Java中的流排序(比较器比较器)方法
Stream sorted(Comparator compare)返回一个由该流的元素组成的流,根据提供的 Comparator进行排序。对于有序流,排序方法是稳定的,但对于无序流,不能保证稳定性。它是一个有状态的中间操作,即在处理新元素时,它可以合并来自先前看到的元素的状态。在Java 8 中,Comparator 可以使用 lambda 表达式来实例化。我们还可以反转自然排序以及 Comparator 提供的排序。
句法 :
Stream sorted(Comparator super T> comparator)
Where, Stream is an interface and T
is the type of stream elements.
comparator is used to compare stream elements.
下面给出了一些示例,以更好地理解该函数的实现。
示例 1:
// Implementation of Stream.sorted()
// to get a stream of sorted elements
// according to the provided Comparator
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a list of Integers
List list = Arrays.asList(5, -10, 7, -18, 23);
System.out.println("The sorted stream according "
+ "to provided Comparator is : ");
// Displaying the list of Strings in
// reverse order after sorting
list.stream().sorted(Comparator.reverseOrder()).
forEach(System.out::println);
}
}
输出 :
The sorted stream according to provided Comparator is :
23
7
5
-10
-18
示例 2:
// Implementation of Stream.sorted()
// to get a stream of sorted elements
// according to the provided Comparator
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a list of Strings
List list = Arrays.asList("Geeks", "for",
"GeeksforGeeks", "GeeksQuiz", "GFG");
System.out.println("The sorted stream according "
+ "to provided Comparator is : ");
// Displaying the list of Strings in
// reverse order after sorting
list.stream().sorted(Comparator.reverseOrder()).
forEach(System.out::println);
}
}
输出 :
The sorted stream according to provided Comparator is :
for
GeeksforGeeks
GeeksQuiz
Geeks
GFG
示例 3:
// Implementation of Stream.sorted()
// to get a stream of sorted elements
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an array of Strings
String[] array = { "GFG", "Geeks", "for",
"GeeksforGeeks", "GeeksQuiz" };
System.out.println("The sorted stream is :");
// sorting the elements of array based
// on their last character
Stream.of(array).sorted((str1, str2)
-> Character.compare(str1
.charAt(str1.length() - 1),
str2.charAt(str2.length() - 1)))
. forEach(System.out::println);
}
}
输出 :
The sorted stream is :
GFG
for
Geeks
GeeksforGeeks
GeeksQuiz