Java 中的流排序(比较器比较器)方法
原文:https://www . geesforgeks . org/stream-sorted-comparator-method-Java/
流排序(比较器比较器)返回由该流的元素组成的流，根据比较器提供的进行排序。对于有序流，排序方法是稳定的，但是对于无序流，不保证稳定性。这是一个 有状态的中间操作 ，也就是说，当处理新元素时，它可以合并来自先前看到的元素的状态。在 java 8 中，比较器可以使用λ表达式进行实例化。我们也可以颠倒自然排序以及比较器提供的排序。 语法:****
Stream<T> 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.
下面给出了一些例子，以便更好地理解函数的实现。
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<Integer> 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
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<String> 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
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
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