Java 中的 doublestream maptoint()
哎哎哎:# t0]https://www . geeksforgeeks . org/double stream-map point-Java/
DoubleStream mapToInt() 返回一个 IntStream，它由给定函数应用于该流元素的结果组成。
注意:双流 mapToInt()是一个 中间操作。 这些操作总是偷懒。中间操作在流实例上被调用，在它们完成处理后，它们给出一个流实例作为输出。 语法:
IntStream mapToInt(DoubleToIntFunction mapper)
参数:
- IntStream : 一系列原始的 int 值元素。这是流的内部原始特化。
- 映射器:应用于每个元素的无状态函数。
返回值:该函数返回一个 IntStream，该 int stream 由给定函数应用于该流元素的结果组成。
例 1 :
// Java code for IntStream mapToInt
// (DoubleToIntFunction mapper)
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a DoubleStream
DoubleStream stream = DoubleStream.of(2.3, 4.5, 6.4,
8.7, 10.4);
// Using IntStream mapToInt(DoubleToIntFunction mapper)
// to return an IntStream consisting of the
// results of applying the given function to
// the elements of this stream.
IntStream stream1 = stream.mapToInt(num -> (int)num);
// Displaying the elements in stream1
stream1.forEach(System.out::println);
}
}
输出:
2
4
6
8
10
例 2 :
// Java code for IntStream mapToInt
// (DoubleToIntFunction mapper)
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a DoubleStream
DoubleStream stream = DoubleStream.of(2.3, 4.5, 6.4,
8.7, 10.4);
// Using IntStream mapToInt(DoubleToIntFunction mapper)
// to return an IntStream consisting of the
// results of applying the given function to
// the elements of this stream.
IntStream stream1 = stream.mapToInt(num -> (int)num - 10000);
// Displaying the elements in stream1
stream1.forEach(System.out::println);
}
}
输出:
-9998
-9996
-9994
-9992
-9990
例 3 :
// Java code for IntStream mapToInt
// (DoubleToIntFunction mapper)
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a DoubleStream
DoubleStream stream = DoubleStream.of(1.3, 2.4, 3.4,
4.5, 5.7);
// Using IntStream mapToInt(DoubleToIntFunction mapper)
// to return an IntStream consisting of the
// results of applying the given function to
// the elements of this stream.
IntStream stream1 = stream.mapToInt(num -> (int)(num * num * num));
// Displaying the elements in stream1
stream1.forEach(System.out::println);
}
}
输出:
2
13
39
91
185
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