Java DoubleStream noneMatch()用法及代碼示例

DoubleStream noneMatch(DoublePredicate謂詞)返回此流中是否沒有元素與提供的謂詞匹配。如果不一定要確定結果，則可能不會評估所有元素上的謂詞。這是短路端子操作。如果出現無限輸入時，端子操作可能會在有限時間內終止，則該端子操作會發生短路。
用法:

boolean noneMatch(DoublePredicate predicate)

Where, DoublePredicate represents a predicate 
(boolean-valued function) of one double-valued argument.

返回值：如果流中的所有元素都與提供的謂詞匹配，或者流為空，則該函數返回true，否則返回false。

注意：如果流為空，則返回true，並且不評估謂詞。

示例1:noneMatch()函數，用於檢查DoubleStream的元素是否可被5整除。

// Java code for DoubleStream noneMatch 
// (DoublePredicate predicate) to check whether 
// no element of this stream match 
// the provided predicate. 
import java.util.*; 
import java.util.stream.DoubleStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // Creating an DoubleStream 
        DoubleStream stream = 
              DoubleStream.of(3.2, 5.0, 9.3, 12.4, 14.7); 
  
        // Check if no element of stream 
        // is divisible by 5 using 
        // DoubleStream noneMatch(DoublePredicate predicate) 
        boolean answer = 
             stream.noneMatch(num -> num % 5 == 0); 
  
        // Displaying the result 
        System.out.println(answer); 
    } 
}

輸出：

false

示例2:noneMatch()函數，用於檢查兩個DoubleStream串聯後獲得的DoubleStream中的元素是否不小於2。

// Java code for DoubleStream noneMatch 
// (DoublePredicate predicate) to check whether 
// no element of this stream match 
// the provided predicate. 
import java.util.*; 
import java.util.stream.DoubleStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // Creating an DoubleStream after 
        // concatenating two DoubleStreams 
        DoubleStream stream = DoubleStream.concat( 
            DoubleStream.of(3.3, 4.2, 5.1, 6.6), 
            DoubleStream.of(7.2, 8.3, 9.1, 10.5)); 
  
        // Check if no element of stream 
        // is less than 2 using 
        // DoubleStream noneMatch(DoublePredicate predicate) 
        boolean answer = stream.noneMatch(num -> num < 2); 
  
        // Displaying the result 
        System.out.println(answer); 
    } 
}

輸出：

true

示例3:noneMatch()函數，以顯示流是否為空，然後返回true。

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

輸出：

true

相關用法

注：本文由純淨天空篩選整理自Sahil_Bansall大神的英文原創作品 DoubleStream noneMatch() in Java with examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。