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Java 8 Streams - IntStream.allMatch Examples

Java 8 Streams Java Java API 

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Interface:

java.util.stream.IntStream

java.lang.AutoCloseableAutoCloseablejava.util.stream.BaseStreamBaseStreamjava.util.stream.IntStreamIntStreamLogicBig

Method:

boolean allMatch(IntPredicate predicate)

This terminal-short-circuiting operation returns whether all elements match the provided predicate criteria. It returns 'false' on finding the first mismatch hence short-circuiting the operation.

If the stream is empty then this method returns true and the predicate is not evaluated.

Examples


package com.logicbig.example.intstream;

import java.util.stream.IntStream;

public class AllMatchExample {

    public static void main(String... args) {
        IntStream intStream = IntStream.of(1, 2, 3, 2, 5, 4);
        boolean b = intStream.allMatch(AllMatchExample::greaterThanZero);
        System.out.println(b);

        IntStream intStream2 = IntStream.of(1, 2, 3, 2, 5, 4);
        boolean b2 = intStream2.allMatch(AllMatchExample::evenNumber);
        System.out.println(b2);
    }

    private static boolean evenNumber(int i) {
        return i % 2 == 0;
    }

    private static boolean greaterThanZero(int i) {
        return i > 0;
    }
}

Output

true
false




For empty stream this method will always return true. 

package com.logicbig.example.intstream;

import java.util.stream.IntStream;

public class AllMatchExample2 {

    public static void main(String... args) {
        IntStream intStream = IntStream.empty();
        boolean b = intStream.allMatch(i -> false);
        System.out.println(b);
    }
}

Output

true

See Also