IntStream非匹配(IntPredicate谓词) 返回此流的元素是否与提供的谓词匹配。如果不是确定结果所必需的,它可能不会对所有元素的谓词求值。这是一个 短路终端操作。 如果终端操作在无限输入时可能在有限时间内终止,则终端操作为短路。 语法:
null
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: 如果流为空,则返回true,并且不计算谓词。
例1: 函数的作用是:检查IntStream的元素是否不能被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: 函数的作用是:检查连接两个IntStream后获得的IntStream中的元素是否小于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
例3: 函数的作用是:显示流是否为空,然后返回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
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