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Java 8 Short Circuit operation Stream with Demo| Coding Interview Questions and Answers |Code Decode
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In this video of Code Decode we have covered Java 8 Short Circuit operation which is important in terms of Java 8 Interview questions for freshers and experienced candidates
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Course Description Video :
Java 8 short-circuiting operations are just like boolean short-circuit evaluations in Java.
In boolean short-circuiting logic, for example firstBoolean && secondBoolean, if firstBoolean is false then the remaining part of the expression is ignored (the operation is short-circuited) because the remaining evaluation will be redundant. Similarly in firstBoolean || secondBoolean, if firstBoolean is true the remaining part is short-circuited.
Java 8 Stream short-circuit operations are not limited to boolean types. There are pre defined short-circuiting operations.
Java 8 stream intermediate and terminal operations both can be short circuiting.
Intermediate - limit()
Terminal - findFirst(), findAny(), anyMatch(), allMatch(), noneMatch()
This method takes one (long N) as an argument and returns a stream of size no more than N
Stream limit(long N) - Where N is the number of elements the stream should be limited to and this function returns new stream as output.
As soon as limit() reaches the maximum number of items, it doesn't consume any more items and simply returns the resulting stream. Hence, we say that limit() is a short-circuiting operation.
limit() returns the first n elements in the encounter order and not just any n elements.
This is an intermediate operation.
This is a good choice when working with infinite streams or infinite values.
limit() method is invoked after calling the terminal operation such as count() or collect() methods.
This returns a stream of elements with the size or max limit given.
This works well in sequential streams. Not suggested using in the parallel streams such as larger or higher in size.
maxSize can not be negative. If negative then it will throw IllegalArgumentException.
Optional findFirst()
Returns the very first element (wrapped in Optional object) of this stream and before traversing the other.
The terminal operation terminated on finding the first element, hence short-circuited.
findAny()
Returns an Optional instance which wraps any and only one element of the stream.
The behavior of this operation is explicitly nondeterministic; it is free to select any element in the stream. This is to allow for maximal performance in parallel operations; the cost is that multiple invocations on the same source may not return the same result. (If a stable result is desired, use findFirst() instead.
For a sequential stream there won't be any difference between 'findFirst' and 'findAny'. But for a parallel stream findAny will return 'any' element rather than waiting for the 'first' element.
boolean anyMatch()
Tests whether any elements of this stream match the provided predicate. This terminal method will return as soon as it finds the match and will not transverse all the remaining elements to apply the predicate.
boolean allMatch()
Tests whether all elements match the provided predicate. It may return early with false result when any element doesn't match first.
boolean noneMatch()
Tests whether no elements of this stream match the provided predicate. It may return early with false result when any element matches the provided predicate first.
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Udemy Course of Code Decode on Microservice k8s AWS CICD link:
Course Description Video :
Java 8 short-circuiting operations are just like boolean short-circuit evaluations in Java.
In boolean short-circuiting logic, for example firstBoolean && secondBoolean, if firstBoolean is false then the remaining part of the expression is ignored (the operation is short-circuited) because the remaining evaluation will be redundant. Similarly in firstBoolean || secondBoolean, if firstBoolean is true the remaining part is short-circuited.
Java 8 Stream short-circuit operations are not limited to boolean types. There are pre defined short-circuiting operations.
Java 8 stream intermediate and terminal operations both can be short circuiting.
Intermediate - limit()
Terminal - findFirst(), findAny(), anyMatch(), allMatch(), noneMatch()
This method takes one (long N) as an argument and returns a stream of size no more than N
Stream limit(long N) - Where N is the number of elements the stream should be limited to and this function returns new stream as output.
As soon as limit() reaches the maximum number of items, it doesn't consume any more items and simply returns the resulting stream. Hence, we say that limit() is a short-circuiting operation.
limit() returns the first n elements in the encounter order and not just any n elements.
This is an intermediate operation.
This is a good choice when working with infinite streams or infinite values.
limit() method is invoked after calling the terminal operation such as count() or collect() methods.
This returns a stream of elements with the size or max limit given.
This works well in sequential streams. Not suggested using in the parallel streams such as larger or higher in size.
maxSize can not be negative. If negative then it will throw IllegalArgumentException.
Optional findFirst()
Returns the very first element (wrapped in Optional object) of this stream and before traversing the other.
The terminal operation terminated on finding the first element, hence short-circuited.
findAny()
Returns an Optional instance which wraps any and only one element of the stream.
The behavior of this operation is explicitly nondeterministic; it is free to select any element in the stream. This is to allow for maximal performance in parallel operations; the cost is that multiple invocations on the same source may not return the same result. (If a stable result is desired, use findFirst() instead.
For a sequential stream there won't be any difference between 'findFirst' and 'findAny'. But for a parallel stream findAny will return 'any' element rather than waiting for the 'first' element.
boolean anyMatch()
Tests whether any elements of this stream match the provided predicate. This terminal method will return as soon as it finds the match and will not transverse all the remaining elements to apply the predicate.
boolean allMatch()
Tests whether all elements match the provided predicate. It may return early with false result when any element doesn't match first.
boolean noneMatch()
Tests whether no elements of this stream match the provided predicate. It may return early with false result when any element matches the provided predicate first.
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