IntStream allMatch() in Java with examples
Last Updated :
06 Dec, 2018
IntStream allMatch(IntPredicate predicate) returns whether all 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 allMatch(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.
Note : If the stream is empty then true is returned and the predicate is not evaluated.
Example 1 : allMatch() function to check whether all elements are divisible by 3.
import java.util.*;
import java.util.stream.IntStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.of(3, 5, 9, 12, 14);
boolean answer = stream.allMatch(num -> num % 3 == 0);
System.out.println(answer);
}
}
|
Output :
false
Example 2 : allMatch() function to check whether all elements in the IntStream obtained after concatenating two IntStreams are less than 2.
import java.util.*;
import java.util.stream.IntStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.concat(IntStream.of(-2, -4, -6, -8),
IntStream.of(-1, 0, 1, 5));
boolean answer = stream.allMatch(num -> num < 2);
System.out.println(answer);
}
}
|
Output :
false
Example 3 : allMatch() function to show if the stream is empty then true is returned.
import java.util.*;
import java.util.stream.IntStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.empty();
boolean answer = stream.allMatch(num -> true);
System.out.println(answer);
}
}
|
Output :
true
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