Stream noneMatch(Predicate predicate) returns whether no elements of this stream match the provided predicate. It may not evaluate the predicate on all elements if not necessary for determining the result. This is a short-circuiting terminal operation. A terminal operation is short-circuiting if, when presented with infinite input, it may terminate in finite time.
Syntax :
boolean noneMatch(Predicate<? super T> predicate) Where, T is the type of the input to the predicate and the function returns true if either no elements of the stream match the provided predicate or the stream is empty, otherwise false.
Note : If the stream is empty then true is returned and the predicate is not evaluated.
Example 1 : To check that there is no string of length 4.
// Java code for Stream noneMatch // (Predicate predicate) to check whether // no elements of this stream match // the provided predicate. import java.util.stream.Stream; class GFG { // Driver code public static void main(String[] args) { // Creating a Stream of Strings Stream<String> stream = Stream.of( "CSE" , "C++" , "Jav" , "DS" ); // Using Stream noneMatch(Predicate predicate) boolean answer = stream.noneMatch(str -> (str.length() == 4 )); // Displaying the result System.out.println(answer); } } |
true
Example 2 : To check that there is no element less than 0.
// Java code for Stream noneMatch // (Predicate predicate) to check whether // no elements of this stream match // the provided predicate. import java.util.*; class GFG { // Driver code public static void main(String[] args) { // Creating a list of Integers List<Integer> list = Arrays.asList( 4 , 0 , 6 , 2 ); // Using Stream noneMatch(Predicate predicate) boolean answer = list.stream().noneMatch(num -> num < 0 ); // Displaying the result System.out.println(answer); } } |
true
Example 3 : To check that there is no element with required characters at required position.
// Java code for Stream noneMatch // (Predicate predicate) to check whether // no elements of this stream match // the provided predicate. import java.util.stream.Stream; class GFG { // Driver code public static void main(String[] args) { // Creating a Stream of Strings Stream<String> stream = Stream.of( "Geeks" , "fOr" , "GEEKSQUIZ" , "GeeksforGeeks" , "CSe" ); // Using Stream noneMatch(Predicate predicate) boolean answer = stream.noneMatch (str -> Character.isUpperCase(str.charAt( 1 )) && Character.isLowerCase(str.charAt( 2 )) && str.charAt( 0 ) == 'f' ); // Displaying the result System.out.println(answer); } } |
false
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