LongStream noneMatch(LongPredicate谓词)返回此流中是否没有元素与提供的谓词匹配。如果不一定要确定结果,则可能不会评估所有元素上的谓词。这是短路端子操作。如果出现无限输入时,端子操作可能会在有限时间内终止,则该端子操作会发生短路。
用法:
boolean noneMatch(LongPredicate predicate)
参数:
- LongPredicate : 一个long值参数的谓词(布尔值函数)。
返回值:如果流中的所有元素都与提供的谓词匹配,或者流为空,则该函数返回true,否则返回false。
注意:如果流为空,则返回true,并且不评估谓词。
示例1:noneMatch()函数,用于检查LongStream的元素是否可被5整除。
// Java code for LongStream noneMatch
// (LongPredicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an LongStream
LongStream stream = LongStream.of(3L, 5L, 9L, 12L, 14L);
// Check if no element of stream
// is divisible by 5 using
// LongStream noneMatch(LongPredicate predicate)
boolean answer = stream.noneMatch(num -> num % 5 == 0);
// Displaying the result
System.out.println(answer);
}
}
输出:
false
示例2:noneMatch()函数,用于检查将两个LongStream串联后获得的LongStream中的元素是否不小于2。
// Java code for LongStream noneMatch
// (LongPredicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an LongStream after concatenating
// two LongStreams
LongStream stream = LongStream.concat(LongStream.of(3L, 4L, 5L, 6L),
LongStream.of(7L, 8L, 9L, 10L));
// Check if no element of stream
// is less than 2 using
// LongStream noneMatch(LongPredicate predicate)
boolean answer = stream.noneMatch(num -> num < 2);
// Displaying the result
System.out.println(answer);
}
}
输出:
true
示例3:noneMatch()函数,以显示流是否为空,然后返回true。
// Java code for LongStream noneMatch
// (LongPredicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an empty LongStream
LongStream stream = LongStream.empty();
// Using LongStream noneMatch() on empty stream
boolean answer = stream.noneMatch(num -> true);
// Displaying the result
System.out.println(answer);
}
}
输出:
true
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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 LongStream noneMatch() in Java with examples。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。