IntStream mapToLong()返回LongStream,该LongStream包括将给定函数应用于此流的元素的结果。
注意:IntStream mapToLong()是中间操作。这些操作总是很懒。在Stream实例上调用中间操作,并在完成处理后将中间实例作为输出提供。
用法:
LongStream mapToLong(IntToLongFunction mapper)
参数:
- LongStream : 一系列原始long值元素。这是Stream的长期原始专业化。
- mapper : 适用于每个元素的无状态函数。
返回值:该函数返回LongStream,其中包括将给定函数应用于此流的元素的结果。
示例1:
// Java code for LongStream mapToLong
// (IntToLongFunction mapper)
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an IntStream
IntStream stream = IntStream.of(2, 4, 6, 8, 10);
// Using LongStream mapToLong(IntToLongFunction mapper)
// to return a LongStream consisting of the
// results of applying the given function to
// the elements of this stream.
LongStream stream1 = stream.mapToLong(num -> (long)num);
// Displaying the elements in stream1
stream1.forEach(System.out::println);
}
}
输出:
2 4 6 8 10
示例2:
// Java code for LongStream mapToLong
// (IntToLongFunction mapper)
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an IntStream
IntStream stream = IntStream.of(2, 4, 6, 8, 10);
// Using LongStream mapToLong(IntToLongFunction mapper)
// to return a LongStream consisting of the
// results of applying the given function to
// the elements of this stream.
LongStream stream1 = stream.mapToLong(num -> (long)num + Integer.MAX_VALUE);
// Displaying the elements in stream1
stream1.forEach(System.out::println);
}
}
输出:
2147483649 2147483651 2147483653 2147483655 2147483657
示例3:
// Java code for LongStream mapToLong
// (IntToLongFunction mapper)
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an IntStream
IntStream stream = IntStream.range(5, 10);
// Using LongStream mapToLong(IntToLongFunction mapper)
// to return a LongStream consisting of the
// results of applying the given function to
// the elements of this stream.
LongStream stream1 = stream.mapToLong(num -> (long)num - 20);
// Displaying the elements in stream1
stream1.forEach(System.out::println);
}
}
输出:
-15 -14 -13 -12 -11
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注:本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 IntStream mapToLong() in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。