.56, 7.61, 4.61]
db is lexicographically greater than db1
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