JAVA EE: Terminal operations[match] in Java 8 Stream

Thursday 24 August 2017

Terminal operations[match] in Java 8 Stream | Streams in Java 8

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Terminal operations[match] in Java 8 Stream | Streams in Java 8

StreamMatchDemo.java

import java.util.Arrays;
import java.util.List;

public class StreamMatchDemo
{
    public static void main(String[] args)
    {
        List<Integer> numberList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);

        /*
         * Returns:true if either all elements of the stream match the
         * provided predicate or the stream is empty, otherwise false
         */
        boolean isAllNumbersLargerThanFive = numberList.stream()
                                                        .allMatch(i -> i > 5);
        System.out.println(isAllNumbersLargerThanFive); // false

        /*
         * Returns:true if any elements of the stream match the
         * provided predicate, otherwise false
         */
        boolean hasNumberLargerThanFive = numberList.stream()
                                                    .anyMatch(i -> i > 5);
        System.out.println(hasNumberLargerThanFive); // true

        /*
         * Returns:true if either no elements of the stream match the
         * provided predicate or the stream is empty, otherwise false
         */
        boolean isNoneNumberLargerThanTen = numberList.stream()
                                                      .noneMatch(i -> i > 10);
        System.out.println(isNoneNumberLargerThanTen); // true
    }
}