LongStream allMatch() in Java with examples
Last Updated :
06 Dec, 2018
LongStream allMatch(LongPredicate 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(LongPredicate predicate)
Parameters :
- LongPredicate : A predicate (boolean-valued function) of one long-valued argument.
Return Value : 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.LongStream;
class GFG {
public static void main(String[] args)
{
LongStream stream = LongStream.of(3L, 5L, 9L, 12L, 14L);
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 LongStream obtained after concatenating two LongStreams are less than 2.
import java.util.*;
import java.util.stream.LongStream;
class GFG {
public static void main(String[] args)
{
LongStream stream =
LongStream.concat(LongStream.of(-2L, -4L, -6L, -8L),
LongStream.of(-1L, 0L, 1L, 5L));
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.LongStream;
class GFG {
public static void main(String[] args)
{
LongStream stream = LongStream.empty();
boolean answer = stream.allMatch(num -> true );
System.out.println(answer);
}
}
|
Output :
true
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