流排序()在 Java 中
Stream sorted() 返回一个由这个流的元素组成的流，按照自然顺序排序。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，当处理新的元素时，它可以包含来自以前看到的元素的状态。
语法:
Stream<T> sorted()
Where, Stream is an interface and T
is the type of stream elements.
异常:如果该流的元素不可比较，则在执行终端操作时可能会抛出Java . lang . class castexception。
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 elements
// sorted in their natural order
import java.util.*;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a list of integers
List<Integer> list = Arrays.asList(-9, -18, 0, 25, 4);
System.out.println("The sorted stream is : ");
// displaying the stream with elements
// sorted in natural order
list.stream().sorted().forEach(System.out::println);
}
}
Output:
The sorted stream is :
-18
-9
0
4
25
例 2 :
// Implementation of Stream.sorted()
// to get a stream of elements
// sorted in their natural order
import java.util.*;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a list of strings
List<String> list = Arrays.asList("Geeks", "for",
"GeeksQuiz", "GeeksforGeeks", "GFG");
System.out.println("The sorted stream is : ");
// displaying the stream with elements
// sorted in their natural order
list.stream().sorted().forEach(System.out::println);
}
}
Output:
The sorted stream is :
GFG
Geeks
GeeksQuiz
GeeksforGeeks
for
例 3 :
// Using stream sorted to sort a stream
// of user defined class objects
import java.util.*;
class Point
{
Integer x, y;
Point(Integer x, Integer y) {
this.x = x;
this.y = y;
}
public String toString() {
return this.x + ", "+ this.y;
}
}
class GFG
{
public static void main(String[] args)
{
List<Point> aList = new ArrayList<>();
aList.add(new Point(10, 20));
aList.add(new Point(5, 10));
aList.add(new Point(1, 100));
aList.add(new Point(50, 2000));
// displaying the stream with elements
// sorted according to x coordinate
aList.stream()
.sorted((p1, p2)->p1.x.compareTo(p2.x))
.forEach(System.out::println);
}
}
Output:
1, 100
5, 10
10, 20
50, 2000
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