Java中的 IntStream noneMatch() 示例

IntStream noneMatch(IntPredicate predicate)返回此流的任何元素是否与提供的谓词匹配。如果不需要确定结果，它可能不会评估所有元素的谓词。这是一个短路端子操作。如果一个终端操作在有无限输入时可能会在有限时间内终止，那么它就是短路的。
句法 ：

boolean noneMatch(IntPredicate predicate)

Where, IntPredicate represents a predicate (boolean-valued function)
of one int-valued argument and the function returns true if either
all elements of the stream match the provided predicate or 
the stream is empty, otherwise false.

注意：如果流为空，则返回 true 并且不评估谓词。

示例 1： noneMatch()函数检查 IntStream 的任何元素是否可被 5 整除。

// Java code for IntStream noneMatch
// (Predicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.IntStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Creating an IntStream
        IntStream stream = IntStream.of(3, 5, 9, 12, 14);
  
        // Check if no element of stream
        // is divisible by 5 using
        // IntStream noneMatch(Predicate predicate)
        boolean answer = stream.noneMatch(num -> num % 5 == 0);
  
        // Displaying the result
        System.out.println(answer);
    }
}

输出：

false

例2： noneMatch()函数检查两个IntStream拼接后得到的IntStream中是否没有元素小于2。

// Java code for IntStream noneMatch
// (Predicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.IntStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an IntStream after concatenating
        // two IntStreams
        IntStream stream = IntStream.concat(IntStream.of(3, 4, 5, 6),
                                            IntStream.of(7, 8, 9, 10));
  
        // Check if no element of stream
        // is less than 2 using
        // IntStream noneMatch(Predicate predicate)
        boolean answer = stream.noneMatch(num -> num < 2);
  
        // Displaying the result
        System.out.println(answer);
    }
}

输出：

true

示例 3： noneMatch()函数显示流是否为空，则返回 true。

// Java code for IntStream noneMatch
// (Predicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.IntStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an empty IntStream
        IntStream stream = IntStream.empty();
  
        // Using IntStream noneMatch() on empty stream
        boolean answer = stream.noneMatch(num -> true);
  
        // Displaying the result
        System.out.println(answer);
    }
}

输出：

true